aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic/patches-4.4/995-mangle_bootargs.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/generic/patches-4.4/995-mangle_bootargs.patch')
-rw-r--r--target/linux/generic/patches-4.4/995-mangle_bootargs.patch58
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/995-mangle_bootargs.patch b/target/linux/generic/patches-4.4/995-mangle_bootargs.patch
new file mode 100644
index 0000000000..eb525618aa
--- /dev/null
+++ b/target/linux/generic/patches-4.4/995-mangle_bootargs.patch
@@ -0,0 +1,58 @@
+--- a/init/main.c
++++ b/init/main.c
+@@ -355,6 +355,29 @@ 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
+@@ -527,6 +550,7 @@ asmlinkage __visible void __init start_k
+ pr_notice("%s", linux_banner);
+ setup_arch(&command_line);
+ mm_init_cpumask(&init_mm);
++ mangle_bootargs(command_line);
+ setup_command_line(command_line);
+ setup_nr_cpu_ids();
+ setup_per_cpu_areas();
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1638,6 +1638,15 @@ 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