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Re: Building 64 bit kernel on Cobalt

To: Linux MIPS List <>
Subject: Re: Building 64 bit kernel on Cobalt
From: Jim Gifford <>
Date: Mon, 12 Mar 2007 17:57:45 -0700
Cc: Franck Bui-Huu <>, Ralf Baechle <>
In-reply-to: <>
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Jim Gifford wrote:
Franck Bui-Huu wrote:

On 3/8/07, Jim Gifford <> wrote:
Ralf Baechle wrote:
> On Sun, Mar 04, 2007 at 03:18:45PM -0800, Jim Gifford wrote:
>> Last working Kernel was 2.6.19 series.

It seems that I broke things again :(

>> Some changes from 2.6.19 and the 2.6.20 make it impossible to build a 64
>> bit kernel to boot on the cobalt. Ya, I know why, building a N32
>> actually but need a 64 bit kernel in order to do that. Anyone got any
>> suggestions. Looking through the difference between the kernels to
>> figure this out, but it's like looking for a needle in a haystack. Any
>> suggestions as to a starting point?
> Try git-bisect to track down the changeset that broke things.
>   Ralf
We got it nailed down to arch/mips/kernel /setup.c. But we have not
isolated which change is actually causing it.

Do you use any initrd ? If so how do you pass its address to the kernel ?

What is your kernel load address ?
Not sure

can you send your .config file you're using ?
I'll send it to you later, since I'm not at the office right now.

We do know that reverting back to the 2.6.19.x arch/mips/kernel /setup.c will fix the issue. We will continue to dwindle it down until we come up
with the offender.

What did the console say ? If nothing early console may help if available.
All I get is this
inflate: decompressing
elf64: 00080000 - 0037701f (ffffffff.80326000) (ffffffff.80000000)
elf64: ffffffff.80080000 (80080000) 2957446t + 151450t
net: interface down


Frank any ideas on a solution?

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