SiS 5591 requires hw.ata.ata_dma=0 - Why?

Tomaž Borštnar tomaz.borstnar at
Tue Jul 19 06:54:29 PDT 2005

Yiorgos Adamopoulos wrote:
According to ata(4) SiS 5591 is supported at its maximum speed.  However, 
unless I set hw.ata.ata_dma=0 at /boot/loader.conf.local I get:

ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices ..
broken chipset or bad cable. Nothing new :) old VIA chipsets often neeeded such tweaks.

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