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kernel: mtdsplit_uimage: add "openwrt, ih-magic" device-tree property

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Many devices use uimages with non-standard magic values. Let
device tree override the default magic.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
This commit is contained in:
Bjørn Mork 2021-01-20 18:36:47 +01:00 committed by Petr Štetiar
parent 5ab5bacda2
commit ed39f7ec1a
1 changed files with 23 additions and 18 deletions
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41
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
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@ -69,13 +69,17 @@ read_uimage_header(struct mtd_info *mtd, size_t offset, u_char *buf,
return 0; return 0;
} }
static void uimage_parse_dt(struct mtd_info *master, int *extralen) static void uimage_parse_dt(struct mtd_info *master, int *extralen, u32 *ih_magic)
{ {
struct device_node *np = mtd_get_of_node(master); struct device_node *np = mtd_get_of_node(master);
if (!np || !of_device_is_compatible(np, "openwrt,uimage")) if (!np || !of_device_is_compatible(np, "openwrt,uimage"))
return; return;
of_property_read_u32(np, "openwrt,padding", extralen);
if (!of_property_read_u32(np, "openwrt,padding", extralen))
pr_debug("got openwrt,padding=%d from device-tree\n", *extralen);
if (!of_property_read_u32(np, "openwrt,ih-magic", ih_magic))
pr_debug("got openwrt,ih-magic=%08x from device-tree\n", *ih_magic);
} }
/** /**
@ -87,7 +91,7 @@ static void uimage_parse_dt(struct mtd_info *master, int *extralen)
static int __mtdsplit_parse_uimage(struct mtd_info *master, static int __mtdsplit_parse_uimage(struct mtd_info *master,
const struct mtd_partition **pparts, const struct mtd_partition **pparts,
struct mtd_part_parser_data *data, struct mtd_part_parser_data *data,
ssize_t (*find_header)(u_char *buf, size_t len)) ssize_t (*find_header)(u_char *buf, size_t len, u32 ih_magic))
{ {
struct mtd_partition *parts; struct mtd_partition *parts;
u_char *buf; u_char *buf;
@ -100,6 +104,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
int uimage_part, rf_part; int uimage_part, rf_part;
int ret; int ret;
int extralen = 0; int extralen = 0;
u32 ih_magic = IH_MAGIC;
enum mtdsplit_part_type type; enum mtdsplit_part_type type;
nr_parts = 2; nr_parts = 2;
@ -113,7 +118,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
goto err_free_parts; goto err_free_parts;
} }
uimage_parse_dt(master, &extralen); uimage_parse_dt(master, &extralen, &ih_magic);
/* find uImage on erase block boundaries */ /* find uImage on erase block boundaries */
for (offset = 0; offset < master->size; offset += master->erasesize) { for (offset = 0; offset < master->size; offset += master->erasesize) {
@ -125,7 +130,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (ret) if (ret)
continue; continue;
ret = find_header(buf, MAX_HEADER_LEN); ret = find_header(buf, MAX_HEADER_LEN, ih_magic);
if (ret < 0) { if (ret < 0) {
pr_debug("no valid uImage found in \"%s\" at offset %llx\n", pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
master->name, (unsigned long long) offset); master->name, (unsigned long long) offset);
@ -213,26 +218,26 @@ err_free_parts:
return ret; return ret;
} }
