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spl: fit: add support for post-processing of images

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The next stage boot loader image and the selected FDT can be post-
processed by board/platform/device-specific code, which can include
modifying the size and altering the starting source address before
copying these binary blobs to their final destination. This might be
desired to do things like strip headers or footers attached to the
images before they were packaged into the FIT, or to perform operations
such as decryption or authentication. Introduce new configuration
option CONFIG_SPL_FIT_IMAGE_POST_PROCESS to allow controlling this
feature. If enabled, a platform-specific post-process function must
be provided.

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Daniel Allred
2016-06-27 09:19:21 -05:00
committed by Tom Rini
parent bf9ec864f4
commit da74d1f341
3 changed files with 47 additions and 5 deletions
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21
common/spl/spl_fit.c
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@@ -132,7 +132,7 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
int data_offset, data_size;
int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
int src_sector;
void *dst;
void *dst, *src;
/*
* Figure out where the external images start. This is the base for the
@@ -206,8 +206,13 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
return -EIO;
debug("image: dst=%p, data_offset=%x, size=%x\n", dst, data_offset,
data_size);
memcpy(dst, dst + get_aligned_image_overhead(info, data_offset),
data_size);
src = dst + get_aligned_image_overhead(info, data_offset);
#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
board_fit_image_post_process((void **)&src, (size_t *)&data_size);
#endif
memcpy(dst, src, data_size);
/* Figure out which device tree the board wants to use */
fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset);
@@ -236,8 +241,14 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
*/
debug("fdt: dst=%p, data_offset=%x, size=%x\n", dst, fdt_offset,
fdt_len);
memcpy(load_ptr + data_size,
dst + get_aligned_image_overhead(info, fdt_offset), fdt_len);
src = dst + get_aligned_image_overhead(info, fdt_offset);
dst = load_ptr + data_size;
#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
board_fit_image_post_process((void **)&src, (size_t *)&fdt_len);
#endif
memcpy(dst, src, fdt_len);
return 0;
}