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@@ -1,107 +1,15 @@
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The WRT1900AC among other Linksys routers uses a dual-firmware layout.
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-The bootloader passes the active rootfs in bootargs and also sets the
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-rootfstype to jffs2 - which is clearly something we don't want.
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-
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-Rename both root= and rootfstype= variables to avoid issues and also
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-use the former to dynamically rename the active partition to "ubi".
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-
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+Dynamically rename the active partition to "ubi".
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Signed-off-by: Imre Kaloz <[email protected]>
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---- a/arch/arm/boot/compressed/atags_to_fdt.c
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-+++ b/arch/arm/boot/compressed/atags_to_fdt.c
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-@@ -66,6 +66,18 @@ static uint32_t get_cell_size(const void
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- return cell_size;
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- }
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-
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-+static void mangle_bootargs(void *fdt, const char *fdt_cmdline)
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-+{
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-+ char *rootdev;
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-+ char *rootfs;
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-+
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-+ rootdev = strstr(fdt_cmdline, "root=/dev/mtdblock");
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-+ strncpy(rootdev, "uboot_active_root=", 18);
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-+
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-+ rootfs = strstr(fdt_cmdline, "rootfstype");
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-+ strncpy(rootfs, "origfstype", 10);
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-+}
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-+
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- static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
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- {
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- char cmdline[COMMAND_LINE_SIZE];
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-@@ -135,6 +147,9 @@ int atags_to_fdt(void *atag_list, void *
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-
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- for_each_tag(atag, atag_list) {
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- if (atag->hdr.tag == ATAG_CMDLINE) {
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-+ /* Rename the original root= and rootfstype= options */
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-+ mangle_bootargs(fdt,
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-+ atag->u.cmdline.cmdline);
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- /* Append the ATAGS command line to the device tree
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- * command line.
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- * NB: This means that if the same parameter is set in
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---- a/arch/arm/boot/compressed/string.c
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-+++ b/arch/arm/boot/compressed/string.c
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-@@ -111,6 +111,53 @@ char *strchr(const char *s, int c)
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- return (char *)s;
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- }
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-
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-+/**
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-+ * strncpy - Copy a length-limited, %NUL-terminated string
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-+ * @dest: Where to copy the string to
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-+ * @src: Where to copy the string from
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-+ * @count: The maximum number of bytes to copy
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-+ *
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-+ * The result is not %NUL-terminated if the source exceeds
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-+ * @count bytes.
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-+ *
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-+ * In the case where the length of @src is less than that of
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-+ * count, the remainder of @dest will be padded with %NUL.
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-+ *
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-+ */
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-+char *strncpy(char *dest, const char *src, size_t count)
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-+{
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-+ char *tmp = dest;
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-+
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-+ while (count) {
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-+ if ((*tmp = *src) != 0)
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-+ src++;
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-+ tmp++;
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-+ count--;
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-+ }
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-+ return dest;
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-+}
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-+
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-+/**
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-+ * strstr - Find the first substring in a %NUL terminated string
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-+ * @s1: The string to be searched
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-+ * @s2: The string to search for
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-+ */
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-+char *strstr(const char *s1, const char *s2)
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-+{
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-+ size_t l1, l2;
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-+
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-+ l2 = strlen(s2);
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-+ if (!l2)
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-+ return (char *)s1;
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-+ l1 = strlen(s1);
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-+ while (l1 >= l2) {
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-+ l1--;
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-+ if (!memcmp(s1, s2, l2))
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-+ return (char *)s1;
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-+ s1++;
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-+ }
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-+ return NULL;
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-+}
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- #undef memset
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-
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- void *memset(void *s, int c, size_t count)
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--- a/drivers/mtd/ofpart.c
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+++ b/drivers/mtd/ofpart.c
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@@ -25,12 +25,15 @@ static bool node_has_compatible(struct d
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return of_get_property(pp, "compatible", NULL);
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}
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-+static int uboot_active_root;
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++static int mangled_rootblock;
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+
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static int parse_ofpart_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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@@ -120,7 +28,7 @@ Signed-off-by: Imre Kaloz <[email protected]>
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- partname = of_get_property(pp, "label", &len);
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- if (!partname)
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- partname = of_get_property(pp, "name", &len);
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-+ if (uboot_active_root && (i == uboot_active_root)) {
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++ if (mangled_rootblock && (i == mangled_rootblock)) {
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+ partname = owrtpart;
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+ } else {
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+ partname = of_get_property(pp, "label", &len);
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@@ -138,15 +46,15 @@ Signed-off-by: Imre Kaloz <[email protected]>
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+static int __init active_root(char *str)
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+{
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-+ get_option(&str, &uboot_active_root);
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++ get_option(&str, &mangled_rootblock);
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+
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-+ if (!uboot_active_root)
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++ if (!mangled_rootblock)
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+ return 1;
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+
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+ return 1;
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+}
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+
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-+__setup("uboot_active_root=", active_root);
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++__setup("mangled_rootblock=", active_root);
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+
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static void __exit ofpart_parser_exit(void)
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{
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Imre Kaloz