Merge https://gitlab.denx.de/u-boot/custodians/u-boot-x86

- DM ACPI support (Part A)
- Improve support for chain-loading x86 U-Boot

30 files changed, 983 insertions, 232 deletions

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index df9f1835c9..4bccfbe6e1 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -226,6 +226,10 @@
 		compatible = "denx,u-boot-acpi-test";
 	};
 
+	acpi-test2 {
+		compatible = "denx,u-boot-acpi-test";
+	};
+
 	clocks {
 		clk_fixed: clk-fixed {
 			compatible = "fixed-clock";
diff --git a/arch/sandbox/include/asm/global_data.h b/arch/sandbox/include/asm/global_data.h
index f4ce72d566..f95ddb058a 100644
--- a/arch/sandbox/include/asm/global_data.h
+++ b/arch/sandbox/include/asm/global_data.h
@@ -13,6 +13,7 @@
 struct arch_global_data {
 	uint8_t		*ram_buf;	/* emulated RAM buffer */
 	void		*text_base;	/* pointer to base of text region */
+	ulong acpi_start;		/* Start address of ACPI tables */
 };
 
 #include <asm-generic/global_data.h>
diff --git a/arch/x86/cpu/apollolake/fsp_s.c b/arch/x86/cpu/apollolake/fsp_s.c
index 17cf1682ad..7ef169b147 100644
--- a/arch/x86/cpu/apollolake/fsp_s.c
+++ b/arch/x86/cpu/apollolake/fsp_s.c
@@ -566,6 +566,8 @@ int arch_fsp_init_r(void)
 	struct udevice *dev, *itss;
 	int ret;
 
+	if (!ll_boot_init())
+		return 0;
 	/*
 	 * This must be called before any devices are probed. Put any probing
 	 * into arch_fsps_preinit() above.
diff --git a/arch/x86/cpu/coreboot/tables.c b/arch/x86/cpu/coreboot/tables.c
index 37e0424b5e..0f04c4f8e9 100644
--- a/arch/x86/cpu/coreboot/tables.c
+++ b/arch/x86/cpu/coreboot/tables.c
@@ -115,20 +115,11 @@ __weak void cb_parse_unhandled(u32 tag, unsigned char *ptr)
 
 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 {
+	unsigned char *ptr = addr;
 	struct cb_header *header;
-	unsigned char *ptr = (unsigned char *)addr;
 	int i;
 
-	for (i = 0; i < len; i += 16, ptr += 16) {
-		header = (struct cb_header *)ptr;
-		if (!strncmp((const char *)header->signature, "LBIO", 4))
-			break;
-	}
-
-	/* We walked the entire space and didn't find anything. */
-	if (i >= len)
-		return -1;
-
+	header = (struct cb_header *)ptr;
 	if (!header->table_bytes)
 		return 0;
 
@@ -231,10 +222,13 @@ static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 
 int get_coreboot_info(struct sysinfo_t *info)
 {
-	int ret = cb_parse_header((void *)0x00000000, 0x1000, info);
+	long addr;
+	int ret;
 
-	if (ret != 1)
-		ret = cb_parse_header((void *)0x000f0000, 0x1000, info);
+	addr = locate_coreboot_table();
+	if (addr < 0)
+		return addr;
+	ret = cb_parse_header((void *)addr, 0x1000, info);
 
-	return (ret == 1) ? 0 : -1;
+	return ret == 1 ? 0 : -ENOENT;
 }
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index cec04b481b..8526e856d7 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -239,8 +239,10 @@ int cpu_init_r(void)
 	struct udevice *dev;
 	int ret;
 
-	if (!ll_boot_init())
+	if (!ll_boot_init()) {
+		uclass_first_device(UCLASS_PCI, &dev);
 		return 0;
+	}
 
 	ret = x86_init_cpus();
 	if (ret)
diff --git a/arch/x86/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c
index c8da7f10e9..0312a26bbb 100644
--- a/arch/x86/cpu/i386/cpu.c
+++ b/arch/x86/cpu/i386/cpu.c
@@ -447,10 +447,37 @@ int x86_cpu_init_f(void)
 	return 0;
 }
 
+long detect_coreboot_table_at(ulong start, ulong size)
+{
+	u32 *ptr, *end;
+
+	size /= 4;
+	for (ptr = (void *)start, end = ptr + size; ptr < end; ptr += 4) {
+		if (*ptr == 0x4f49424c) /* "LBIO" */
+			return (long)ptr;
+	}
+
+	return -ENOENT;
+}
+
+long locate_coreboot_table(void)
+{
+	long addr;
+
+	/* We look for LBIO in the first 4K of RAM and again at 960KB */
+	addr = detect_coreboot_table_at(0x0, 0x1000);
+	if (addr < 0)
+		addr = detect_coreboot_table_at(0xf0000, 0x1000);
+
+	return addr;
+}
+
 int x86_cpu_reinit_f(void)
 {
 	setup_identity();
 	setup_pci_ram_top();
+	if (locate_coreboot_table() >= 0)
+		gd->flags |= GD_FLG_SKIP_LL_INIT;
 
 	return 0;
 }
diff --git a/arch/x86/cpu/i386/interrupt.c b/arch/x86/cpu/i386/interrupt.c
index 4c7e9ea215..e67a116ac1 100644
--- a/arch/x86/cpu/i386/interrupt.c
+++ b/arch/x86/cpu/i386/interrupt.c
@@ -264,6 +264,9 @@ int interrupt_init(void)
 	struct udevice *dev;
 	int ret;
 
+	if (!ll_boot_init())
+		return 0;
+
 	/* Try to set up the interrupt router, but don't require one */
 	ret = irq_first_device_type(X86_IRQT_BASE, &dev);
 	if (ret && ret != -ENODEV)
@@ -295,8 +298,7 @@ int interrupt_init(void)
 	 * TODO(sjg@chromium.org): But we don't handle these correctly when
 	 * booted from EFI.
 	 */
-	if (ll_boot_init())
-		enable_interrupts();
+	enable_interrupts();
 #endif
 
 	return 0;
diff --git a/arch/x86/cpu/start_from_spl.S b/arch/x86/cpu/start_from_spl.S
index 22cab2dd6c..905c825cdc 100644
--- a/arch/x86/cpu/start_from_spl.S
+++ b/arch/x86/cpu/start_from_spl.S
@@ -14,18 +14,30 @@
 .globl _start
 .type _start, @function
 _start:
-	/* Set up memory using the existing stack */
+	/*
+	 * If running from coreboot, CAR is no-longer available. Use the
+	 * existing stack, which is large enough.
+	 */
+	call	locate_coreboot_table
+	cmp	$0, %eax
+	jge	use_existing_stack
+
 	movl	$(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %eax
 #ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
 	subl	$CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %eax
 #endif
+	jmp	2f
 	/*
-	 * We don't subject CONFIG_DCACHE_RAM_MRC_VAR_SIZE since memory is
+	 * We don't subtract CONFIG_DCACHE_RAM_MRC_VAR_SIZE since memory is
 	 * already set up. This has the happy side-effect of putting gd in a
 	 * new place separate from SPL, so the memset() in
 	 * board_init_f_init_reserve() does not cause any problems (otherwise
 	 * it would zero out the gd and crash)
 	 */
+	/* Set up memory using the existing stack */
+use_existing_stack:
+	mov	%esp, %eax
+2:
 	call	board_init_f_alloc_reserve
 	mov	%eax, %esp
 
diff --git a/arch/x86/include/asm/coreboot_tables.h b/arch/x86/include/asm/coreboot_tables.h
index 61de0077d7..268284f43c 100644
--- a/arch/x86/include/asm/coreboot_tables.h
+++ b/arch/x86/include/asm/coreboot_tables.h
@@ -343,4 +343,11 @@ void *high_table_malloc(size_t bytes);
  */
 void write_coreboot_table(u32 addr, struct memory_area *cfg_tables);
 
