linux-kernel - Re: 2.6.22-rc1-mm1

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Message-ID: <4651CA63.9030903@zytor.com>
Date:	Mon, 21 May 2007 09:35:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	young dave <hidave.darkstar@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22-rc1-mm1

young dave wrote:
> Hi,
> 
> kernel booting and stopped in edd.c:read_sector.
> 
> I add debug messages around the two inline assemblly sentence, recompile
> kernel,
> now strange thing happend, the kernel booting directly, but the printf
> messages can't be seen because it's too rapid.
> 
> can we use printk in boot code?

Well, it's spelt "printf", but same thing.  (Since it doesn't take a
logging priority, it seems better to name it printf.)

This implies a miscompile somewhere, *or* that your bios stomps on
registers that gcc expect preserved, and adding printf's disturbs the
register allocation sufficiently.

Could you send me the arch/i386/boot/setup.elf file from the original,
failed, build?

Thanks.

	-hpa
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