dma error

[ryan chris]

versions this happened on:  4.8-release, 5.1-release, 5.1-current

with dma enabled, panics with anic errors occur left and right during
intensive hdd i/o...  examples are during a non-minimal sysinstall, and
during a tar -xvf of the entire ports collection

this is on an asus a7v-ve (
http://www.hp.com/cposupport/personal_computing/support_doc/bph07371.html
)

-bash-2.05b$ dmesg|grep atapci
atapci0: <VIA 82C686B UDMA100 controller> port 0xd800-0xd80f at device 7.1
on pci0
atapci0: Correcting VIA config for southbridge data corruption bug
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
atapci0: <VIA 82C686B UDMA100 controller> port 0xd800-0xd80f at device 7.1
on pci0
atapci0: Correcting VIA config for southbridge data corruption bug
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0

disabling dma seemed to fix the problem