+/**
+ * locate_coreboot_table() - Try to find coreboot tables at standard locations
+ *
+ * @return address of table that was found, or -ve error number
+ */
+long locate_coreboot_table(void);
+
 #endif
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index f4c1839104..4aee2f3e8c 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -123,6 +123,7 @@ struct arch_global_data {
 #ifdef CONFIG_FSP_VERSION2
 	struct fsp_header *fsp_s_hdr;	/* Pointer to FSP-S header */
 #endif
+	ulong acpi_start;		/* Start address of ACPI tables */
 };
 
 #endif
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 9346e165d8..13f1409de8 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -10,6 +10,7 @@
 #include <cpu.h>
 #include <dm.h>
 #include <dm/uclass-internal.h>
+#include <mapmem.h>
 #include <serial.h>
 #include <version.h>
 #include <acpi/acpi_table.h>
@@ -19,6 +20,7 @@
 #include <asm/mpspec.h>
 #include <asm/tables.h>
 #include <asm/arch/global_nvs.h>
+#include <dm/acpi.h>
 
 /*
  * IASL compiles the dsdt entries and writes the hex values
@@ -29,139 +31,6 @@ extern const unsigned char AmlCode[];
 /* ACPI RSDP address to be used in boot parameters */
 static ulong acpi_rsdp_addr;
 
-static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
-			    struct acpi_xsdt *xsdt)
-{
-	memset(rsdp, 0, sizeof(struct acpi_rsdp));
-
-	memcpy(rsdp->signature, RSDP_SIG, 8);
-	memcpy(rsdp->oem_id, OEM_ID, 6);
-
-	rsdp->length = sizeof(struct acpi_rsdp);
-	rsdp->rsdt_address = (u32)rsdt;
-
-	/*
-	 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
-	 *
-	 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
-	 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
-	 * revision 0)
-	 */
-	if (xsdt == NULL) {
-		rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
-	} else {
-		rsdp->xsdt_address = (u64)(u32)xsdt;
-		rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
-	}
-
-	/* Calculate checksums */
-	rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
-	rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
-			sizeof(struct acpi_rsdp));
-}
-
-void acpi_fill_header(struct acpi_table_header *header, char *signature)
-{
-	memcpy(header->signature, signature, 4);
-	memcpy(header->oem_id, OEM_ID, 6);
-	memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
-	header->oem_revision = U_BOOT_BUILD_DATE;
-	memcpy(header->aslc_id, ASLC_ID, 4);
-}
-
-static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
-{
-	struct acpi_table_header *header = &(rsdt->header);
-
-	/* Fill out header fields */
-	acpi_fill_header(header, "RSDT");
-	header->length = sizeof(struct acpi_rsdt);
-	header->revision = 1;
-
-	/* Entries are filled in later, we come with an empty set */
-
-	/* Fix checksum */
-	header->checksum = table_compute_checksum((void *)rsdt,
-			sizeof(struct acpi_rsdt));
-}
-
-static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
-{
-	struct acpi_table_header *header = &(xsdt->header);
-
-	/* Fill out header fields */
-	acpi_fill_header(header, "XSDT");
-	header->length = sizeof(struct acpi_xsdt);
-	header->revision = 1;
-
-	/* Entries are filled in later, we come with an empty set */
-
-	/* Fix checksum */
-	header->checksum = table_compute_checksum((void *)xsdt,
-			sizeof(struct acpi_xsdt));
-}
-
-/**
- * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
- * and checksum.
- */
-static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
-{
-	int i, entries_num;
-	struct acpi_rsdt *rsdt;
-	struct acpi_xsdt *xsdt;
-
-	/* The RSDT is mandatory while the XSDT is not */
-	rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
-
-	/* This should always be MAX_ACPI_TABLES */
-	entries_num = ARRAY_SIZE(rsdt->entry);
-
-	for (i = 0; i < entries_num; i++) {
-		if (rsdt->entry[i] == 0)
-			break;
-	}
-
-	if (i >= entries_num) {
-		debug("ACPI: Error: too many tables\n");
-		return;
-	}
-
-	/* Add table to the RSDT */
-	rsdt->entry[i] = (u32)table;
-
-	/* Fix RSDT length or the kernel will assume invalid entries */
-	rsdt->header.length = sizeof(struct acpi_table_header) +
-				sizeof(u32) * (i + 1);
-
-	/* Re-calculate checksum */
-	rsdt->header.checksum = 0;
-	rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
-			rsdt->header.length);
-
-	/* The RSDT is mandatory while the XSDT is not */
-	if (!rsdp->xsdt_address)
-		return;
-
-	/*
-	 * And now the same thing for the XSDT. We use the same index as for
-	 * now we want the XSDT and RSDT to always be in sync in U-Boot
-	 */
-	xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
-
-	/* Add table to the XSDT */
-	xsdt->entry[i] = (u64)(u32)table;
-
-	/* Fix XSDT length */
-	xsdt->header.length = sizeof(struct acpi_table_header) +
-				sizeof(u64) * (i + 1);
-
-	/* Re-calculate checksum */
-	xsdt->header.checksum = 0;
-	xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
-			xsdt->header.length);
-}
-
 static void acpi_create_facs(struct acpi_facs *facs)
 {
 	memset((void *)facs, 0, sizeof(struct acpi_facs));
@@ -487,12 +356,9 @@ static void acpi_create_spcr(struct acpi_spcr *spcr)
 /*
  * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
  */
-ulong write_acpi_tables(ulong start)
+ulong write_acpi_tables(ulong start_addr)
 {
-	u32 current;
-	struct acpi_rsdp *rsdp;
-	struct acpi_rsdt *rsdt;
-	struct acpi_xsdt *xsdt;
+	struct acpi_ctx sctx, *ctx = &sctx;
 	struct acpi_facs *facs;
 	struct acpi_table_header *dsdt;
 	struct acpi_fadt *fadt;
@@ -500,60 +366,39 @@ ulong write_acpi_tables(ulong start)
 	struct acpi_madt *madt;
 	struct acpi_csrt *csrt;
 	struct acpi_spcr *spcr;
+	void *start;
+	ulong addr;
 	int i;
 
-	current = start;
+	start = map_sysmem(start_addr, 0);
 
-	/* Align ACPI tables to 16 byte */
-	current = ALIGN(current, 16);
+	debug("ACPI: Writing ACPI tables at %lx\n", start_addr);
 
-	debug("ACPI: Writing ACPI tables at %lx\n", start);
-
-	/* We need at least an RSDP and an RSDT Table */
-	rsdp = (struct acpi_rsdp *)current;
-	current += sizeof(struct acpi_rsdp);
-	current = ALIGN(current, 16);
-	rsdt = (struct acpi_rsdt *)current;
-	current += sizeof(struct acpi_rsdt);
-	current = ALIGN(current, 16);
-	xsdt = (struct acpi_xsdt *)current;
-	current += sizeof(struct acpi_xsdt);
-	/*
-	 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
-	 * boundary (Windows checks this, but Linux does not).
-	 */
-	current = ALIGN(current, 64);
-
-	/* clear all table memory */
-	memset((void *)start, 0, current - start);
-
-	acpi_write_rsdp(rsdp, rsdt, xsdt);
-	acpi_write_rsdt(rsdt);
-	acpi_write_xsdt(xsdt);
+	acpi_setup_base_tables(ctx, start);
 
 	debug("ACPI:    * FACS\n");
-	facs = (struct acpi_facs *)current;
-	current += sizeof(struct acpi_facs);
-	current = ALIGN(current, 16);
+	facs = ctx->current;
+	acpi_inc_align(ctx, sizeof(struct acpi_facs));
 
 	acpi_create_facs(facs);
 
 	debug("ACPI:    * DSDT\n");
-	dsdt = (struct acpi_table_header *)current;
+	dsdt = ctx->current;
 	memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
-	current += sizeof(struct acpi_table_header);
-	memcpy((char *)current,
+	acpi_inc(ctx, sizeof(struct acpi_table_header));
+	memcpy(ctx->current,
 	       (char *)&AmlCode + sizeof(struct acpi_table_header),
 	       dsdt->length - sizeof(struct acpi_table_header));
-	current += dsdt->length - sizeof(struct acpi_table_header);
-	current = ALIGN(current, 16);
+	acpi_inc_align(ctx, dsdt->length - sizeof(struct acpi_table_header));
 
