Date: Wed, 12 Dec 2007 13:11:06 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hardware@freebsd.org, cokane@freebsd.org Subject: Re: Overlapping PCI Memory Locations Message-ID: <200712121311.06777.jhb@freebsd.org> In-Reply-To: <4759730F.6090302@FreeBSD.org> References: <4759730F.6090302@FreeBSD.org>
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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
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