powerpc: Support CMDLINE_EXTEND

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Bring powerpc in line with other architectures that support extending or
overriding the bootloader provided command line.

The current behaviour is most like CMDLINE_FROM_BOOTLOADER where the
bootloader command line is preferred but the kernel config can provide a
fallback so CMDLINE_FROM_BOOTLOADER is the default. CMDLINE_EXTEND can
be used to append the CMDLINE from the kernel config to the one provided
by the bootloader.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190801225006.21952-1-chris.packham@alliedtelesis.co.nz

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Chris Packham 2019-08-02 10:50:06 +12:00 • committed by Michael Ellerman

parent 6266a4dadb

commit d79fbb3a32

2 changed files with 43 additions and 13 deletions

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20

arch/powerpc/Kconfig

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34

arch/powerpc/kernel/prom_init.c

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