linux-kernel - Re: Linux 2.6.36-rc3

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Date:	Sun, 29 Aug 2010 15:36:47 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.36-rc3

On 08/29/2010 03:27 PM, Yinghai Lu wrote:
> On 08/29/2010 12:24 PM, Torsten Kaiser wrote:
>> On Sun, Aug 29, 2010 at 7:25 PM, Linus Torvalds
>> <torvalds@...ux-foundation.org> wrote:
>>> You all know the drill by now: another week, another -rc.
>>
>> I'm still seeing the regression from -rc1 that the start of the early
>> serial output only contains garbage.
>>
>> I'm blaming commit 8fee13a48e4879fba57725f6d9513df4bfa8e9f3 (x86,
>> setup: enable early console output from the decompressor), because if
>> I'm disabling the new serial_putchar() in
>> arch/x86/boot/compressed/misc.c by putting "return;" in its first
>> line, the output returns to normal.
>>
>> Here the different outputs from the serial console:
>> Start of output from 2.6.35:
>> [    0.000000] Linux version 2.6.35 (root@...ogen) (gcc version 4.4.4
>> (Gentoo 4.4.4-r1 p1.0, pie-0.4.5) ) #1 SMP Mon Aug 2 19:54:57 CEST
>> 2010
>> [    0.000000] Command line: fastboot earlyprintk=serial,ttyS0,115200
>> console=ttyS0,115200 console=tty1 crypt_root=/dev/md3 radeon.modeset=1
>> video=1280x1024
>> [    0.000000] BIOS-provided physical RAM map:
>> [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
>> [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
>> [    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
>>
>> Start of output from 2.6.36-rc1..3:
>> {binary garbage}00000000 - 000000000009fc00 (usable)
>> [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
>> [    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
>>
>> Start of output with disabled serial_putchar():
>> [    0.000000] Linux version 2.6.36-rc3 (root@...ogen) (gcc version
>> 4.4.4 (Gentoo 4.4.4-r1 p1.0, pie-0.4.5) ) #1 SMP Sun Aug 29 19:03:00
>> CEST 2010
>> [    0.000000] Command line: fastboot earlyprintk=serial,ttyS0,115200
>> console=ttyS0,115200 console=tty1 crypt_root=/dev/md3 radeon.modeset=1
>> video=1280x1024
>> [    0.000000] BIOS-provided physical RAM map:
>> [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
>> [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
>> [    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
>>
>> I can't see anything wrong with this commit, but it looks to me, as if
>> the newly added decompressor output gets corrupted somewhere. Could it
>> be my nondefault baud rate at 115200?
>>
> 
> please check if following work...

sorry. 

should be

debug fastboot console=tty1 console=uart8250,io,0x3f8,115200 crypt_root=/dev/md3 radeon.modeset=1 video=1280x1024 
 
and

fastboot console=tty1 console=uart8250,io,0x3f8,115200 crypt_root=/dev/md3 radeon.modeset=1 video=1280x1024 

Thanks

Yinghai Lu
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