Overlapping PCI Memory Locations

[John Baldwin]

On Friday 07 December 2007 11:21:35 am Coleman Kane wrote:
> Hi,
> 
> I've got a problem where two components on my system have overlapping
> PCI memory regions:
> 
> atapci0: <ATI ATA controller> port 
0x9000-0x9007,0x9008-0x900b,0x9010-0x9017,0x5018-0x501b,0x5020-0x502f mem 
0xd0609000-0xd06093ff irq 16 at device 18.0 on pci0
> 
> atapci0: [ITHREAD]
> 
> pcm0: <ATI SB600 High Definition Audio Controller> mem 0xd0608000-0xd060bfff 
irq 16 at device 20.2 on pci0
> 
> pcm0: hdac_mem_alloc: Unable to allocate memory resource
> 
> 
> 
> Because of this, I cannot use the sound hardware on this system. In
> addition, the memory range used by atapci0 is the SATA AHCI space. The
> ata-chipset.c doesn't currently identify the ATI IXP600 SATA controller
> (just the paired PATA controller), so I can actually use my drives
> through the PATA/IDE compatibility registers in the I/O space. However,
> if I modify ata-chipset.c to add support for the IXP600 SATA controller,
> I get weird results using ATA_INL(..) calls, which look like something
> is interfering with the data I *should* be getting from the SATA mem space.
> 
> In addition, the pcm0 refuses to attach, as above.
> 
> Also, this is a notebook and has one of those crummy notebook BIOSes
> that don't allow fiddling with this sort of stuff in BIOS. Is there any
> facility in the kernel to force these to be remapped (or to perform the
> mappings ourselves and ignore what BIOS tells us)?

No.  You can hack the pci driver to zero out the BAR in either device during 
boot though as a test.

-- 
John Baldwin