linux-kernel - Re: kernel 2.6.23-rc6 hangs on Geode GX1

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Date:	Thu, 27 Sep 2007 18:33:45 +0200
From:	"Marco Tralli" <marco.tralli@...pon.com>
To:	"Juergen Beisert" <juergen127@...uzholzen.de>,
	<linux-kernel@...r.kernel.org>
Cc:	"Jordan Crouse" <jordan.crouse@....com>
Subject: Re: kernel 2.6.23-rc6 hangs on Geode GX1

Thanks Juergen,

> It runs stable on 5 different GX1 systems.
>
> But I do not use a standard BIOS. I'm using LinuxBIOS instead. But I'm
also using
> these patches.
>

set_cx86_inc was one of performance trick called by geode_configure
I didn't find any documentation about "incrementor margin" before.

But since I'm running on 300MHz GX1 the default kernel is now broken for me!


> --- linux-2.6.22.orig/arch/i386/kernel/cpu/cyrix.c
> +++ linux-2.6.22/arch/i386/kernel/cpu/cyrix.c
> @@ -169,7 +169,7 @@ static void __cpuinit set_cx86_inc(void)
>   setCx86(CX86_PCR1, getCx86(CX86_PCR1) | 0x02);
>   /* PCR0 -- Performance Control */
>   /* Incrementor Margin 10 */
> - setCx86(CX86_PCR0, getCx86(CX86_PCR0) | 0x04);
> + setCx86(CX86_PCR0, getCx86(CX86_PCR0) | 0x05); /* 300MHz CPU */
>   setCx86(CX86_CCR3, ccr3); /* disable MAPEN */
>  }
>

I will try your patch

But again, if those tricks are so system dependent  I suggest to kernel
people to let disable it in default configuration.


Marco

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