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image: Support FDTs already loaded at their load address

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boot_get_fdt() expects a uImage-wrapped FDT to be loaded to a staging
location, and then memmove()s it to the load address specified in the
header. This change enhances boot_get_fdt() to detect when the image has
already been loaded to the correct address, and skip this memmove(). The
detection algorithm was written to match the equivalent for the kernel;
see bootm_load_os()'s IH_COMP_NONE case.

v2: New patch

Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2011-11-01 06:28:21 +00:00 committed by Wolfgang Denk
parent 23498935fa
commit e37ae40e9d
1 changed files with 10 additions and 3 deletions
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13
common/image.c
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@ -1374,7 +1374,7 @@ int boot_get_fdt(int flag, int argc, char * const argv[],
const image_header_t *fdt_hdr;
ulong fdt_addr;
char *fdt_blob = NULL;
ulong image_start, image_end;
ulong image_start, image_data, image_end;
ulong load_start, load_end;
#if defined(CONFIG_FIT)
void *fit_hdr;
@ -1482,21 +1482,28 @@ int boot_get_fdt(int flag, int argc, char * const argv[],
* make sure we don't overwrite initial image
*/
image_start = (ulong)fdt_hdr;
image_data = (ulong)image_get_data(fdt_hdr);
image_end = image_get_image_end(fdt_hdr);
load_start = image_get_load(fdt_hdr);
load_end = load_start + image_get_data_size(fdt_hdr);
if (load_start == image_start ||
load_start == image_data) {
fdt_blob = (char *)image_data;
break;
}
if ((load_start < image_end) && (load_end > image_start)) {
fdt_error("fdt overwritten");
goto error;
}
debug(" Loading FDT from 0x%08lx to 0x%08lx\n",
image_get_data(fdt_hdr), load_start);
image_data, load_start);
memmove((void *)load_start,
(void *)image_get_data(fdt_hdr),
(void *)image_data,
image_get_data_size(fdt_hdr));
fdt_blob = (char *)load_start;