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kernel: mtdsplit_uimage: read extralen from device tree 

An "openwrt,padding" property in device tree can replace two device
specific parsers.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
This commit is contained in:
Bjørn Mork 2021-01-20 18:36:45 +01:00 committed by Petr Štetiar
parent dd5ac0546c
commit 76ea7a91cf
1 changed files with 14 additions and 10 deletions
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24
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
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@ -19,6 +19,7 @@
#include <linux/version.h>
#include <linux/byteorder/generic.h>
#include <linux/of.h>
#include <dt-bindings/mtd/partitions/uimage.h>
#include "mtdsplit.h"
@ -28,14 +29,6 @@
*/
#define MAX_HEADER_LEN 96
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
#define IH_OS_LINUX 5 /* Linux */
#define IH_TYPE_KERNEL 2 /* OS Kernel Image */
#define IH_TYPE_FILESYSTEM 7 /* Filesystem Image */
/*
* Legacy format image header,
* all data in network byte order (aka natural aka bigendian).
@ -76,6 +69,15 @@ read_uimage_header(struct mtd_info *mtd, size_t offset, u_char *buf,
return 0;
}
static void uimage_parse_dt(struct mtd_info *master, int *extralen)
{
struct device_node *np = mtd_get_of_node(master);
if (!np || !of_device_is_compatible(np, "openwrt,uimage"))
return;
of_property_read_u32(np, "openwrt,padding", extralen);
}
/**
* __mtdsplit_parse_uimage - scan partition and create kernel + rootfs parts
*
@ -97,7 +99,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
size_t rootfs_size = 0;
int uimage_part, rf_part;
int ret;
int extralen;
int extralen = 0;
enum mtdsplit_part_type type;
nr_parts = 2;
@ -111,6 +113,8 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
goto err_free_parts;
}
uimage_parse_dt(master, &extralen);
/* find uImage on erase block boundaries */
for (offset = 0; offset < master->size; offset += master->erasesize) {
struct uimage_header *header;
@ -121,7 +125,6 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (ret)
continue;
extralen = 0;
ret = find_header(buf, MAX_HEADER_LEN, &extralen);
if (ret < 0) {
pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
@ -247,6 +250,7 @@ mtdsplit_uimage_parse_generic(struct mtd_info *master,
static const struct of_device_id mtdsplit_uimage_of_match_table[] = {
{ .compatible = "denx,uimage" },
{ .compatible = "openwrt,uimage" },
{},
};