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SubjectRe: [PATCH] powerpc: Support CMDLINE_EXTEND
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Le 24/07/2019 à 07:33, Chris Packham a écrit :
> Device tree aware platforms can make use of CMDLINE_EXTEND to extend the
> kernel command line provided by the bootloader. This is particularly
> useful to set parameters for built-in modules that would otherwise be
> done at module insertion. Add support for this in the powerpc
> architecture.
>
> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
> ---
> arch/powerpc/Kconfig | 12 ++++++++++++

I think you also have to implement some stuff in early_cmdline_parse()
in arch/powerpc/kernel/prom_init.c

Maybe look at https://patchwork.ozlabs.org/patch/1074126/

Christophe

> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index d8dcd8820369..cd9b3974aa36 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -851,6 +851,11 @@ config CMDLINE
> some command-line options at build time by entering them here. In
> most cases you will need to specify the root device here.
>
> +choice
> + prompt "Kernel command line type" if CMDLINE != ""
> + default CMDLINE_FORCE
> + depends on CMDLINE_BOOL
> +
> config CMDLINE_FORCE
> bool "Always use the default kernel command string"
> depends on CMDLINE_BOOL
> @@ -860,6 +865,13 @@ config CMDLINE_FORCE
> This is useful if you cannot or don't want to change the
> command-line options your boot loader passes to the kernel.
>
> +config CMDLINE_EXTEND
> + bool "Extend bootloader kernel arguments"
> + help
> + The command-line arguments provided by the boot loader will be
> + appended to the default kernel command string.
> +endchoice
> +
> config EXTRA_TARGETS
> string "Additional default image types"
> help
>

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