Merge branch '2022-10-31-vbe-implement-the-full-firmware-flow'

To quote Simon:
This series provides an implementation of VBE from TPL through to U-Boot
proper, using VBE to load the relevant firmware stages. It buils a single
image.bin file containing all the phases:

   TPL - initial phase, loads VPL using binman symbols
   VPL - main firmware phase, loads SPL using VBE parameters
   SPL - loads U-Boot proper using VBE parameters
   U-Boot - final firmware phase, where OS booting is processed

This series does not include the OS-booting phase. That will be the
subject of a future series.

The implementation is entirely handled by sandbox. It should be possible
to enable this on a real board without much effort, but that is also the
subject of a future series.

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/sandbox/cpu/start.c b/arch/sandbox/cpu/start.c
index 642be164a3..622df41f54 100644
--- a/arch/sandbox/cpu/start.c
+++ b/arch/sandbox/cpu/start.c
@@ -244,6 +244,36 @@ static int sandbox_cmdline_cb_jump(struct sandbox_state *state,
 }
 SANDBOX_CMDLINE_OPT_SHORT(jump, 'j', 1, "Jumped from previous U-Boot");
 
+static int sandbox_cmdline_cb_program(struct sandbox_state *state,
+				      const char *arg)
+{
+	/*
+	 * Record the program name to use when jumping to future phases. This
+	 * is the original executable which holds all the phases. We need to
+	 * use this instead of argv[0] since each phase is started by
+	 * extracting a particular binary from the full program, then running
+	 * it. Therefore in that binary, argv[0] contains only the
+	 * current-phase executable.
+	 *
+	 * For example, sandbox TPL may be started using image file:
+	 *
+	 *     ./image.bin
+	 *
+	 * but then TPL needs to run VPL, which it does by extracting the VPL
+	 * image from the image.bin file.
+	 *
+	 *    ./temp-vpl
+	 *
+	 * When VPL runs it needs access to the original image.bin so it can
+	 * extract the next phase (SPL). This works if we use '-f image.bin'
+	 * when starting the original image.bin file.
+	 */
+	state->prog_fname = arg;
+
+	return 0;
+}
+SANDBOX_CMDLINE_OPT_SHORT(program, 'p', 1, "U-Boot program name");
+
 static int sandbox_cmdline_cb_memory(struct sandbox_state *state,
 				     const char *arg)
 {