 	/* Pack GNVS into the ACPI table area */
 	for (i = 0; i < dsdt->length; i++) {
 		u32 *gnvs = (u32 *)((u32)dsdt + i);
 		if (*gnvs == ACPI_GNVS_ADDR) {
-			debug("Fix up global NVS in DSDT to 0x%08x\n", current);
-			*gnvs = current;
+			ulong addr = (ulong)map_to_sysmem(ctx->current);
+
+			debug("Fix up global NVS in DSDT to %#08lx\n", addr);
+			*gnvs = addr;
 			break;
 		}
 	}
@@ -563,51 +408,48 @@ ulong write_acpi_tables(ulong start)
 	dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
 
 	/* Fill in platform-specific global NVS variables */
-	acpi_create_gnvs((struct acpi_global_nvs *)current);
-	current += sizeof(struct acpi_global_nvs);
-	current = ALIGN(current, 16);
+	acpi_create_gnvs(ctx->current);
+	acpi_inc_align(ctx, sizeof(struct acpi_global_nvs));
 
 	debug("ACPI:    * FADT\n");
-	fadt = (struct acpi_fadt *)current;
-	current += sizeof(struct acpi_fadt);
-	current = ALIGN(current, 16);
+	fadt = ctx->current;
+	acpi_inc_align(ctx, sizeof(struct acpi_fadt));
 	acpi_create_fadt(fadt, facs, dsdt);
-	acpi_add_table(rsdp, fadt);
+	acpi_add_table(ctx, fadt);
 
 	debug("ACPI:    * MADT\n");
-	madt = (struct acpi_madt *)current;
+	madt = ctx->current;
 	acpi_create_madt(madt);
-	current += madt->header.length;
-	acpi_add_table(rsdp, madt);
-	current = ALIGN(current, 16);
+	acpi_inc_align(ctx, madt->header.length);
+	acpi_add_table(ctx, madt);
 
 	debug("ACPI:    * MCFG\n");
-	mcfg = (struct acpi_mcfg *)current;
+	mcfg = ctx->current;
 	acpi_create_mcfg(mcfg);
-	current += mcfg->header.length;
-	acpi_add_table(rsdp, mcfg);
-	current = ALIGN(current, 16);
+	acpi_inc_align(ctx, mcfg->header.length);
+	acpi_add_table(ctx, mcfg);
 
 	debug("ACPI:    * CSRT\n");
-	csrt = (struct acpi_csrt *)current;
+	csrt = ctx->current;
 	acpi_create_csrt(csrt);
-	current += csrt->header.length;
-	acpi_add_table(rsdp, csrt);
-	current = ALIGN(current, 16);
+	acpi_inc_align(ctx, csrt->header.length);
+	acpi_add_table(ctx, csrt);
 
 	debug("ACPI:    * SPCR\n");
-	spcr = (struct acpi_spcr *)current;
+	spcr = ctx->current;
 	acpi_create_spcr(spcr);
-	current += spcr->header.length;
-	acpi_add_table(rsdp, spcr);
-	current = ALIGN(current, 16);
+	acpi_inc_align(ctx, spcr->header.length);
+	acpi_add_table(ctx, spcr);
+
+	acpi_write_dev_tables(ctx);
 
-	debug("current = %x\n", current);
+	addr = map_to_sysmem(ctx->current);
+	debug("current = %lx\n", addr);
 
-	acpi_rsdp_addr = (unsigned long)rsdp;
+	acpi_rsdp_addr = (unsigned long)ctx->rsdp;
 	debug("ACPI: done\n");
 
-	return current;
+	return addr;
 }
 
 ulong acpi_get_rsdp_addr(void)
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 9ce0ddf0d3..15e82de2fe 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -44,6 +44,14 @@ int dram_init_banksize(void)
 	phys_addr_t low_end;
 	uint bank;
 
+	if (!ll_boot_init()) {
+		gd->bd->bi_dram[0].start = 0;
+		gd->bd->bi_dram[0].size = gd->ram_size;
+
+		mtrr_add_request(MTRR_TYPE_WRBACK, 0, gd->ram_size);
+		return 0;
+	}
+
 	low_end = 0;
 	for (bank = 1, hdr = gd->arch.hob_list;
 	     bank < CONFIG_NR_DRAM_BANKS && !end_of_hob(hdr);
diff --git a/arch/x86/lib/fsp/fsp_graphics.c b/arch/x86/lib/fsp/fsp_graphics.c
index 226c7e66b3..98b762209f 100644
--- a/arch/x86/lib/fsp/fsp_graphics.c
+++ b/arch/x86/lib/fsp/fsp_graphics.c
@@ -78,6 +78,9 @@ static int fsp_video_probe(struct udevice *dev)
 	struct vesa_mode_info *vesa = &mode_info.vesa;
 	int ret;
 
+	if (!ll_boot_init())
+		return 0;
+
 	printf("Video: ");
 
 	/* Initialize vesa_mode_info structure */
diff --git a/arch/x86/lib/fsp2/fsp_dram.c b/arch/x86/lib/fsp2/fsp_dram.c
index c8f2c09b6a..3869c53c5f 100644
--- a/arch/x86/lib/fsp2/fsp_dram.c
+++ b/arch/x86/lib/fsp2/fsp_dram.c
@@ -12,11 +12,18 @@
 #include <asm/fsp/fsp_support.h>
 #include <asm/fsp2/fsp_api.h>
 #include <asm/fsp2/fsp_internal.h>
+#include <linux/sizes.h>
 
 int dram_init(void)
 {
 	int ret;
 
+	if (!ll_boot_init()) {
+		/* Use a small and safe amount of 1GB */
+		gd->ram_size = SZ_1G;
+
+		return 0;
+	}
 	if (spl_phase() == PHASE_SPL) {
 #ifdef CONFIG_HAVE_ACPI_RESUME
 		bool s3wake = gd->arch.prev_sleep_state == ACPI_S3;
@@ -68,6 +75,9 @@ int dram_init(void)
 
 ulong board_get_usable_ram_top(ulong total_size)
 {
+	if (!ll_boot_init())
+		return gd->ram_size;
+
 #if CONFIG_IS_ENABLED(HANDOFF)
 	struct spl_handoff *ho = gd->spl_handoff;
 
diff --git a/arch/x86/lib/fsp2/fsp_init.c b/arch/x86/lib/fsp2/fsp_init.c
index da9bd6b45c..c7dc2ea257 100644
--- a/arch/x86/lib/fsp2/fsp_init.c
+++ b/arch/x86/lib/fsp2/fsp_init.c
@@ -23,7 +23,7 @@ int arch_cpu_init_dm(void)
 	int ret;
 
 	/* Make sure pads are set up early in U-Boot */
-	if (spl_phase() != PHASE_BOARD_F)
+	if (!ll_boot_init() || spl_phase() != PHASE_BOARD_F)
 		return 0;
 
