[Soekris] 4801 CF, NetBSD-current
soren at soekris.com
Wed Oct 20 19:22:25 UTC 2004
> The modern SanDisk media all do support DMA, but Soekris board wiring
> does not.
> It's just a matter if the CF media reports this feature to the OS.
Just to make it clear:
The CF ATA specification recently added support for DMA, and many newer
CF cards are starting to support it....
The net45xx series will never support DMA, as the SC520 don't have a
real ATA controller, but it will also not be a problem as the ATA
drivers know that and will never try DMA.
The net4801 on the other hand have a real busmaster ATA controller, the
ATA drivers detect that and will try DMA if the CF card reports the
capability. But since the net4801 was designed before the new CF spec,
the wires are not connected, so you need to disable DMA manually.
The next version of the net4801 PCB has already been updated to have
those CF DMA wires, they should start shipping in 4-6 weeks.
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