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-Running sound cards on VIA chipsets
-
-o There are problems with VIA chipsets and sound cards that appear to
- lock the hardware solidly. Test programs under DOS have verified the
- problem exists on at least some (but apparently not all) VIA boards
-
-o VIA have so far failed to bother to answer support mail on the subject
- so if you are a VIA engineer feeling aggrieved as you read this
- document go chase your own people. If there is a workaround please
- let us know so we can implement it.
-
-
-Certain patterns of ISA DMA access used for most PC sound cards cause the
-VIA chipsets to lock up. From the collected reports this appears to cover a
-wide range of boards. Some also lock up with sound cards under Win* as well.
-
-Linux implements a workaround providing your chipset is PCI and you compiled
-with PCI Quirks enabled. If so you will see a message
- "Activating ISA DMA bug workarounds"
-
-during booting. If you have a VIA PCI chipset that hangs when you use the
-sound and is not generating this message even with PCI quirks enabled
-please report the information to the linux-kernel list (see REPORTING-BUGS).
-
-If you are one of the tiny number of unfortunates with a 486 ISA/VLB VIA
-chipset board you need to do the following to build a special kernel for
-your board
-
- edit linux/include/asm-i386/dma.h
-
-change
-
-#define isa_dma_bridge_buggy (0)
-
-to
-
-#define isa_dma_bridge_buggy (1)
-
-and rebuild a kernel without PCI quirk support.
-
-
-Other than this particular glitch the VIA [M]VP* chipsets appear to work
-perfectly with Linux.