diff options
| author | Chris Cappuccio <chris@cvs.openbsd.org> | 2000-07-07 18:42:18 +0000 |
|---|---|---|
| committer | Chris Cappuccio <chris@cvs.openbsd.org> | 2000-07-07 18:42:18 +0000 |
| commit | 025de15d15bfbc089e2c174c993641fe05d99f97 (patch) | |
| tree | 6b9ee652b8f346080482b7b893cb885dd8ece1be /sys/dev/pci/pciide_amd_reg.h | |
| parent | 1d419d20183a0f020426a726e32ea535ada648ed (diff) | |
From NetBSD:
Match Promise Ultra/100 controller
(Ultra/100 drives will be used as Ultra/66 fow now)
Work-around for a bug in revision D2 AMD controllers
(They do not work correctly with Multiword-DMA mode, workaround is to
disable MW DMA, but this bug does not affect all drives so there is an
option PCIIDE_AMD756_ENABLEDMA to stop this behavior. You know you have
this bug when your system hangs completely with this option.)
Diffstat (limited to 'sys/dev/pci/pciide_amd_reg.h')
| -rw-r--r-- | sys/dev/pci/pciide_amd_reg.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sys/dev/pci/pciide_amd_reg.h b/sys/dev/pci/pciide_amd_reg.h index f683e173bd7..dda05e3dee5 100644 --- a/sys/dev/pci/pciide_amd_reg.h +++ b/sys/dev/pci/pciide_amd_reg.h @@ -1,4 +1,4 @@ -/* $OpenBSD: pciide_amd_reg.h,v 1.1 2000/03/24 17:47:41 chris Exp $ */ +/* $OpenBSD: pciide_amd_reg.h,v 1.2 2000/07/07 18:42:17 chris Exp $ */ /* * Copyright (c) 2000 David Sainty. @@ -38,6 +38,20 @@ * available at: http://www.amd.com/products/cpg/athlon/techdocs/pdf/22548.pdf */ +/* Chip revisions */ +#define AMD756_CHIPREV_D2 3 + +/* Chip revision tests */ + +/* + * The AMD756 chip revision D2 has a bug affecting DMA (but not UDMA) + * modes. The workaround documented by AMD is to not use DMA on any + * drive which does not support UDMA modes. + * + * See: http://www.amd.com/products/cpg/athlon/techdocs/pdf/22591.pdf + */ +#define AMD756_CHIPREV_DISABLEDMA(rev) ((rev) <= AMD756_CHIPREV_D2) + /* Channel enable */ #define AMD756_CHANSTATUS_EN 0x40 #define AMD756_CHAN_EN(chan) (0x01 << (1 - (chan))) |