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    SubjectRe: [PATCH] x86: Setup early console as early as possible
    On 07/12/2010 01:58 AM, Pekka Enberg wrote:
    > Hi Yinghai,
    > Yinghai Lu wrote:
    >> Analyze "console=uart8250,io,0x3f8,115200n8" in
    >> i386_start_kernel/x86_64_start_kernel,
    >> and call setup_early_serial8250_console() to init early serial console.
    >> only can handle io port kind of 8250. because mmio need ioremap.
    >> Signed-off-by: Yinghai Lu <>
    > What's the purpose of this patch? Does it make my early boot I/O patch
    > obsolete?
    > Pekka

    No, they're complementary. Your patch serial-port enables the RM
    kernel, whereas Yinghai pushes the initialization earlier in the PM kernel.

    Incidentally, Yinghai: it would be possible to push even an MMIO
    reference earlier by reserving a fixmap slot for the early console. I'm
    not sure if it's worth it, though.


    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.

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