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The WRT1900AC among other Linksys routers uses a dual-firmware layout.
The bootloader passes the active rootfs in bootargs and also sets the
rootfstype to jffs2 - which is clearly something we don't want.
Rename both root= and rootfstype= variables to avoid issues and also
use the former to dynamically rename the active partition to "ubi".
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
--- a/arch/arm/boot/compressed/atags_to_fdt.c
+++ b/arch/arm/boot/compressed/atags_to_fdt.c
@@ -64,6 +64,18 @@ static uint32_t get_cell_size(const void
return cell_size;
}
+static void mangle_bootargs(void *fdt, const char *fdt_cmdline)
+{
+ char *rootdev;
+ char *rootfs;
+
+ rootdev = strstr(fdt_cmdline, "root=/dev/mtdblock");
+ strncpy(rootdev, "uboot_active_root=", 18);
+
+ rootfs = strstr(fdt_cmdline, "rootfstype");
+ strncpy(rootfs, "origfstype", 10);
+}
+
static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
{
char cmdline[COMMAND_LINE_SIZE];
@@ -133,6 +145,9 @@ int atags_to_fdt(void *atag_list, void *
for_each_tag(atag, atag_list) {
if (atag->hdr.tag == ATAG_CMDLINE) {
+ /* Rename the original root= and rootfstype= options */
+ mangle_bootargs(fdt,
+ atag->u.cmdline.cmdline);
/* Append the ATAGS command line to the device tree
* command line.
* NB: This means that if the same parameter is set in
--- a/arch/arm/boot/compressed/string.c
+++ b/arch/arm/boot/compressed/string.c
@@ -111,6 +111,53 @@ char *strchr(const char *s, int c)
return (char *)s;
}
+/**
+ * strncpy - Copy a length-limited, %NUL-terminated string
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @count: The maximum number of bytes to copy
+ *
+ * The result is not %NUL-terminated if the source exceeds
+ * @count bytes.
+ *
+ * In the case where the length of @src is less than that of
+ * count, the remainder of @dest will be padded with %NUL.
+ *
+ */
+char *strncpy(char *dest, const char *src, size_t count)
+{
+ char *tmp = dest;
+
+ while (count) {
+ if ((*tmp = *src) != 0)
+ src++;
+ tmp++;
+ count--;
+ }
+ return dest;
+}
+
+/**
+ * strstr - Find the first substring in a %NUL terminated string
+ * @s1: The string to be searched
+ * @s2: The string to search for
+ */
+char *strstr(const char *s1, const char *s2)
+{
+ size_t l1, l2;
+
+ l2 = strlen(s2);
+ if (!l2)
+ return (char *)s1;
+ l1 = strlen(s1);
+ while (l1 >= l2) {
+ l1--;
+ if (!memcmp(s1, s2, l2))
+ return (char *)s1;
+ s1++;
+ }
+ return NULL;
+}
#undef memset
void *memset(void *s, int c, size_t count)
--- a/drivers/mtd/ofpart.c
+++ b/drivers/mtd/ofpart.c
@@ -25,12 +25,15 @@ static bool node_has_compatible(struct d
return of_get_property(pp, "compatible", NULL);
}
+static int uboot_active_root;
+
static int parse_ofpart_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct device_node *node;
const char *partname;
+ const char *owrtpart = "ubi";
struct device_node *pp;
int nr_parts, i;
@@ -78,9 +81,15 @@ static int parse_ofpart_partitions(struc
(*pparts)[i].offset = of_read_number(reg, a_cells);
(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
- partname = of_get_property(pp, "label", &len);
- if (!partname)
- partname = of_get_property(pp, "name", &len);
+ if (uboot_active_root && (i == uboot_active_root)) {
+ partname = owrtpart;
+ } else {
+ partname = of_get_property(pp, "label", &len);
+
+ if (!partname)
+ partname = of_get_property(pp, "name", &len);
+ }
+
(*pparts)[i].name = partname;
if (of_get_property(pp, "read-only", &len))
@@ -178,6 +187,18 @@ static int __init ofpart_parser_init(voi
return 0;
}
+static int __init active_root(char *str)
+{
+ get_option(&str, &uboot_active_root);
+
+ if (!uboot_active_root)
+ return 1;
+
+ return 1;
+}
+
+__setup("uboot_active_root=", active_root);
+
static void __exit ofpart_parser_exit(void)
{
deregister_mtd_parser(&ofpart_parser);
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