diff options
Diffstat (limited to 'include/fdt_support.h')
| -rw-r--r-- | include/fdt_support.h | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/include/fdt_support.h b/include/fdt_support.h index 2cd8366898..25600d62f2 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -7,8 +7,7 @@ #ifndef __FDT_SUPPORT_H #define __FDT_SUPPORT_H -#if (defined(CONFIG_OF_LIBFDT) || defined(CONFIG_OF_CONTROL)) && \ - !defined(USE_HOSTCC) +#if !defined(USE_HOSTCC) #include <asm/u-boot.h> #include <linux/libfdt.h> @@ -56,7 +55,17 @@ int fdt_chosen(void *fdt); /** * Add initrd information to the FDT before booting the OS. * - * @param fdt FDT address in memory + * Adds linux,initrd-start and linux,initrd-end properties to the /chosen node, + * creating it if necessary. + * + * A memory reservation for the ramdisk is added to the FDT, or an existing one + * (with matching @initrd_start) updated. + * + * If @initrd_start == @initrd_end this function does nothing and returns 0. + * + * @fdt: Pointer to FDT in memory + * @initrd_start: Start of ramdisk + * @initrd_end: End of ramdisk * Return: 0 if ok, or -FDT_ERR_... on error */ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end); @@ -233,13 +242,23 @@ int ft_system_setup(void *blob, struct bd_info *bd); void set_working_fdt_addr(ulong addr); /** - * shrink down the given blob to minimum size + some extrasize if required + * fdt_shrink_to_minimum() - shrink FDT while allowing for some margin + * + * Shrink down the given blob to 'minimum' size + some extrasize. + * + * The new size is enough to hold the existing contents plus @extrasize bytes, + * plus 5 memory reservations. Also, the end of the FDT is aligned to a 4KB + * boundary, so it might end up up to 4KB larger than needed. + * + * If there is an existing memory reservation for @blob in the FDT, it is + * updated for the new size. * * @param blob FDT blob to update * @param extrasize additional bytes needed * Return: 0 if ok, or -FDT_ERR_... on error */ int fdt_shrink_to_minimum(void *blob, uint extrasize); + int fdt_increase_size(void *fdt, int add_len); int fdt_delete_disabled_nodes(void *blob); @@ -418,7 +437,7 @@ int fdt_valid(struct fdt_header **blobp); */ int fdt_get_cells_len(const void *blob, char *nr_cells_name); -#endif /* ifdef CONFIG_OF_LIBFDT */ +#endif /* !USE_HOSTCC */ #ifdef USE_HOSTCC int fdtdec_get_int(const void *blob, int node, const char *prop_name, |