Kevin Hilman wrote:
Tejun Heo wrote:
Kevin Hilman wrote:
I've personally seen it working on XScale and ATI's mips.
OK, that's good to know.
For the record, for ATI's new mips platform, sata_sil needs some
modifications. Their PCI bridge can't handle byte-aligned mmio and
the driver had to be modified to use IO address space.
I'm using 2.6.18-rc4 on this XScale IXP425 (big endian) and both the
legacy driver (drivers/ide/pci/siimage.c) and the libata driver
(drivers/scsi/sata_sil.c) cause crashes during probing due to bad
memory accesses.
So, that one can't do byte-aligned mmio either?
Switching the legacy driver into PIO mode makes the probing work
well, but still can't figure out what's happening in the libata
driver, AFICT, it can't do PIO.
By PIO, you mean accessing registers via IO address space instead of
memory address space, right? Not PIO as opposed to DMA.
yes, I mean using PCI IO address space.
Any chance you can share the changes to use IO address space? Maybe
the PCI on this XScale has similar limitations.
Sure, I've just got okay for releasing the code and am going to post
the patches on my website anyway. I'm attaching a patch. This might
not apply cleanly to your kernel but it should give enough idea. Oh
the code kills 4 ports support for 3114 too.
OK, tweaking your patch onto 2.6.18-rc4, I've got it to work using IO
address space. My patch attached for reference. FYI, in addition to
your changes, I also had to change the data_xfer method to use
ata_pio_data_xfer instead of ata_mmio_data_xfer which was faulting since
my arch doesn't have direct memory access to IO space.
Ah... right. ATI is okay with work/double word aligned PIO, so I didn't
notice it.
Thanks.
--
tejun
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