Re: [Qemu-devel] [PATCH]: make pci work with OpenBSD / APM issue

[Chad Page]

        I think if the QEMU IDE devices report PIO only then it won't go
into DMA at all.  But YMMV.

        - Chad


On Mon, 21 Jun 2004, Jonathan Gray wrote:

> The attached patch adds a value to the piix3 register which the OpenBSD
> src/sys/dev/pci/pciide_piix_reg.h calls the "Bus master interface base
> address register" with the value taken from an lspci output google found
> ( http://seclists.org/lists/linux-kernel/2001/Jul/2485.html ).
> 
> I'm not sure of the implications of giving this register a value when
> the comment a few lines down is
> 
> "/* XXX: must add BMDMA support to be fully compliant */"
> 
> But it does let me boot a recent OpenBSD snapshot instead of giving me a
> panic.
> Out of interest is there actual piix3 hardware without BMDMA?
> 
> A separate issue arises when using the recently added APM support.
> Unless I disable APM via boot -c/config/etc I get a console/logfull of
> the following message:
> 
> "apm0: APM set CPU idle: unknown error code? (83)"
> 
> Haven't looked into this one, happy just to have things up and running
> for now.
> 
> regards
> Jonathan
>