linux-kernel - Re: [REGRESSION] 2.6.24-rc1 fails to boot on a 486

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Message-Id: <200710301407.l9UE7Kwn028913@harpo.it.uu.se>
Date:	Tue, 30 Oct 2007 15:07:20 +0100 (MET)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	mikpe@...uu.se, tglx@...utronix.de
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [REGRESSION] 2.6.24-rc1 fails to boot on a 486

On Mon, 29 Oct 2007 14:47:49 +0100 (CET), Thomas Gleixner wrote:
> On Mon, 29 Oct 2007, Mikael Pettersson wrote:
> 
> > On Sun, 28 Oct 2007 21:33:02 -0700, H. Peter Anvin wrote:
> > > Mikael Pettersson wrote:
> > > > My old 486 fails to boot with the 2.6.24-rc1 kernel.
> > > > Grub loads it, 4 lines of text appear but not the kernel's
> > > > "Linux version <blah> greet", and the machine reboots.
> > > > Double-checked with a serial console: nothing appears
> > > > before it reboots.
> > > 
> > > What four lines of text?
> > 
> > They're impossible to capture because they're only visible
> > on the VGA screen for like 0.2 seconds before the machine
> > reboots and the screen is blanked; they don't show up on
> > the serial console.
> > 
> > They look like paths to the vmlinuz and initrd surrounded
> > by [ ] brackets, so I guess they come from grub.
> 
> Any chance to use serial console ?
> 
> Enable CONFIG_EARLY_PRINTK and add
>  
> earlyprintk=serial,ttyS0,115200,keep
> 
> to the kernel command line.

As I mentioned in my first message, I did hook up
a serial console except I used the console=ttyS0,115200
boot parameter, but the kernel rebooted before any
output appeared. I can try the earlyprintk= version
above next time I'm near the 486 if you think it will
make any difference.

> Can you please provide your .config file ?

I posted a link to it in my first message:

>Config is at http://user.it.uu.se/~mikpe/linux/tmp/486-config-2.6.24-rc1.
>The kernel is unpatched 2.6.24-rc1 compiled with gcc-4.2.2.

/Mikael
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