linux-kernel - Re: [PATCH -v3 2/2] x86: more early console output from compressed/misc.c

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Message-ID: <4C57371C.4000708@kernel.org>
Date:	Mon, 02 Aug 2010 14:22:36 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Cyrill Gorcunov <gorcunov@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v3 2/2] x86: more early console output from	compressed/misc.c

On 08/02/2010 02:08 PM, H. Peter Anvin wrote:
> On 08/02/2010 01:59 PM, H. Peter Anvin wrote:
>> On 08/02/2010 12:35 PM, Yinghai Lu wrote:
>>>
>>> it seems I can not global variables in arch/x86/boot/compressed/misc.c
>>>
>>
>> I just looked at it, it's the fact that we don't relocate the GOT that
>> is causing problems.  It's relatively easy to fix: here is a patch, but
>> in grand Linus tradition it is completely untested.
>>
> 
> Untested indeed... here is one which doesn't clobber live registers.
> 
> 	-hpa
> 

still doesn't work.

with global early_serial_base got :

early console in setup code
[    0.000000] bootconsole [uart0] enabled


with static early_serial_base got :

early console in setup code
early console in decompress_kernel
decompress_kernel:
  input: [0x24a0269-0x2e8b234], output: 0x1000000, heap: [0x2e909c0-0x2e979bf]

Decompressing Linux... Parsing ELF... done.
Booting the kernel.
[    0.000000] bootconsole [uart0] enabled


Thanks

Yinghai
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