 	/* Probe all pinctrl devices to set up the pads */
diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c
index 5bb55e256f..d906b528b3 100644
--- a/arch/x86/lib/init_helpers.c
+++ b/arch/x86/lib/init_helpers.c
@@ -30,6 +30,9 @@ int init_cache_f_r(void)
 			return ret;
 	}
 
+	if (!ll_boot_init())
+		return 0;
+
 	/* Initialise the CPU cache(s) */
 	return init_cache();
 }
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 6ce9e5521c..157a33081f 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -190,6 +190,20 @@ comment "Commands"
 
 menu "Info commands"
 
+config CMD_ACPI
+	bool "acpi"
+	default y if ACPIGEN
+	help
+	  List and dump ACPI tables. ACPI (Advanced Configuration and Power
+	  Interface) is used mostly on x86 for providing information to the
+	  Operating System about devices in the system. The tables are set up
+	  by the firmware, typically U-Boot but possibly an earlier firmware
+	  module, if U-Boot is chain-loaded from something else. ACPI tables
+	  can also include code, to perform hardware-specific tasks required
+	  by the Operating Systems. This allows some amount of separation
+	  between the firmware and OS, and is particularly useful when you
+	  want to make hardware changes without the OS needing to be adjusted.
+
 config CMD_BDI
 	bool "bdinfo"
 	default y
diff --git a/cmd/Makefile b/cmd/Makefile
index 6692ed96c6..974ad48b0a 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -11,6 +11,7 @@ obj-y += help.o
 obj-y += version.o
 
 # command
+obj-$(CONFIG_CMD_ACPI) += acpi.o
 obj-$(CONFIG_CMD_AES) += aes.o
 obj-$(CONFIG_CMD_AB_SELECT) += ab_select.o
 obj-$(CONFIG_CMD_ADC) += adc.o
diff --git a/cmd/acpi.c b/cmd/acpi.c
new file mode 100644
index 0000000000..203bd93bd5
--- /dev/null
+++ b/cmd/acpi.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+#include <common.h>
+#include <command.h>
+#include <mapmem.h>
+#include <acpi/acpi_table.h>
+#include <asm/acpi_table.h>
+#include <dm/acpi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * dump_hdr() - Dump an ACPI header
+ *
+ * If the header is for FACS then it shows the revision information as well
+ *
+ * @hdr: ACPI header to dump
+ */
+static void dump_hdr(struct acpi_table_header *hdr)
+{
+	bool has_hdr = memcmp(hdr->signature, "FACS", ACPI_NAME_LEN);
+
+	printf("%.*s %08lx %06x", ACPI_NAME_LEN, hdr->signature,
+	       (ulong)map_to_sysmem(hdr), hdr->length);
+	if (has_hdr) {
+		printf(" (v%02d %.6s %.8s %u %.4s %d)\n", hdr->revision,
+		       hdr->oem_id, hdr->oem_table_id, hdr->oem_revision,
+		       hdr->aslc_id, hdr->aslc_revision);
+	} else {
+		printf("\n");
+	}
+}
+
+/**
+ * find_table() - Look up an ACPI table
+ *
+ * @sig: Signature of table (4 characters, upper case)
+ * @return pointer to table header, or NULL if not found
+ */
+struct acpi_table_header *find_table(const char *sig)
+{
+	struct acpi_rsdp *rsdp;
+	struct acpi_rsdt *rsdt;
+	int len, i, count;
+
+	rsdp = map_sysmem(gd->arch.acpi_start, 0);
+	if (!rsdp)
+		return NULL;
+	rsdt = map_sysmem(rsdp->rsdt_address, 0);
+	len = rsdt->header.length - sizeof(rsdt->header);
+	count = len / sizeof(u32);
+	for (i = 0; i < count; i++) {
+		struct acpi_table_header *hdr;
+
+		hdr = map_sysmem(rsdt->entry[i], 0);
+		if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN))
+			return hdr;
+		if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {
+			struct acpi_fadt *fadt = (struct acpi_fadt *)hdr;
+
+			if (!memcmp(sig, "DSDT", ACPI_NAME_LEN) && fadt->dsdt)
+				return map_sysmem(fadt->dsdt, 0);
+			if (!memcmp(sig, "FACS", ACPI_NAME_LEN) &&
+			    fadt->firmware_ctrl)
+				return map_sysmem(fadt->firmware_ctrl, 0);
+		}
+	}
+
+	return NULL;
+}
+
+static int dump_table_name(const char *sig)
+{
+	struct acpi_table_header *hdr;
+
+	hdr = find_table(sig);
+	if (!hdr)
+		return -ENOENT;
+	printf("%.*s @ %08lx\n", ACPI_NAME_LEN, hdr->signature,
+	       (ulong)map_to_sysmem(hdr));
+	print_buffer(0, hdr, 1, hdr->length, 0);
+
+	return 0;
+}
+
+static void list_fadt(struct acpi_fadt *fadt)
+{
+	if (fadt->dsdt)
+		dump_hdr(map_sysmem(fadt->dsdt, 0));
+	if (fadt->firmware_ctrl)
+		dump_hdr(map_sysmem(fadt->firmware_ctrl, 0));
+}
+
+static int list_rsdt(struct acpi_rsdt *rsdt, struct acpi_xsdt *xsdt)
+{
+	int len, i, count;
+
+	dump_hdr(&rsdt->header);
+	if (xsdt)
+		dump_hdr(&xsdt->header);
+	len = rsdt->header.length - sizeof(rsdt->header);
+	count = len / sizeof(u32);
+	for (i = 0; i < count; i++) {
+		struct acpi_table_header *hdr;
+
+		if (!rsdt->entry[i])
+			break;
+		hdr = map_sysmem(rsdt->entry[i], 0);
+		dump_hdr(hdr);
+		if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN))
+			list_fadt((struct acpi_fadt *)hdr);
+		if (xsdt) {
+			if (xsdt->entry[i] != rsdt->entry[i]) {
+				printf("   (xsdt mismatch %llx)\n",
+				       xsdt->entry[i]);
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int list_rsdp(struct acpi_rsdp *rsdp)
+{
+	struct acpi_rsdt *rsdt;
+	struct acpi_xsdt *xsdt;
+
+	printf("RSDP %08lx %06x (v%02d %.6s)\n", (ulong)map_to_sysmem(rsdp),
+	       rsdp->length, rsdp->revision, rsdp->oem_id);
+	rsdt = map_sysmem(rsdp->rsdt_address, 0);
+	xsdt = map_sysmem(rsdp->xsdt_address, 0);
+	list_rsdt(rsdt, xsdt);
+
+	return 0;
+}
+
+static int do_acpi_list(cmd_tbl_t *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	struct acpi_rsdp *rsdp;
+
+	rsdp = map_sysmem(gd->arch.acpi_start, 0);
+	if (!rsdp) {
+		printf("No ACPI tables present\n");
+		return 0;
+	}
+	printf("ACPI tables start at %lx\n", gd->arch.acpi_start);
+	list_rsdp(rsdp);
+
+	return 0;
+}
+
+static int do_acpi_dump(cmd_tbl_t *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	const char *name;
+	char sig[ACPI_NAME_LEN];
+	int ret;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+	name = argv[1];
+	if (strlen(name) != ACPI_NAME_LEN) {
+		printf("Table name '%s' must be four characters\n", name);
+		return CMD_RET_FAILURE;
+	}
+	str_to_upper(name, sig, -1);
+	ret = dump_table_name(sig);
+	if (ret) {
+		printf("Table '%.*s' not found\n", ACPI_NAME_LEN, sig);
+		return CMD_RET_FAILURE;
+	}
+
+	return 0;
+}
+
+static char acpi_help_text[] =
+	"list - list ACPI tables\n"
+	"acpi dump <name> - Dump ACPI table";
+
+U_BOOT_CMD_WITH_SUBCMDS(acpi, "ACPI tables", acpi_help_text,
+	U_BOOT_SUBCMD_MKENT(list, 1, 1, do_acpi_list),
+	U_BOOT_SUBCMD_MKENT(dump, 2, 1, do_acpi_dump));
diff --git a/doc/arch/x86.rst b/doc/arch/x86.rst
index a441738ad1..c6b70ce61a 100644
--- a/doc/arch/x86.rst
+++ b/doc/arch/x86.rst
@@ -712,6 +712,34 @@ to load a 'u-boot-payload.efi', see below test logs on QEMU.
 See :doc:`../uefi/u-boot_on_efi` and :doc:`../uefi/uefi` for details of
 EFI support in U-Boot.
 
