ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/generic/pending-5.4/920-mangle_bootargs.patch b/target/linux/generic/pending-5.4/920-mangle_bootargs.patch
new file mode 100644
index 0000000..f0f58e7
--- /dev/null
+++ b/target/linux/generic/pending-5.4/920-mangle_bootargs.patch
@@ -0,0 +1,71 @@
+From: Imre Kaloz <kaloz@openwrt.org>
+Subject: init: add CONFIG_MANGLE_BOOTARGS and disable it by default
+
+Enabling this option renames the bootloader supplied root=
+and rootfstype= variables, which might have to be know but
+would break the automatisms OpenWrt uses.
+
+Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
+---
+ init/Kconfig | 9 +++++++++
+ init/main.c | 24 ++++++++++++++++++++++++
+ 2 files changed, 33 insertions(+)
+
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1684,6 +1684,15 @@ config EMBEDDED
+ an embedded system so certain expert options are available
+ for configuration.
+
++config MANGLE_BOOTARGS
++ bool "Rename offending bootargs"
++ depends on EXPERT
++ help
++ Sometimes the bootloader passed bogus root= and rootfstype=
++ parameters to the kernel, and while you want to ignore them,
++ you need to know the values f.e. to support dual firmware
++ layouts on the flash.
++
+ config HAVE_PERF_EVENTS
+ bool
+ help
+--- a/init/main.c
++++ b/init/main.c
+@@ -367,6 +367,29 @@ static inline void setup_nr_cpu_ids(void
+ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
+ #endif
+
++#ifdef CONFIG_MANGLE_BOOTARGS
++static void __init mangle_bootargs(char *command_line)
++{
++ char *rootdev;
++ char *rootfs;
++
++ rootdev = strstr(command_line, "root=/dev/mtdblock");
++
++ if (rootdev)
++ strncpy(rootdev, "mangled_rootblock=", 18);
++
++ rootfs = strstr(command_line, "rootfstype");
++
++ if (rootfs)
++ strncpy(rootfs, "mangled_fs", 10);
++
++}
++#else
++static void __init mangle_bootargs(char *command_line)
++{
++}
++#endif
++
+ /*
+ * We need to store the untouched command line for future reference.
+ * We also need to store the touched command line since the parameter
+@@ -597,6 +620,7 @@ asmlinkage __visible void __init start_k
+ pr_notice("%s", linux_banner);
+ early_security_init();
+ setup_arch(&command_line);
++ mangle_bootargs(command_line);
+ setup_command_line(command_line);
+ setup_nr_cpu_ids();
+ setup_per_cpu_areas();