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mmc: fsl_esdhc_spl: Add support for builds without CONFIG_SYS_MMC_U_BOOT_OFFS 

When fixed offset via CONFIG_SYS_MMC_U_BOOT_OFFS is not specified then
expects that U-Boot proper is placed immediately after SPL without any
additional padding.

This allows to generate smaller SPL+U-Boot final binary as it is not
required to specify fixed offset to U-Boot proper at SPL compile time.

In this case offset to U-Boot proper is calculated at SPL compile time in
linker script.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
This commit is contained in:
Pali Rohár 2022-08-05 22:09:41 +02:00 committed by Marek Behún
parent 7696b80ec5
commit 5a428e7510
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GPG Key ID: 26BCFA05FCF60E4C
2 changed files with 18 additions and 0 deletions
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10
arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
View File

@ -62,6 +62,13 @@ SECTIONS
__init_begin = .;
__init_end = .;
_end = .;
#ifndef KEEP_RESET_VECTOR
#if defined(CONFIG_SD_BOOT) && !defined(CONFIG_SYS_MMC_U_BOOT_OFFS)
mmc_u_boot_offs = .;
#endif
#endif
#ifdef CONFIG_SPL_SKIP_RELOCATE
. = ALIGN(4);
__bss_start = .;
@ -94,6 +101,9 @@ SECTIONS
.resetvec IMAGE_TEXT_BASE + RESET_VECTOR_OFFSET : {
KEEP(*(.resetvec))
} = 0xffff
#if defined(CONFIG_SD_BOOT) && !defined(CONFIG_SYS_MMC_U_BOOT_OFFS)
mmc_u_boot_offs = .;
#endif
#endif
#ifndef CONFIG_SPL_SKIP_RELOCATE

8
drivers/mmc/fsl_esdhc_spl.c
View File

@ -9,6 +9,10 @@
#include <mmc.h>
#include <malloc.h>
#ifndef CONFIG_SYS_MMC_U_BOOT_OFFS
extern uchar mmc_u_boot_offs[];
#endif
/*
* The environment variables are written to just after the u-boot image
* on SDCard, so we must read the MBR to get the start address and code
@ -149,7 +153,11 @@ again:
val = *(tmp_buf + blk_off + ESDHC_BOOT_IMAGE_ADDR + i);
offset = (offset << 8) + val;
}
#ifndef CONFIG_SYS_MMC_U_BOOT_OFFS
offset += (ulong)&mmc_u_boot_offs - CONFIG_SPL_TEXT_BASE;
#else
offset += CONFIG_SYS_MMC_U_BOOT_OFFS;
#endif
#endif
/*
* Load U-Boot image from mmc into RAM