Re: [OpenBIOS] OpenBios Sparc64

[Tarl Neustaedter]

On 2011-Jul-18 03:09 , Ghitulete Razvan wrote:
> > > Ah - on SPARCs, the video is not at a fixed address. The "display"
> > >  device tree node will tell you what the physical address is (which
> > >  varies from platform to platform) with the "reg" property, and you have
> > >  to "map-in" that physical address to a virtual address.
>
> Do you happen to know/have any books/papers on this aspect of the
> sparc architecture. On the oracle web site I only found the V9, and it
> doesn't mention anything about this stuff, as far as i've read.

Mostly in the IEEE 1275 specification. Look at the "reg" and 
"assigned-address" properties, and the semantics of "map-in".

On SBus machines, the FCode of the SBus cards would created these 
properties indicating where the PIO space of video card would be, on PCI 
machines, the BARs will do this and be reflected in the "reg" and 
"assigned-address" properties.

OpenBios Sparc64

[Ghitulete Razvan]

> Mostly in the IEEE 1275 specification. Look at the "reg" and
> "assigned-address" properties, and the semantics of "map-in".
>
> On SBus machines, the FCode of the SBus cards would created these properties
> indicating where the PIO space of video card would be, on PCI machines, the
> BARs will do this and be reflected in the "reg" and "assigned-address"
> properties.

I started playing with the OpenFirmware(I got a SunBlade in the
meanwhile). But i'm not able to get an instance of the SUNW,m64B, and
as a matter of fact of nothing, as I get a Fast Data Access MMU Miss
every time i try the open-dev command. I know I don't need an instance
to get the .properties of the device, but I think that MUU miss
couldn't be a good thing...