+Chain-loading
+-------------
+U-Boot can be chain-loaded from another bootloader, such as coreboot or
+Slim Bootloader. Typically this is done by building for targets 'coreboot' or
+'slimbootloader'.
+
+For example, at present we have a 'coreboot' target but this runs very
+different code from the bare-metal targets, such as coral. There is very little
+in common between them.
+
+It is useful to be able to boot the same U-Boot on a device, with or without a
+first-stage bootloader. For example, with chromebook_coral, it is helpful for
+testing to be able to boot the same U-Boot (complete with FSP) on bare metal
+and from coreboot. It allows checking of things like CPU speed, comparing
+registers, ACPI tables and the like.
+
+To do this you can use ll_boot_init() in appropriate places to skip init that
+has already been done by the previous stage. This works by setting a
+GD_FLG_NO_LL_INIT flag when U-Boot detects that it is running from another
+bootloader.
+
+With this feature, you can build a bare-metal target and boot it from
+coreboot, for example.
+
+Note that this is a development feature only. It is not intended for use in
+production environments. Also it is not currently part of the automated tests
+so may break in the future.
+
 TODO List
 ---------
 - Audio
diff --git a/doc/device-tree-bindings/device.txt b/doc/device-tree-bindings/device.txt
new file mode 100644
index 0000000000..27bd3978d9
--- /dev/null
+++ b/doc/device-tree-bindings/device.txt
@@ -0,0 +1,36 @@
+Devices
+=======
+
+Device bindings are described by their own individual binding files.
+
+U-Boot provides for some optional properties which are documented here. See
+also hid-over-i2c.txt which describes HID devices. See also
+Documentation/firmware-guide/acpi/enumeration.rst in the Linux kernel for
+the acpi,compatible property.
+
+ - acpi,has-power-resource : (boolean) true if this device has a power resource.
+    This causes an ACPI PowerResource to be written containing the properties
+    provided by this binding, to describe how to handle powering the device up
+    and down using GPIOs
+ - acpi,compatible : compatible string to report
+ - acpi,ddn : Contains the string to use as the _DDN (DOS (Disk Operating
+    System) Device Name)
+ - acpi,hid : Contains the string to use as the HID (Hardware ID)
+    identifier _HID
+ - acpi,uid : _UID value for device
+ - linux,probed : Tells U-Boot to add 'linux,probed' to the ACPI tables so that
+    Linux will only load the driver if the device can be detected (e.g. on I2C
+    bus). Note that this is an out-of-tree Linux feature.
+
+
+Example
+-------
+
+elan_touchscreen: elan-touchscreen@10 {
+	compatible = "i2c-chip";
+	reg = <0x10>;
+	acpi,hid = "ELAN0001";
+	acpi,ddn = "ELAN Touchscreen";
+	interrupts-extended = <&acpi_gpe GPIO_21_IRQ IRQ_TYPE_EDGE_FALLING>;
+	linux,probed;
+};
diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c
index ba50d688fe..e09905cf2a 100644
--- a/drivers/core/acpi.c
+++ b/drivers/core/acpi.c
@@ -11,8 +11,17 @@
 #include <common.h>
 #include <dm.h>
 #include <dm/acpi.h>
+#include <dm/device-internal.h>
 #include <dm/root.h>
 
+/* Type of method to call */
+enum method_t {
+	METHOD_WRITE_TABLES,
+};
+
+/* Prototype for all methods */
+typedef int (*acpi_method)(const struct udevice *dev, struct acpi_ctx *ctx);
+
 int acpi_copy_name(char *out_name, const char *name)
 {
 	strncpy(out_name, name, ACPI_NAME_LEN);
@@ -31,3 +40,56 @@ int acpi_get_name(const struct udevice *dev, char *out_name)
 
 	return -ENOSYS;
 }
+
+acpi_method acpi_get_method(struct udevice *dev, enum method_t method)
+{
+	struct acpi_ops *aops;
+
+	aops = device_get_acpi_ops(dev);
+	if (aops) {
+		switch (method) {
+		case METHOD_WRITE_TABLES:
+			return aops->write_tables;
+		}
+	}
+
+	return NULL;
+}
+
+int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
+			enum method_t method)
+{
+	struct udevice *dev;
+	acpi_method func;
+	int ret;
+
+	func = acpi_get_method(parent, method);
+	if (func) {
+		log_debug("\n");
+		log_debug("- %s %p\n", parent->name, func);
+		ret = device_ofdata_to_platdata(parent);
+		if (ret)
+			return log_msg_ret("ofdata", ret);
+		ret = func(parent, ctx);
+		if (ret)
+			return log_msg_ret("func", ret);
+	}
+	device_foreach_child(dev, parent) {
+		ret = acpi_recurse_method(ctx, dev, method);
+		if (ret)
+			return log_msg_ret("recurse", ret);
+	}
+
+	return 0;
+}
+
+int acpi_write_dev_tables(struct acpi_ctx *ctx)
+{
+	int ret;
+
+	log_debug("Writing device tables\n");
+	ret = acpi_recurse_method(ctx, dm_root(), METHOD_WRITE_TABLES);
+	log_debug("Writing finished, err=%d\n", ret);
+
+	return ret;
+}
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index d2e10d6868..7f46e901fb 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1009,7 +1009,7 @@ static int pci_uclass_post_probe(struct udevice *bus)
 	if (ret)
 		return ret;
 
-	if (CONFIG_IS_ENABLED(PCI_PNP) &&
+	if (CONFIG_IS_ENABLED(PCI_PNP) && ll_boot_init() &&
 	    (!hose->skip_auto_config_until_reloc ||
 	     (gd->flags & GD_FLG_RELOC))) {
 		ret = pci_auto_config_devices(bus);
@@ -1031,7 +1031,7 @@ static int pci_uclass_post_probe(struct udevice *bus)
 	 * Note we only call this 1) after U-Boot is relocated, and 2)
 	 * root bus has finished probing.
 	 */
-	if ((gd->flags & GD_FLG_RELOC) && (bus->seq == 0)) {
+	if ((gd->flags & GD_FLG_RELOC) && bus->seq == 0 && ll_boot_init()) {
 		ret = fsp_init_phase_pci();
 		if (ret)
 			return ret;
diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h
index 194be9aa58..3681c5c8ed 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -23,6 +23,8 @@
 
 #if !defined(__ACPI__)
 
+struct acpi_ctx;
+
 /*
  * RSDP (Root System Description Pointer)
  * Note: ACPI 1.0 didn't have length, xsdt_address, and ext_checksum
@@ -505,6 +507,69 @@ int acpi_get_table_revision(enum acpi_tables table);
  */
 int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags);
 
