Date: Mon, 1 Jun 2009 20:19:51 -0400
From: Chuck Ebbert <cebbert@redhat.com>
To: Martin Mueller <mm@sig21.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Kernel locks up when idle on VIA-nano U2300 with VIA VX800 on
 Jetway JNF76-N1GL-LF mainboard
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	<20090426170602.GA26009@catull.sig21.net>
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On Sun, 26 Apr 2009 19:06:02 +0200
Martin Mueller <mm@sig21.net> wrote:

> Hi Jeffrey,
> 
> On Sun, Apr 26, 2009 at 12:25:51PM +0000, Jeffrey Cao wrote:
> > On 2009-04-26, Martin Mueller <mm@sig21.net> wrote:
> 
> > > Next, I downloaded linux-2.6.30-rc3, compiled a minimal version with
> > > just initrd. I left out PCI-support, ACPI and almost everything else
> > > menuconfig allowed me to unselect except the VGA text console. This
> > > kernel locked up after giving me the initial prompt from busybox in
> > > the initrd.
> > >
> > > When adding the following lines in the script executed by the kernel
> > > after booting in the initrd, the system actually works:
> > >
> > >   while true; do true; done &
> > >   /bin/sh
> > >
> > > As soon as I kill the shell loop, the system freezes again.
> > >
> > > So my conclusion is: the kernel locks up the first time the CPU
> > > is idle.
> 
> > This seems something to do with the board and the hard disk drive.
> 
> Thanks for your suggestion, but it has nothing to do with the hardisk.
> As I wrote above, the problem is reproducible with only an initrd, vga
> text console, keyboard and no other driver loaded or compiled in.
> 
> The kernel freezes as soon as it get's idle the first time.
> 

Adding idle=halt to the boot options works. idle=nomwait should work too but
it doesn't.
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