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SubjectRe: [PATCH] x86: Setup early console as early as possible
Hi Yingahai,

Yinghai Lu wrote:
> On 07/12/2010 08:47 AM, H. Peter Anvin wrote:
>> 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.
> yes. cover more range.
> Can you consider to ask Pekka to anaylze "console=uart8250,io, 0x3f8,115200n8" instead?
> it looks like we can remove "earlyprintk=ttyS0,115200", or "earlyprintk=serial" etc.
> earlycon=uart8250 or console=uart8250 should be better than earlyprintk.
> because it is shared between different archs already.

So just to clarify: I wasn't ignoring your comment here. I simply
followed hpa's recommendation on which I also happen to agree with
completely. ;-)


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