+/**
+ * acpi_fill_header() - Set up a new table header
+ *
+ * This sets all fields except length, revision, checksum and aslc_revision
+ *
+ * @header: ACPI header to update
+ * @signature: Table signature to use (4 characters)
+ */
+void acpi_fill_header(struct acpi_table_header *header, char *signature);
+
+/**
+ * acpi_align() - Align the ACPI output pointer to a 16-byte boundary
+ *
+ * @ctx: ACPI context
+ */
+void acpi_align(struct acpi_ctx *ctx);
+
+/**
+ * acpi_align64() - Align the ACPI output pointer to a 64-byte boundary
+ *
+ * @ctx: ACPI context
+ */
+void acpi_align64(struct acpi_ctx *ctx);
+
+/**
+ * acpi_inc() - Increment the ACPI output pointer by a bit
+ *
+ * The pointer is NOT aligned afterwards.
+ *
+ * @ctx: ACPI context
+ * @amount: Amount to increment by
+ */
+void acpi_inc(struct acpi_ctx *ctx, uint amount);
+
+/**
+ * acpi_inc_align() - Increment the ACPI output pointer by a bit and align
+ *
+ * The pointer is aligned afterwards to a 16-byte boundary
+ *
+ * @ctx: ACPI context
+ * @amount: Amount to increment by
+ */
+void acpi_inc_align(struct acpi_ctx *ctx, uint amount);
+
+/**
+ * acpi_add_table() - Add a new table to the RSDP and XSDT
+ *
+ * @ctx: ACPI context
+ * @table: Table to add
+ * @return 0 if OK, -E2BIG if too many tables
+ */
+int acpi_add_table(struct acpi_ctx *ctx, void *table);
+
+/**
+ * acpi_setup_base_tables() - Set up context along with RSDP, RSDT and XSDT
+ *
+ * Set up the context with the given start position. Some basic tables are
+ * always needed, so set them up as well.
+ *
+ * @ctx: Context to set up
+ */
+void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start);
+
 #endif /* !__ACPI__*/
 
 #include <asm/acpi_table.h>
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index d9e220cfe3..8c78792cc9 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -166,5 +166,6 @@ typedef struct global_data {
 #define GD_FLG_SPL_EARLY_INIT	0x04000 /* Early SPL init is done	   */
 #define GD_FLG_LOG_READY	0x08000 /* Log system is ready for use	   */
 #define GD_FLG_WDT_READY	0x10000 /* Watchdog is ready for use	   */
+#define GD_FLG_SKIP_LL_INIT	0x20000	/* Don't perform low-level init	   */
 
 #endif /* __ASM_GENERIC_GBL_DATA_H */
diff --git a/include/cbfs.h b/include/cbfs.h
index f3bc8ca24a..d915f9426d 100644
--- a/include/cbfs.h
+++ b/include/cbfs.h
@@ -135,7 +135,7 @@ void file_cbfs_get_next(const struct cbfs_cachenode **file);
  */
 const struct cbfs_cachenode *file_cbfs_find(const char *name);
 
-struct cbfs_priv *priv;
+struct cbfs_priv;
 
 /**
  * cbfs_find_file() - Find a file in a given CBFS
diff --git a/include/dm/acpi.h b/include/dm/acpi.h
index 49257914ff..7563a4c60a 100644
--- a/include/dm/acpi.h
+++ b/include/dm/acpi.h
@@ -25,6 +25,24 @@
 #if !defined(__ACPI__)
 
 /**
+ * struct acpi_ctx - Context used for writing ACPI tables
+ *
+ * This contains a few useful pieces of information used when writing
+ *
+ * @current: Current address for writing
+ * @rsdp: Pointer to the Root System Description Pointer, typically used when
+ *	adding a new table. The RSDP holds pointers to the RSDT and XSDT.
+ * @rsdt: Pointer to the Root System Description Table
+ * @xsdt: Pointer to the Extended System Description Table
+ */
+struct acpi_ctx {
+	void *current;
+	struct acpi_rsdp *rsdp;
+	struct acpi_rsdt *rsdt;
+	struct acpi_xsdt *xsdt;
+};
+
+/**
  * struct acpi_ops - ACPI operations supported by driver model
  */
 struct acpi_ops {
@@ -38,6 +56,15 @@ struct acpi_ops {
 	 *	other error
 	 */
 	int (*get_name)(const struct udevice *dev, char *out_name);
+
+	/**
+	 * write_tables() - Write out any tables required by this device
+	 *
+	 * @dev: Device to write
+	 * @ctx: ACPI context to use
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx);
 };
 
 #define device_get_acpi_ops(dev)	((dev)->driver->acpi_ops)
@@ -72,6 +99,16 @@ int acpi_get_name(const struct udevice *dev, char *out_name);
  */
 int acpi_copy_name(char *out_name, const char *name);
 
+/**
+ * acpi_write_dev_tables() - Write ACPI tables required by devices
+ *
+ * This scans through all devices and tells them to write any tables they want
+ * to write.
+ *
+ * @return 0 if OK, -ve if any device returned an error
+ */
+int acpi_write_dev_tables(struct acpi_ctx *ctx);
+
 #endif /* __ACPI__ */
 
 #endif
diff --git a/include/init.h b/include/init.h
index 9ef88c966b..b5a167b6ed 100644
--- a/include/init.h
+++ b/include/init.h
@@ -20,7 +20,7 @@ struct global_data;
 #ifdef CONFIG_EFI_STUB
 #define ll_boot_init()	false
 #else
-#define ll_boot_init()	true
+#define ll_boot_init()	(!(gd->flags & GD_FLG_SKIP_LL_INIT))
 #endif
 
 /*
diff --git a/lib/acpi/acpi_table.c b/lib/acpi/acpi_table.c
index 4633dcb948..1c253af3bf 100644
--- a/lib/acpi/acpi_table.c
+++ b/lib/acpi/acpi_table.c
@@ -6,12 +6,14 @@
  */
 
 #include <common.h>
-#include <acpi/acpi_table.h>
 #include <dm.h>
 #include <cpu.h>
+#include <mapmem.h>
+#include <tables_csum.h>
+#include <version.h>
+#include <acpi/acpi_table.h>
+#include <dm/acpi.h>
 
-/* Temporary change to ensure bisectability */
-#ifndef CONFIG_SANDBOX
 int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
 {
 	struct acpi_table_header *header = &dmar->header;
@@ -37,7 +39,6 @@ int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
 
