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common: image: Add support for post-processing of images

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This commit allows injecting a board/platform/device-specific post-
processing function into the FIT image data loading process, which can
include modifying the size and altering the starting source address of
an image data artifact. 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_FIT_IMAGE_POST_PROCESS to
allow controlling this feature. If enabled, a platform-specific post-
process function must be provided.

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:
Andreas Dannenberg
2016-07-27 12:12:39 -05:00
committed by Tom Rini
parent b25732c22b
commit eba3fbd6a1
2 changed files with 39 additions and 1 deletions
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26
common/image-fit.c
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@@ -11,9 +11,9 @@
#ifdef USE_HOSTCC
#include "mkimage.h"
#include <image.h>
#include <time.h>
#else
#include <linux/compiler.h>
#include <common.h>
#include <errno.h>
#include <mapmem.h>
@@ -21,6 +21,7 @@
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <image.h>
#include <bootstage.h>
#include <u-boot/crc.h>
#include <u-boot/md5.h>
@@ -1507,6 +1508,12 @@ void fit_conf_print(const void *fit, int noffset, const char *p)
static int fit_image_select(const void *fit, int rd_noffset, int verify)
{
#if !defined(USE_HOSTCC) && defined(CONFIG_FIT_IMAGE_POST_PROCESS)
const void *data;
size_t size;
int ret;
#endif
fit_image_print(fit, rd_noffset, " ");
if (verify) {
@@ -1518,6 +1525,23 @@ static int fit_image_select(const void *fit, int rd_noffset, int verify)
puts("OK\n");
}
#if !defined(USE_HOSTCC) && defined(CONFIG_FIT_IMAGE_POST_PROCESS)
ret = fit_image_get_data(fit, rd_noffset, &data, &size);
if (ret)
return ret;
/* perform any post-processing on the image data */
board_fit_image_post_process((void **)&data, &size);
/*
* update U-Boot's understanding of the "data" property start address
* and size according to the performed post-processing
*/
ret = fdt_setprop((void *)fit, rd_noffset, FIT_DATA_PROP, data, size);
if (ret)
return ret;
#endif
return 0;
}