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kernel: add support for mtdsplit-fit offset

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Support devices that has vendor custom header before FIT image.

Some devices has vendor custom header before FIT image. In this case mtd-
split can not find FIT image and it results in rootfs mount failure.
Please refer iptime,a6004mx device for further examples.

Signed-off-by: Yoonji Park <koreapyj@dcmys.kr>
This commit is contained in:
Yoonji Park 2022-06-05 18:04:18 +00:00 committed by Daniel Golle
parent b4d8114770
commit 49763d907b
1 changed files with 7 additions and 4 deletions
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11
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c
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@ -199,6 +199,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
struct fdt_header hdr;
size_t hdr_len, retlen;
size_t offset;
u32 offset_start = 0;
size_t fit_offset, fit_size;
size_t rootfs_offset, rootfs_size;
size_t data_size, img_total, max_size = 0;
@ -211,11 +212,13 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
if (cmdline_match && !strstr(saved_command_line, cmdline_match))
return -ENODEV;
of_property_read_u32(np, "openwrt,fit-offset", &offset_start);
hdr_len = sizeof(struct fdt_header);
/* Parse the MTD device & search for the FIT image location */
for(offset = 0; offset + hdr_len <= mtd->size; offset += mtd->erasesize) {
ret = mtd_read(mtd, offset, hdr_len, &retlen, (void*) &hdr);
ret = mtd_read(mtd, offset + offset_start, hdr_len, &retlen, (void*) &hdr);
if (ret) {
pr_err("read error in \"%s\" at offset 0x%llx\n",
mtd->name, (unsigned long long) offset);
@ -259,7 +262,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
enum mtdsplit_part_type type;
/* Search for the rootfs partition after the FIT image */
ret = mtd_find_rootfs_from(mtd, fit_offset + fit_size, mtd->size,
ret = mtd_find_rootfs_from(mtd, fit_offset + fit_size + offset_start, mtd->size,
&rootfs_offset, &type);
if (ret) {
pr_info("no rootfs found after FIT image in \"%s\"\n",
@ -275,7 +278,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
parts[0].name = KERNEL_PART_NAME;
parts[0].offset = fit_offset;
parts[0].size = mtd_rounddown_to_eb(fit_size, mtd) + mtd->erasesize;
parts[0].size = mtd_rounddown_to_eb(fit_size + offset_start, mtd) + mtd->erasesize;
if (type == MTDSPLIT_PART_TYPE_UBI)
parts[1].name = UBI_PART_NAME;
@ -290,7 +293,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
} else {
/* Search for rootfs_data after FIT external data */
fit = kzalloc(fit_size, GFP_KERNEL);
ret = mtd_read(mtd, offset, fit_size, &retlen, fit);
ret = mtd_read(mtd, offset, fit_size + offset_start, &retlen, fit);
if (ret) {
pr_err("read error in \"%s\" at offset 0x%llx\n",
mtd->name, (unsigned long long) offset);