 	return 0;
 }
-#endif
 
 int acpi_get_table_revision(enum acpi_tables table)
 {
@@ -91,3 +92,173 @@ int acpi_get_table_revision(enum acpi_tables table)
 		return -EINVAL;
 	}
 }
+
+void acpi_fill_header(struct acpi_table_header *header, char *signature)
+{
+	memcpy(header->signature, signature, 4);
+	memcpy(header->oem_id, OEM_ID, 6);
+	memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
+	header->oem_revision = U_BOOT_BUILD_DATE;
+	memcpy(header->aslc_id, ASLC_ID, 4);
+}
+
+void acpi_align(struct acpi_ctx *ctx)
+{
+	ctx->current = (void *)ALIGN((ulong)ctx->current, 16);
+}
+
+void acpi_align64(struct acpi_ctx *ctx)
+{
+	ctx->current = (void *)ALIGN((ulong)ctx->current, 64);
+}
+
+void acpi_inc(struct acpi_ctx *ctx, uint amount)
+{
+	ctx->current += amount;
+}
+
+void acpi_inc_align(struct acpi_ctx *ctx, uint amount)
+{
+	ctx->current += amount;
+	acpi_align(ctx);
+}
+
+/**
+ * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
+ * and checksum.
+ */
+int acpi_add_table(struct acpi_ctx *ctx, void *table)
+{
+	int i, entries_num;
+	struct acpi_rsdt *rsdt;
+	struct acpi_xsdt *xsdt;
+
+	/* The RSDT is mandatory while the XSDT is not */
+	rsdt = ctx->rsdt;
+
+	/* This should always be MAX_ACPI_TABLES */
+	entries_num = ARRAY_SIZE(rsdt->entry);
+
+	for (i = 0; i < entries_num; i++) {
+		if (rsdt->entry[i] == 0)
+			break;
+	}
+
+	if (i >= entries_num) {
+		log_err("ACPI: Error: too many tables\n");
+		return -E2BIG;
+	}
+
+	/* Add table to the RSDT */
+	rsdt->entry[i] = map_to_sysmem(table);
+
+	/* Fix RSDT length or the kernel will assume invalid entries */
+	rsdt->header.length = sizeof(struct acpi_table_header) +
+				(sizeof(u32) * (i + 1));
+
+	/* Re-calculate checksum */
+	rsdt->header.checksum = 0;
+	rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
+						       rsdt->header.length);
+
+	/*
+	 * And now the same thing for the XSDT. We use the same index as for
+	 * now we want the XSDT and RSDT to always be in sync in U-Boot
+	 */
+	xsdt = ctx->xsdt;
+
+	/* Add table to the XSDT */
+	xsdt->entry[i] = map_to_sysmem(table);
+
+	/* Fix XSDT length */
+	xsdt->header.length = sizeof(struct acpi_table_header) +
+				(sizeof(u64) * (i + 1));
+
+	/* Re-calculate checksum */
+	xsdt->header.checksum = 0;
+	xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
+						       xsdt->header.length);
+
+	return 0;
+}
+
+static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
+			    struct acpi_xsdt *xsdt)
+{
+	memset(rsdp, 0, sizeof(struct acpi_rsdp));
+
+	memcpy(rsdp->signature, RSDP_SIG, 8);
+	memcpy(rsdp->oem_id, OEM_ID, 6);
+
+	rsdp->length = sizeof(struct acpi_rsdp);
+	rsdp->rsdt_address = map_to_sysmem(rsdt);
+
+	rsdp->xsdt_address = map_to_sysmem(xsdt);
+	rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
+
+	/* Calculate checksums */
+	rsdp->checksum = table_compute_checksum(rsdp, 20);
+	rsdp->ext_checksum = table_compute_checksum(rsdp,
+						    sizeof(struct acpi_rsdp));
+}
+
+static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
+{
+	struct acpi_table_header *header = &rsdt->header;
+
+	/* Fill out header fields */
+	acpi_fill_header(header, "RSDT");
+	header->length = sizeof(struct acpi_rsdt);
+	header->revision = 1;
+
+	/* Entries are filled in later, we come with an empty set */
+
+	/* Fix checksum */
+	header->checksum = table_compute_checksum(rsdt,
+						  sizeof(struct acpi_rsdt));
+}
+
+static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
+{
+	struct acpi_table_header *header = &xsdt->header;
+
+	/* Fill out header fields */
+	acpi_fill_header(header, "XSDT");
+	header->length = sizeof(struct acpi_xsdt);
+	header->revision = 1;
+
+	/* Entries are filled in later, we come with an empty set */
+
+	/* Fix checksum */
+	header->checksum = table_compute_checksum(xsdt,
+						  sizeof(struct acpi_xsdt));
+}
+
+void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
+{
+	ctx->current = start;
+
+	/* Align ACPI tables to 16 byte */
+	acpi_align(ctx);
+	gd->arch.acpi_start = map_to_sysmem(ctx->current);
+
+	/* We need at least an RSDP and an RSDT Table */
+	ctx->rsdp = ctx->current;
+	acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
+	ctx->rsdt = ctx->current;
+	acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
+	ctx->xsdt = ctx->current;
+	acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
+
+	/* clear all table memory */
+	memset((void *)start, '\0', ctx->current - start);
+
+	acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
+	acpi_write_rsdt(ctx->rsdt);
+	acpi_write_xsdt(ctx->xsdt);
+	/*
+	 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
+	 * boundary (Windows checks this, but Linux does not).
+	 */
+	acpi_align64(ctx);
+}
diff --git a/test/dm/acpi.c b/test/dm/acpi.c
index e7b8abd556..176d207a55 100644
--- a/test/dm/acpi.c
+++ b/test/dm/acpi.c
@@ -7,13 +7,36 @@
  */
 
 #include <common.h>
+#include <console.h>
 #include <dm.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <version.h>
+#include <tables_csum.h>
+#include <version.h>
 #include <acpi/acpi_table.h>
 #include <dm/acpi.h>
 #include <dm/test.h>
 #include <test/ut.h>
 
 #define ACPI_TEST_DEV_NAME	"ABCD"
+#define BUF_SIZE		4096
+
+static int testacpi_write_tables(const struct udevice *dev,
+				 struct acpi_ctx *ctx)
+{
+	struct acpi_dmar *dmar;
+	int ret;
+
+	dmar = (struct acpi_dmar *)ctx->current;
+	acpi_create_dmar(dmar, DMAR_INTR_REMAP);
+	ctx->current += sizeof(struct acpi_dmar);
+	ret = acpi_add_table(ctx, dmar);
+	if (ret)
+		return log_msg_ret("add", ret);
+
+	return 0;
+}
 
 static int testacpi_get_name(const struct udevice *dev, char *out_name)
 {
@@ -22,6 +45,7 @@ static int testacpi_get_name(const struct udevice *dev, char *out_name)
 
 struct acpi_ops testacpi_ops = {
 	.get_name	= testacpi_get_name,
+	.write_tables	= testacpi_write_tables,
 };
 
 static const struct udevice_id testacpi_ids[] = {
@@ -68,8 +92,6 @@ static int dm_test_acpi_get_table_revision(struct unit_test_state *uts)
 DM_TEST(dm_test_acpi_get_table_revision,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
 
