linux-kernel - Re: wrong final bzImage build (regading #14270)

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Message-ID: <4ACF6F60.6040606@msgid.tls.msk.ru>
Date:	Fri, 09 Oct 2009 21:14:08 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Cyrill Gorcunov <gorcunov@...il.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: wrong final bzImage build (regading #14270)

H. Peter Anvin пишет:
> On 10/09/2009 07:58 AM, Cyrill Gorcunov wrote:
>> Peter and Sam CC'ed
>>
>> [Michael Tokarev - Fri, Oct 09, 2009 at 06:17:50PM +0400]
>>> Ok, finally the mystery solved.  After a week of
>>> digging.
>>>
>>> The original problem was titled "Cannot boot on
>>> a PIII Celeron", and Rafael filed a bug #14270
>>> for this.
>>>
>>> In short, what I observed was that a new kernel
>>> (2.6.31) fails to boot on a PIII Celeron machine.
>>> But changing just the CPU to plain PIII and voila,
>>> it now works.  I don't know why it behaved this
>>> way, but I found where was the problem, finally.
> 
> We should switch to printf here.  Hexadecimal constants in echo aren't
> guaranteed by POSIX.

That's what I initially proposed.  However, as Scott Olson pointed
out, there's already a fix for this:

http://lkml.org/lkml/2009/8/19/84
http://patchwork.kernel.org/patch/42564/

which uses still-non-portable /bin/echo.

(I wish I knew about it a week before now - it wasn't a pleasant week for me).

Still an interesting result.  I can understand if it failed
for systems with smaller amounts of memory, -- nope, it fails
with Celeron on a 64Mb system, but works on the same system
if I replace the CPU to a real PIII...  Fun.

/mjt
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