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From: Kumar Gala <galak@kernel.crashing.org>
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Subject: Re: Extended Addressing Mode
Date: Wed, 22 Oct 2008 08:08:42 -0500
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On Oct 22, 2008, at 7:59 AM, R=E9gis Odey=E9 wrote:

> Kumar Gala wrote:
>>
>> On Oct 22, 2008, at 3:59 AM, R=E9gis Odey=E9 wrote:
>>
>>> Hello Everyone,
>>> I'm looking for some information about the Extended Addressing =20
>>> Mode (XAEN bit of HID0 register) of PPC32 support in Linux.
>>> I do not see anything in the main kernel tree but there may be =20
>>> some patches available ?
>>> Any information will be appreciate.
>>> Regards.
>>
>> There are patches from Becky Bruce that are going into 2.6.28.  =20
>> What are you needing >32-bit for?  There are some SW IO MMU changes =20=

>> that are still pending to complete this work.
>>
>> - k
> We are developing a board based on Freescale 8641D which can get 4GB =20=

> of ram. So I need 4GB+IOs (~1GB) of physical addressing space.
> My plan is to put a part of this ram above of 4GB to keep accesses =20
> to the IOs below the 4GB limit. It means non-contiguous ram =20
> addressing and XAEN features to be working.

So we have XAEN support in the tree.. however non-contiguous is =20
something you'll have to work on yourself.  Patches are welcome for this

>
> Where can I glance through Becky patches ?

This is the bulk:

=
http://git.kernel.org/?p=3Dlinux/kernel/git/torvalds/linux-2.6.git;a=3Dcom=
mitdiff;h=3D4ee7084eb11e00eb02dc8435fd18273a61ffa9bf

- k=