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