static ssize_t uimage_verify_default(u_char *buf, size_t len) static ssize_t uimage_verify_default(u_char *buf, size_t len, u32 ih_magic)
{ {
struct uimage_header *header = (struct uimage_header *)buf; struct uimage_header *header = (struct uimage_header *)buf;
/* default sanity checks */ /* default sanity checks */
if (be32_to_cpu(header->ih_magic) != IH_MAGIC) { if (be32_to_cpu(header->ih_magic) != ih_magic) {
pr_debug("invalid uImage magic: %08x\n", pr_debug("invalid uImage magic: %08x != %08x\n",
be32_to_cpu(header->ih_magic)); be32_to_cpu(header->ih_magic), ih_magic);
return -EINVAL; return -EINVAL;
} }
if (header->ih_os != IH_OS_LINUX) { if (header->ih_os != IH_OS_LINUX) {
pr_debug("invalid uImage OS: %08x\n", pr_debug("invalid uImage OS: %08x != %08x\n",
be32_to_cpu(header->ih_os)); be32_to_cpu(header->ih_os), IH_OS_LINUX);
return -EINVAL; return -EINVAL;
} }
if (header->ih_type != IH_TYPE_KERNEL) { if (header->ih_type != IH_TYPE_KERNEL) {
pr_debug("invalid uImage type: %08x\n", pr_debug("invalid uImage type: %08x != %08x\n",
be32_to_cpu(header->ih_type)); be32_to_cpu(header->ih_type), IH_TYPE_KERNEL);
return -EINVAL; return -EINVAL;
} }
@ -274,7 +279,7 @@ static struct mtd_part_parser uimage_generic_parser = {
#define FW_MAGIC_WNDR3700V2 0x33373031 #define FW_MAGIC_WNDR3700V2 0x33373031
#define FW_MAGIC_WPN824N 0x31313030 #define FW_MAGIC_WPN824N 0x31313030
static ssize_t uimage_verify_wndr3700(u_char *buf, size_t len) static ssize_t uimage_verify_wndr3700(u_char *buf, size_t len, u32 ih_magic)
{ {
struct uimage_header *header = (struct uimage_header *)buf; struct uimage_header *header = (struct uimage_header *)buf;
uint8_t expected_type = IH_TYPE_FILESYSTEM; uint8_t expected_type = IH_TYPE_FILESYSTEM;
@ -336,7 +341,7 @@ static struct mtd_part_parser uimage_netgear_parser = {
#define FW_MAGIC_SG8208M 0x00000006 #define FW_MAGIC_SG8208M 0x00000006
#define FW_MAGIC_SG8310PM 0x83000006 #define FW_MAGIC_SG8310PM 0x83000006
static ssize_t uimage_verify_allnet(u_char *buf, size_t len) static ssize_t uimage_verify_allnet(u_char *buf, size_t len, u32 ih_magic)
{ {
struct uimage_header *header = (struct uimage_header *)buf; struct uimage_header *header = (struct uimage_header *)buf;
@ -383,7 +388,7 @@ static struct mtd_part_parser uimage_allnet_parser = {
#define FW_EDIMAX_OFFSET 20 #define FW_EDIMAX_OFFSET 20
#define FW_MAGIC_EDIMAX 0x43535953 #define FW_MAGIC_EDIMAX 0x43535953
static ssize_t uimage_find_edimax(u_char *buf, size_t len) static ssize_t uimage_find_edimax(u_char *buf, size_t len, u32 ih_magic)
{ {
u32 *magic; u32 *magic;
@ -396,7 +401,7 @@ static ssize_t uimage_find_edimax(u_char *buf, size_t len)
if (be32_to_cpu(*magic) != FW_MAGIC_EDIMAX) if (be32_to_cpu(*magic) != FW_MAGIC_EDIMAX)
return -EINVAL; return -EINVAL;
if (!uimage_verify_default(buf + FW_EDIMAX_OFFSET, len)) if (!uimage_verify_default(buf + FW_EDIMAX_OFFSET, len, ih_magic))
return FW_EDIMAX_OFFSET; return FW_EDIMAX_OFFSET;
return -EINVAL; return -EINVAL;
@ -430,7 +435,7 @@ static struct mtd_part_parser uimage_edimax_parser = {
#define IH_MAGIC_OKLI 0x4f4b4c49 #define IH_MAGIC_OKLI 0x4f4b4c49
static ssize_t uimage_verify_okli(u_char *buf, size_t len) static ssize_t uimage_verify_okli(u_char *buf, size_t len, u32 ih_magic)
{ {
struct uimage_header *header = (struct uimage_header *)buf; struct uimage_header *header = (struct uimage_header *)buf;