Subject: Re: ISA bus-master DMA on arc
To: None <port-arc@NetBSD.org>
From: Izumi Tsutsui <email@example.com>
Date: 06/24/2006 22:21:44
> 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?