Re: [PATCH]PCI on SWARM

[Jes Sorensen <jes@wildopensource.com>]

>>>>> "Ralf" == Ralf Baechle <ralf@linux-mips.org> writes:

Ralf> On Mon, Oct 18, 2004 at 04:44:17AM -0400, Jes Sorensen wrote:
>> Dual address cycles, ie. 64 bit addressing is fscked on the 1250
>> from what I remember. Correct way to work around this is to stick
>> all physical memory outside the 32 bit space into ZONE_HIGHMEM -
>> had a patch for 2.4, but I lost it ages ago ;-(

Ralf> The Momentum Jaguar suffers from similar problems, so I've
Ralf> implemented that for Linux 2.6 as CONFIG_LIMITED_DMA.

Wouldn't it be better to always have the highmem zone configured and
then just fill it up with pages if you have a b0rked platform? The
cost of this is miniscule.

>> One can just hope Broadcom will learn how to make chips some day
>> ;-(

Ralf> Well, they've just done their homework, also known as the 1450.
Ralf> Pick your red pen and give grades ;-)

The moment I receive one in my mailbox ;-)

Cheers,
Jes