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authorAnsuel Smith <ansuelsmth@gmail.com>2021-03-01 00:58:57 +0100
committerPetr Štetiar <ynezz@true.cz>2021-05-07 07:05:16 +0200
commitd53be2a2e98129ecf32009893ec46b1ce644721a (patch)
treea501ae76b98989a5c6b16762c185212c081b840b /target/linux/ipq806x/patches-5.10/0067-generic-Mangle-bootloader-s-kernel-arguments.patch
parent861b82d36ae43efec8d16e61b82482e38996af92 (diff)
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ipq806x: copy kernel 5.4 patches to 5.10
Copy kernel 5.4 patches and config to 5.10 Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Diffstat (limited to 'target/linux/ipq806x/patches-5.10/0067-generic-Mangle-bootloader-s-kernel-arguments.patch')
-rw-r--r--target/linux/ipq806x/patches-5.10/0067-generic-Mangle-bootloader-s-kernel-arguments.patch210
1 files changed, 210 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-5.10/0067-generic-Mangle-bootloader-s-kernel-arguments.patch b/target/linux/ipq806x/patches-5.10/0067-generic-Mangle-bootloader-s-kernel-arguments.patch
new file mode 100644
index 0000000000..751ac10a19
--- /dev/null
+++ b/target/linux/ipq806x/patches-5.10/0067-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
+@@ -1827,6 +1827,17 @@ 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
+@@ -4,6 +4,8 @@
+
+ #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
+@@ -67,6 +69,80 @@ 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];
+@@ -86,12 +162,21 @@ 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';
+
+@@ -166,7 +251,9 @@ 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)
+@@ -210,6 +297,10 @@ 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
+@@ -104,6 +104,10 @@
+ #define CREATE_TRACE_POINTS
+ #include <trace/events/initcall.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);
+@@ -633,6 +637,18 @@ asmlinkage __visible void __init start_k
+ pr_notice("Kernel command line: %s\n", boot_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,