openwrt/upstream - upstream openwrt

	Commit message (Expand)	Author	Age	Files	Lines
*	build,json: fix compatibility with Python 3.5	Paul Spooren	2020-07-13	1	-1/+1
*	build: fix compatibility with python 3.6	Huangbin Zhan	2020-07-07	1	-3/+4
*	build,json: fix build failure in case no data is found	Daniel Golle	2020-07-03	1	-18/+16
*	build,json: store arch_packages in profiles.json	Paul Spooren	2020-07-03	1	-2/+5
*	build: store default/device packages in JSON	Paul Spooren	2020-06-30	1	-2/+18
*	scripts: JSON merge don't crash if no JSON found	Paul Spooren	2020-04-14	1	-2/+0
*	build: refactor JSON info files to `profiles.json`	Paul Spooren	2020-04-03	1	-0/+39

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 @@ -1939,6 +1939,17 @@ 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 +69,59 @@ static uint32_t get_cell_size(const void return cell_size; } +#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) + +static char *append_rootblock(char *dest, const char *str, int len, void *fdt) +{ + char *ptr, *end; + char *root="root="; + int i, l; + const char *rootblock; + + //ARM doesn't have __HAVE_ARCH_STRSTR, so search manually + ptr = str - 1; + + do { + //first find an 'r' at the begining or after a space + do { + ptr++; + ptr = strchr(ptr, 'r'); + if(!ptr) return dest; + + } while (ptr != str && *(ptr-1) != ' '); + + //then check for the rest + for(i = 1; i <= 4; i++) + if(*(ptr+i) != *(root+i)) break; + + } while (i != 5); + + end = strchr(ptr, ' '); + end = end ? (end - 1) : (strchr(ptr, 0) - 1); + + //find partition number (assumes format root=/dev/mtdXX | /dev/mtdblockXX | yy:XX ) + 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 +141,21 @@ 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'; @@ -148,7 +212,9 @@ 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) @@ -187,6 +253,10 @@ 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 @@ -95,6 +95,10 @@ #include <asm/sections.h> #include <asm/cacheflush.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); @@ -573,6 +577,18 @@ asmlinkage __visible void __init start_k page_alloc_init(); pr_notice("Kernel command line: %s\n", boot_command_line); + +#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 + /* parameters may set static keys */ jump_label_init(); parse_early_param();