-/* Temporary change to ensure bisectability */
-#ifndef CONFIG_SANDBOX
 /* Test acpi_create_dmar() */
 static int dm_test_acpi_create_dmar(struct unit_test_state *uts)
 {
@@ -82,4 +104,214 @@ static int dm_test_acpi_create_dmar(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_acpi_create_dmar, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
-#endif
+
+/* Test acpi_fill_header() */
+static int dm_test_acpi_fill_header(struct unit_test_state *uts)
+{
+	struct acpi_table_header hdr;
+
+	/* Make sure these 5 fields are not changed */
+	hdr.length = 0x11;
+	hdr.revision = 0x22;
+	hdr.checksum = 0x33;
+	hdr.aslc_revision = 0x44;
+	acpi_fill_header(&hdr, "ABCD");
+
+	ut_asserteq_mem("ABCD", hdr.signature, sizeof(hdr.signature));
+	ut_asserteq(0x11, hdr.length);
+	ut_asserteq(0x22, hdr.revision);
+	ut_asserteq(0x33, hdr.checksum);
+	ut_asserteq_mem(OEM_ID, hdr.oem_id, sizeof(hdr.oem_id));
+	ut_asserteq_mem(OEM_TABLE_ID, hdr.oem_table_id,
+			sizeof(hdr.oem_table_id));
+	ut_asserteq(U_BOOT_BUILD_DATE, hdr.oem_revision);
+	ut_asserteq_mem(ASLC_ID, hdr.aslc_id, sizeof(hdr.aslc_id));
+	ut_asserteq(0x44, hdr.aslc_revision);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_fill_header, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test ACPI write_tables() */
+static int dm_test_acpi_write_tables(struct unit_test_state *uts)
+{
+	struct acpi_dmar *dmar;
+	struct acpi_ctx ctx;
+	void *buf;
+
+	buf = malloc(BUF_SIZE);
+	ut_assertnonnull(buf);
+
+	acpi_setup_base_tables(&ctx, buf);
+	dmar = ctx.current;
+	ut_assertok(acpi_write_dev_tables(&ctx));
+
+	/*
+	 * We should have two dmar tables, one for each "denx,u-boot-acpi-test"
+	 * device
+	 */
+	ut_asserteq_ptr(dmar + 2, ctx.current);
+	ut_asserteq(DMAR_INTR_REMAP, dmar->flags);
+	ut_asserteq(32 - 1, dmar->host_address_width);
+
+	ut_asserteq(DMAR_INTR_REMAP, dmar[1].flags);
+	ut_asserteq(32 - 1, dmar[1].host_address_width);
+
+	/* Check that the pointers were added correctly */
+	ut_asserteq(map_to_sysmem(dmar), ctx.rsdt->entry[0]);
+	ut_asserteq(map_to_sysmem(dmar + 1), ctx.rsdt->entry[1]);
+	ut_asserteq(0, ctx.rsdt->entry[2]);
+
+	ut_asserteq(map_to_sysmem(dmar), ctx.xsdt->entry[0]);
+	ut_asserteq(map_to_sysmem(dmar + 1), ctx.xsdt->entry[1]);
+	ut_asserteq(0, ctx.xsdt->entry[2]);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_tables, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test basic ACPI functions */
+static int dm_test_acpi_basic(struct unit_test_state *uts)
+{
+	struct acpi_ctx ctx;
+
+	/* Check align works */
+	ctx.current = (void *)5;
+	acpi_align(&ctx);
+	ut_asserteq_ptr((void *)16, ctx.current);
+
+	/* Check that align does nothing if already aligned */
+	acpi_align(&ctx);
+	ut_asserteq_ptr((void *)16, ctx.current);
+	acpi_align64(&ctx);
+	ut_asserteq_ptr((void *)64, ctx.current);
+	acpi_align64(&ctx);
+	ut_asserteq_ptr((void *)64, ctx.current);
+
+	/* Check incrementing */
+	acpi_inc(&ctx, 3);
+	ut_asserteq_ptr((void *)67, ctx.current);
+	acpi_inc_align(&ctx, 3);
+	ut_asserteq_ptr((void *)80, ctx.current);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_basic, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test acpi_setup_base_tables */
+static int dm_test_acpi_setup_base_tables(struct unit_test_state *uts)
+{
+	struct acpi_rsdp *rsdp;
+	struct acpi_rsdt *rsdt;
+	struct acpi_xsdt *xsdt;
+	struct acpi_ctx ctx;
+	void *buf, *end;
+
+	/*
+	 * Use an unaligned address deliberately, by allocating an aligned
+	 * address and then adding 4 to it
+	 */
+	buf = memalign(64, BUF_SIZE);
+	ut_assertnonnull(buf);
+	acpi_setup_base_tables(&ctx, buf + 4);
+	ut_asserteq(map_to_sysmem(PTR_ALIGN(buf + 4, 16)), gd->arch.acpi_start);
+
+	rsdp = buf + 16;
+	ut_asserteq_ptr(rsdp, ctx.rsdp);
+	ut_assertok(memcmp(RSDP_SIG, rsdp->signature, sizeof(rsdp->signature)));
+	ut_asserteq(sizeof(*rsdp), rsdp->length);
+	ut_assertok(table_compute_checksum(rsdp, 20));
+	ut_assertok(table_compute_checksum(rsdp, sizeof(*rsdp)));
+
+	rsdt = PTR_ALIGN((void *)rsdp + sizeof(*rsdp), 16);
+	ut_asserteq_ptr(rsdt, ctx.rsdt);
+	ut_assertok(memcmp("RSDT", rsdt->header.signature, ACPI_NAME_LEN));
+	ut_asserteq(sizeof(*rsdt), rsdt->header.length);
+	ut_assertok(table_compute_checksum(rsdt, sizeof(*rsdt)));
+
+	xsdt = PTR_ALIGN((void *)rsdt + sizeof(*rsdt), 16);
+	ut_asserteq_ptr(xsdt, ctx.xsdt);
+	ut_assertok(memcmp("XSDT", xsdt->header.signature, ACPI_NAME_LEN));
+	ut_asserteq(sizeof(*xsdt), xsdt->header.length);
+	ut_assertok(table_compute_checksum(xsdt, sizeof(*xsdt)));
+
+	end = PTR_ALIGN((void *)xsdt + sizeof(*xsdt), 64);
+	ut_asserteq_ptr(end, ctx.current);
+
+	ut_asserteq(map_to_sysmem(rsdt), rsdp->rsdt_address);
+	ut_asserteq(map_to_sysmem(xsdt), rsdp->xsdt_address);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_setup_base_tables,
+	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test 'acpi list' command */
+static int dm_test_acpi_cmd_list(struct unit_test_state *uts)
+{
+	struct acpi_ctx ctx;
+	ulong addr;
+	void *buf;
+
+	buf = memalign(16, BUF_SIZE);
+	ut_assertnonnull(buf);
+	acpi_setup_base_tables(&ctx, buf);
+
+	ut_assertok(acpi_write_dev_tables(&ctx));
+
+	console_record_reset();
+	run_command("acpi list", 0);
+	addr = (ulong)map_to_sysmem(buf);
+	ut_assert_nextline("ACPI tables start at %lx", addr);
+	ut_assert_nextline("RSDP %08lx %06lx (v02 U-BOOT)", addr,
+			   sizeof(struct acpi_rsdp));
+	addr = ALIGN(addr + sizeof(struct acpi_rsdp), 16);
+	ut_assert_nextline("RSDT %08lx %06lx (v01 U-BOOT U-BOOTBL %u INTL 0)",
+			   addr, sizeof(struct acpi_table_header) +
+			   2 * sizeof(u32), U_BOOT_BUILD_DATE);
+	addr = ALIGN(addr + sizeof(struct acpi_rsdt), 16);
+	ut_assert_nextline("XSDT %08lx %06lx (v01 U-BOOT U-BOOTBL %u INTL 0)",
+			   addr, sizeof(struct acpi_table_header) +
+			   2 * sizeof(u64), U_BOOT_BUILD_DATE);
+	addr = ALIGN(addr + sizeof(struct acpi_xsdt), 64);
+	ut_assert_nextline("DMAR %08lx %06lx (v01 U-BOOT U-BOOTBL %u INTL 0)",
+			   addr, sizeof(struct acpi_dmar), U_BOOT_BUILD_DATE);
+	addr = ALIGN(addr + sizeof(struct acpi_dmar), 16);
+	ut_assert_nextline("DMAR %08lx %06lx (v01 U-BOOT U-BOOTBL %u INTL 0)",
+			   addr, sizeof(struct acpi_dmar), U_BOOT_BUILD_DATE);
+	ut_assert_console_end();
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_cmd_list, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test 'acpi dump' command */
+static int dm_test_acpi_cmd_dump(struct unit_test_state *uts)
+{
+	struct acpi_ctx ctx;
+	ulong addr;
+	void *buf;
+
+	buf = memalign(16, BUF_SIZE);
+	ut_assertnonnull(buf);
+	acpi_setup_base_tables(&ctx, buf);
+
+	ut_assertok(acpi_write_dev_tables(&ctx));
+
+	/* First search for a non-existent table */
+	console_record_reset();
+	run_command("acpi dump rdst", 0);
+	ut_assert_nextline("Table 'RDST' not found");
+	ut_assert_console_end();
+
+	/* Now a real table */
+	console_record_reset();
+	run_command("acpi dump dmar", 0);
+	addr = ALIGN(map_to_sysmem(ctx.xsdt) + sizeof(struct acpi_xsdt), 64);
+	ut_assert_nextline("DMAR @ %08lx", addr);
+	ut_assert_nextlines_are_dump(0x30);
+	ut_assert_console_end();
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_cmd_dump, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);