1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
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.
|