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Message-ID: <59674457-eda5-fe3b-65e0-29c20102fe4d@c-s.fr>
Date: Tue, 30 Jul 2019 09:02:45 +0200
From: Christophe Leroy <christophe.leroy@....fr>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>,
benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: Support CMDLINE_EXTEND
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@...iedtelesis.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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