mkimage: fit_image: Add option to make fit header align

The image is usually stored in block device like emmc, SD card, make the
offset of image data aligned to block(512 byte) can avoid data copy
during boot process.
eg. SPL boot from FIT image with external data:
- SPL read the first block of FIT image, and then parse the header;
- SPL read image data separately;
- The first image offset is the base_offset which is the header size;
- The second image offset is just after the first image;
- If the offset of imge does not aligned, SPL will do memcpy;
The header size is a ramdon number, which is very possible not aligned, so
add '-B size'to specify the align size in hex for better performance.

example usage:
  ./tools/mkimage -E -f u-boot.its -B 0x200 u-boot.itb

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Kever Yang 2020-03-30 11:56:24 +08:00 committed by Tom Rini
parent 10d887ddfa
commit ebfe611be9
4 changed files with 38 additions and 15 deletions

View File

@ -304,6 +304,11 @@ Normal kernel FIT image has data embedded within FIT structure. U-Boot image
for SPL boot has external data. Existence of 'data-offset' can be used to
identify which format is used.
For FIT image with external data, it would be better to align each blob of data
to block(512 byte) for block device, so that we don't need to do the copy when
read the image data in SPL. Pass '-B 0x200' to mkimage to align the FIT
structure and data to 512 byte, other values available for other align size.
9) Examples
-----------

View File

@ -422,7 +422,7 @@ err_buf:
*/
static int fit_extract_data(struct image_tool_params *params, const char *fname)
{
void *buf;
void *buf = NULL;
int buf_ptr;
int fit_size, new_size;
int fd;
@ -431,26 +431,33 @@ static int fit_extract_data(struct image_tool_params *params, const char *fname)
int ret;
int images;
int node;
int image_number;
int align_size;
align_size = params->bl_len ? params->bl_len : 4;
fd = mmap_fdt(params->cmdname, fname, 0, &fdt, &sbuf, false, false);
if (fd < 0)
return -EIO;
fit_size = fdt_totalsize(fdt);
/* Allocate space to hold the image data we will extract */
buf = malloc(fit_size);
if (!buf) {
ret = -ENOMEM;
goto err_munmap;
}
buf_ptr = 0;
images = fdt_path_offset(fdt, FIT_IMAGES_PATH);
if (images < 0) {
debug("%s: Cannot find /images node: %d\n", __func__, images);
ret = -EINVAL;
goto err_munmap;
}
image_number = fdtdec_get_child_count(fdt, images);
/*
* Allocate space to hold the image data we will extract,
* extral space allocate for image alignment to prevent overflow.
*/
buf = malloc(fit_size + (align_size * image_number));
if (!buf) {
ret = -ENOMEM;
goto err_munmap;
}
buf_ptr = 0;
for (node = fdt_first_subnode(fdt, images);
node >= 0;
@ -478,17 +485,17 @@ static int fit_extract_data(struct image_tool_params *params, const char *fname)
buf_ptr);
}
fdt_setprop_u32(fdt, node, FIT_DATA_SIZE_PROP, len);
buf_ptr += (len + 3) & ~3;
buf_ptr += ALIGN(len, align_size);
}
/* Pack the FDT and place the data after it */
fdt_pack(fdt);
new_size = fdt_totalsize(fdt);
new_size = ALIGN(new_size, align_size);
fdt_set_totalsize(fdt, new_size);
debug("Size reduced from %x to %x\n", fit_size, fdt_totalsize(fdt));
debug("External data size %x\n", buf_ptr);
new_size = fdt_totalsize(fdt);
new_size = (new_size + 3) & ~3;
munmap(fdt, sbuf.st_size);
if (ftruncate(fd, new_size)) {

View File

@ -79,6 +79,7 @@ struct image_tool_params {
bool external_data; /* Store data outside the FIT */
bool quiet; /* Don't output text in normal operation */
unsigned int external_offset; /* Add padding to external data */
int bl_len; /* Block length in byte for external data */
const char *engine_id; /* Engine to use for signing */
};

View File

@ -98,8 +98,9 @@ static void usage(const char *msg)
" -i => input filename for ramdisk file\n");
#ifdef CONFIG_FIT_SIGNATURE
fprintf(stderr,
"Signing / verified boot options: [-E] [-k keydir] [-K dtb] [ -c <comment>] [-p addr] [-r] [-N engine]\n"
"Signing / verified boot options: [-E] [-B size] [-k keydir] [-K dtb] [ -c <comment>] [-p addr] [-r] [-N engine]\n"
" -E => place data outside of the FIT structure\n"
" -B => align size in hex for FIT structure and header\n"
" -k => set directory containing private keys\n"
" -K => write public keys to this .dtb file\n"
" -c => add comment in signature node\n"
@ -144,7 +145,7 @@ static void process_args(int argc, char **argv)
int opt;
while ((opt = getopt(argc, argv,
"a:A:b:c:C:d:D:e:Ef:Fk:i:K:ln:N:p:O:rR:qsT:vVx")) != -1) {
"a:A:b:B:c:C:d:D:e:Ef:Fk:i:K:ln:N:p:O:rR:qsT:vVx")) != -1) {
switch (opt) {
case 'a':
params.addr = strtoull(optarg, &ptr, 16);
@ -168,6 +169,15 @@ static void process_args(int argc, char **argv)
params.cmdname, optarg);
exit(EXIT_FAILURE);
}
break;
case 'B':
params.bl_len = strtoull(optarg, &ptr, 16);
if (*ptr) {
fprintf(stderr, "%s: invalid block length %s\n",
params.cmdname, optarg);
exit(EXIT_FAILURE);
}
break;
case 'c':
params.comment = optarg;