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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>
This commit is contained in:
Jonas Gorski 2015-10-12 13:13:02 +02:00 committed by Ralf Baechle
parent 5b24d52ce2
commit 2024972ef5
2 changed files with 34 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/mips/Kconfig
View File

@ -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

26
arch/mips/kernel/setup.c
View File

@ -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 (builtin_cmdline[0]) {
strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
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(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);