IBM 440GX, Ocotea...

Wolfgang Grandegger wolfgang.grandegger at
Wed Mar 24 19:49:22 EST 2004

>-- Original Message --
>Date: Tue, 23 Mar 2004 10:31:22 -0800
>From: Eugene Surovegin <ebs at>
>To: Wolfgang Grandegger <wolfgang.grandegger at>
>Cc: linuxppc-embedded at
>Subject: Re: IBM 440GX, Ocotea...
>On Tue, Mar 23, 2004 at 12:02:31PM +0100, Wolfgang Grandegger wrote:
>> we are currently trying to understand which PPC Linux
>> kernel tree is best suited for the IBM 440GX on the
>> Ocotea eval board. We would like to support the 405GP
>> and 440GP as well.
>> The Ocotea 440GX board seems to be supported in the
>> "linuxppc_2_4_devel" tree. Is this board configuration
>> up-to-date and still maintained?
>unlikely. linuxpp_2_4_devel is officialy "dead" tree :).
>> A more up-to-date implementation seems to be in the
>> "linuxppc-2.4" tree. Are there some open issues or known
>> problems?
>New UIC mode isn't supported yet.
>Work on GigE support is still not finished yet.
>> I realized that the L2 cache has been disabled
>> recently:
>>   $ cat arch/ppc/platforms/ocotea.c
>>   ...
>>   /* Disable L2-Cache due to hardware issues */
>>   ibm440gx_l2c_disable();
>> Does this mean that the L2 cache is unusable on current
>> revisions of the chip? [That's why we would like to use
>> this chip.]
>Yes, we found problems with current chip revisions (A & B).
>Ask your IBM contact for more information.
>> Does this tree support the 405GP and 440GP as well?
>> Could
>> anybody make some comments on the stability? We currently
>> use the "linuxppc_2_4_devel" tree for these processors
>> with little problems.
>I'm using linuxppc-2.4 as of 2.4.21 in production for 440GP,
>440GX, 405GPr, 405EP based hardware.

Great, thanks a lot for the clearification. Unfortunately there
is some confusion and disappointment on what board is well
supported in what tree.


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