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firmware-utils: bcm4908img: support extracting bootfs & rootfs

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It's required for upgrading firmware using single partitions instead of
just blindly writing whole image.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-04-05 19:30:06 +02:00
parent 5314cab729
commit e33957c241
1 changed files with 35 additions and 0 deletions
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35
tools/firmware-utils/src/bcm4908img.c
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@ -54,6 +54,8 @@
#define WFI_FLAG_HAS_PMC 0x1
#define WFI_FLAG_SUPPORTS_BTRM 0x2
#define UBI_EC_HDR_MAGIC 0x55424923
static int debug;
struct bcm4908img_tail {
@ -79,6 +81,7 @@ struct bcm4908img_info {
size_t file_size;
size_t cferom_offset;
size_t bootfs_offset;
size_t rootfs_offset;
uint32_t crc32; /* Calculated checksum */
struct bcm4908img_tail tail;
};
@ -298,6 +301,31 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) {
return -EPROTO;
}
for (info->rootfs_offset = info->bootfs_offset;
info->rootfs_offset < info->file_size;
info->rootfs_offset += 0x20000) {
uint32_t magic;
if (fseek(fp, info->rootfs_offset, SEEK_SET)) {
err = -errno;
fprintf(stderr, "Failed to fseek: %d\n", err);
return err;
}
bytes = fread(&magic, 1, sizeof(magic), fp);
if (bytes != sizeof(magic)) {
fprintf(stderr, "Failed to read %zu bytes\n", sizeof(magic));
return -EIO;
}
if (be32_to_cpu(magic) == UBI_EC_HDR_MAGIC)
break;
}
if (info->rootfs_offset >= info->file_size) {
fprintf(stderr, "Failed to find rootfs offset\n");
return -EPROTO;
}
/* CRC32 */
/* Start with cferom (or bootfs) - skip vendor header */
@ -366,6 +394,7 @@ static int bcm4908img_info(int argc, char **argv) {
if (info.bootfs_offset != info.cferom_offset)
printf("cferom offset:\t%zu\n", info.cferom_offset);
printf("bootfs offset:\t0x%zx\n", info.bootfs_offset);
printf("rootfs offset:\t0x%zx\n", info.rootfs_offset);
printf("Checksum:\t0x%08x\n", info.crc32);
err_close:
@ -558,6 +587,12 @@ static int bcm4908img_extract(int argc, char **argv) {
fprintf(stderr, "This BCM4908 image doesn't contain cferom\n");
goto err_close;
}
} else if (!strcmp(type, "bootfs")) {
offset = info.bootfs_offset;
length = info.rootfs_offset - offset;
} else if (!strcmp(type, "rootfs")) {
offset = info.rootfs_offset;
length = info.file_size - offset - sizeof(struct bcm4908img_tail);
} else if (!strcmp(type, "firmware")) {
offset = info.bootfs_offset;
length = info.file_size - offset - sizeof(struct bcm4908img_tail);