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authorJonas Gorski <jogo@openwrt.org>2015-10-12 14:13:02 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-11-11 10:38:34 +0300
commit2024972ef5330dcae47f400c586764d8f4cb0b04 (patch)
treeb57b861541bfc09ac5200ecf3bced6c8e15309e7 /arch
parent5b24d52ce23d1c7a5c2bd884e57463e266eb8b85 (diff)
downloadlinux-2024972ef5330dcae47f400c586764d8f4cb0b04.tar.xz
MIPS: Make the kernel arguments from dtb available
Similar to how arm allows using selecting between bootloader arguments, dtb arguments and both, allow to select them on mips. But since we have less control over the place of the dtb do not modify it but instead use the boot_command_line for merging them. The default is "use bootloader arguments" to keep the current behaviour as default. Signed-off-by: Jonas Gorski <jogo@openwrt.org> Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: John Crispin <blogic@openwrt.org> Cc: Ganesan Ramalingam <ganesanr@broadcom.com> Cc: Jayachandran C <jchandra@broadcom.com> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: James Hartley <james.hartley@imgtec.com> Patchwork: https://patchwork.linux-mips.org/patch/11284/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig16
-rw-r--r--arch/mips/kernel/setup.c24
2 files changed, 33 insertions, 7 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 8b8cd97cdff9..e3e65ae681c8 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2749,6 +2749,22 @@ choice
if you don't intend to always append a DTB.
endchoice
+choice
+ prompt "Kernel command line type" if !CMDLINE_OVERRIDE
+ default MIPS_CMDLINE_FROM_BOOTLOADER
+
+ config MIPS_CMDLINE_FROM_DTB
+ depends on USE_OF
+ bool "Dtb kernel arguments if available"
+
+ config MIPS_CMDLINE_DTB_EXTEND
+ depends on USE_OF
+ bool "Extend dtb kernel arguments with bootloader arguments"
+
+ config MIPS_CMDLINE_FROM_BOOTLOADER
+ bool "Bootloader kernel arguments if available"
+endchoice
+
endmenu
config LOCKDEP_SUPPORT
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 5b46b672c939..6f142ee4a086 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -617,6 +617,10 @@ static void __init request_crashkernel(struct resource *res)
}
#endif /* !defined(CONFIG_KEXEC) */
+#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
+#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
+#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_EXTEND)
+
static void __init arch_mem_init(char **cmdline_p)
{
struct memblock_region *reg;
@@ -641,18 +645,24 @@ static void __init arch_mem_init(char **cmdline_p)
pr_info("Determined physical RAM map:\n");
print_memory_map();
-#ifdef CONFIG_CMDLINE_BOOL
-#ifdef CONFIG_CMDLINE_OVERRIDE
+#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
#else
+ if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
+ (USE_DTB_CMDLINE && !boot_command_line[0]))
+ strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
+
+ if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
+ }
+
+#if defined(CONFIG_CMDLINE_BOOL)
if (builtin_cmdline[0]) {
- strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
- strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
}
- strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
#endif
-#else
- strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
#endif
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);