Re: ISA bus-master DMA on arc

Izumi Tsutsui <[email protected]> Sat, 24 Jun 2006 22:21:44 +0900

Newsgroups	gmane.os.netbsd.ports.arc
Message-ID	<[email protected]>

[email protected] wrote:

> I've had a buslogic ISA controller work in my Deskstation ARCstation
> (aka rPC44) under OpenBSD/arc.  It was a special hacked up driver that
> pefo wrote to make it work...

Hmm, thanks for your info. It looks rPC44 uses physical address
for DMA address of ISA bus-master devices.
(i.e. lower 24bit of KSEG1 address)

On the other hand, NEC PCI based machines (my NEC-JC94 etc.)
use JAZZ DMA TLB for DMA address of PCI bus-master devices.
I wonder what DMA address should be used for EISA based
NEC or PICA machines (which have JAZZ-ISA bridge)...

Umm, should I implement PCI-EISA bridge part for JC94 first?
---
Izumi Tsutsui