diff options
Diffstat (limited to 'target/linux/ipq806x/patches-5.15/0067-generic-Mangle-bootloader-s-kernel-arguments.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-5.15/0067-generic-Mangle-bootloader-s-kernel-arguments.patch | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-5.15/0067-generic-Mangle-bootloader-s-kernel-arguments.patch b/target/linux/ipq806x/patches-5.15/0067-generic-Mangle-bootloader-s-kernel-arguments.patch new file mode 100644 index 0000000000..8f669319ed --- /dev/null +++ b/target/linux/ipq806x/patches-5.15/0067-generic-Mangle-bootloader-s-kernel-arguments.patch @@ -0,0 +1,210 @@ +From 71270226b14733a4b1f2cde58ea9265caa50b38d Mon Sep 17 00:00:00 2001 +From: Adrian Panella <ianchi74@outlook.com> +Date: Thu, 9 Mar 2017 09:37:17 +0100 +Subject: [PATCH 67/69] generic: Mangle bootloader's kernel arguments + +The command-line arguments provided by the boot loader will be +appended to a new device tree property: bootloader-args. +If there is a property "append-rootblock" in DT under /chosen +and a root= option in bootloaders command line it will be parsed +and added to DT bootargs with the form: <append-rootblock>XX. +Only command line ATAG will be processed, the rest of the ATAGs +sent by bootloader will be ignored. +This is usefull in dual boot systems, to get the current root partition +without afecting the rest of the system. + +Signed-off-by: Adrian Panella <ianchi74@outlook.com> +--- + arch/arm/Kconfig | 11 +++++ + arch/arm/boot/compressed/atags_to_fdt.c | 72 ++++++++++++++++++++++++++++++++- + init/main.c | 16 ++++++++ + 3 files changed, 98 insertions(+), 1 deletion(-) + +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -1781,6 +1781,17 @@ config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEN + The command-line arguments provided by the boot loader will be + appended to the the device tree bootargs property. + ++config ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE ++ bool "Append rootblock parsing bootloader's kernel arguments" ++ help ++ The command-line arguments provided by the boot loader will be ++ appended to a new device tree property: bootloader-args. ++ If there is a property "append-rootblock" in DT under /chosen ++ and a root= option in bootloaders command line it will be parsed ++ and added to DT bootargs with the form: <append-rootblock>XX. ++ Only command line ATAG will be processed, the rest of the ATAGs ++ sent by bootloader will be ignored. ++ + endchoice + + config CMDLINE +--- a/arch/arm/boot/compressed/atags_to_fdt.c ++++ b/arch/arm/boot/compressed/atags_to_fdt.c +@@ -5,6 +5,8 @@ + + #if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND) + #define do_extend_cmdline 1 ++#elif defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++#define do_extend_cmdline 1 + #else + #define do_extend_cmdline 0 + #endif +@@ -69,6 +71,80 @@ static uint32_t get_cell_size(const void + return cell_size; + } + ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++/** ++ * taken from arch/x86/boot/string.c ++ * local_strstr - Find the first substring in a %NUL terminated string ++ * @s1: The string to be searched ++ * @s2: The string to search for ++ */ ++static char *local_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; ++} ++ ++static char *append_rootblock(char *dest, const char *str, int len, void *fdt) ++{ ++ char *ptr, *end, *tmp; ++ char *root="root="; ++ char *find_rootblock; ++ int i, l; ++ const char *rootblock; ++ ++ find_rootblock = getprop(fdt, "/chosen", "find-rootblock", &l); ++ if(!find_rootblock) ++ find_rootblock = root; ++ ++ //ARM doesn't have __HAVE_ARCH_STRSTR, so it was copied from x86 ++ ptr = local_strstr(str, find_rootblock); ++ ++ if(!ptr) ++ return dest; ++ ++ end = strchr(ptr, ' '); ++ end = end ? (end - 1) : (strchr(ptr, 0) - 1); ++ ++ // Some boards ubi.mtd=XX,ZZZZ, so let's check for '," too. ++ tmp = strchr(ptr, ','); ++ ++ if(tmp) ++ end = end < tmp ? end : tmp - 1; ++ ++ //find partition number (assumes format root=/dev/mtdXX | /dev/mtdblockXX | yy:XX | ubi.mtd=XX,ZZZZ ) ++ for( i = 0; end >= ptr && *end >= '0' && *end <= '9'; end--, i++); ++ ptr = end + 1; ++ ++ /* if append-rootblock property is set use it to append to command line */ ++ rootblock = getprop(fdt, "/chosen", "append-rootblock", &l); ++ if(rootblock != NULL) { ++ if(*dest != ' ') { ++ *dest = ' '; ++ dest++; ++ len++; ++ } ++ if (len + l + i <= COMMAND_LINE_SIZE) { ++ memcpy(dest, rootblock, l); ++ dest += l - 1; ++ memcpy(dest, ptr, i); ++ dest += i; ++ } ++ } ++ return dest; ++} ++#endif ++ + static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline) + { + char cmdline[COMMAND_LINE_SIZE]; +@@ -88,12 +164,21 @@ static void merge_fdt_bootargs(void *fdt + + /* and append the ATAG_CMDLINE */ + if (fdt_cmdline) { ++ ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++ //save original bootloader args ++ //and append ubi.mtd with root partition number to current cmdline ++ setprop_string(fdt, "/chosen", "bootloader-args", fdt_cmdline); ++ ptr = append_rootblock(ptr, fdt_cmdline, len, fdt); ++ ++#else + len = strlen(fdt_cmdline); + if (ptr - cmdline + len + 2 < COMMAND_LINE_SIZE) { + *ptr++ = ' '; + memcpy(ptr, fdt_cmdline, len); + ptr += len; + } ++#endif + } + *ptr = '\0'; + +@@ -168,7 +253,9 @@ int atags_to_fdt(void *atag_list, void * + else + setprop_string(fdt, "/chosen", "bootargs", + atag->u.cmdline.cmdline); +- } else if (atag->hdr.tag == ATAG_MEM) { ++ } ++#ifndef CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE ++ else if (atag->hdr.tag == ATAG_MEM) { + if (memcount >= sizeof(mem_reg_property)/4) + continue; + if (!atag->u.mem.size) +@@ -212,6 +299,10 @@ int atags_to_fdt(void *atag_list, void * + setprop(fdt, "/memory", "reg", mem_reg_property, + 4 * memcount * memsize); + } ++#else ++ ++ } ++#endif + + return fdt_pack(fdt); + } +--- a/init/main.c ++++ b/init/main.c +@@ -110,6 +110,10 @@ + + #include <kunit/test.h> + ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++#include <linux/of.h> ++#endif ++ + static int kernel_init(void *); + + extern void init_IRQ(void); +@@ -906,6 +910,18 @@ asmlinkage __visible void __init __no_sa + pr_notice("Kernel command line: %s\n", saved_command_line); + /* parameters may set static keys */ + jump_label_init(); ++ ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++ //Show bootloader's original command line for reference ++ if(of_chosen) { ++ const char *prop = of_get_property(of_chosen, "bootloader-args", NULL); ++ if(prop) ++ pr_notice("Bootloader command line (ignored): %s\n", prop); ++ else ++ pr_notice("Bootloader command line not present\n"); ++ } ++#endif ++ + parse_early_param(); + after_dashes = parse_args("Booting kernel", + static_command_line, __start___param, |