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-rw-r--r--target/linux/generic/hack-5.15/420-mtd-set-rootfs-to-be-root-dev.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/generic/hack-5.15/420-mtd-set-rootfs-to-be-root-dev.patch b/target/linux/generic/hack-5.15/420-mtd-set-rootfs-to-be-root-dev.patch
new file mode 100644
index 0000000000..b071ac61ec
--- /dev/null
+++ b/target/linux/generic/hack-5.15/420-mtd-set-rootfs-to-be-root-dev.patch
@@ -0,0 +1,42 @@
+From: Gabor Juhos <juhosg@openwrt.org>
+Subject: kernel/3.1[02]: move MTD root device setup code to mtdcore
+
+The current code only allows to automatically set
+root device on MTD partitions. Move the code to MTD
+core to allow to use it with all MTD devices.
+
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+ drivers/mtd/mtdcore.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -27,6 +27,7 @@
+ #include <linux/reboot.h>
+ #include <linux/leds.h>
+ #include <linux/debugfs.h>
++#include <linux/root_dev.h>
+ #include <linux/nvmem-provider.h>
+
+ #include <linux/mtd/mtd.h>
+@@ -694,6 +695,19 @@ int add_mtd_device(struct mtd_info *mtd)
+ of this try_ nonsense, and no bitching about it
+ either. :) */
+ __module_get(THIS_MODULE);
++
++ if (!strcmp(mtd->name, "rootfs") &&
++ IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
++ ROOT_DEV == 0) {
++ unsigned int index = mtd->index;
++ pr_notice("mtd: device %d (%s) set to be root filesystem\n",
++ mtd->index, mtd->name);
++#ifdef CONFIG_FIT_PARTITION
++ index <<= 2;
++#endif
++ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, index);
++ }
++
+ return 0;
+
+ fail_nvmem_add: