Re: [OpenBIOS] Booting SunOS from OpenBIOS

[Tarl Neustaedter]

On 2013-Apr-2 17:37 , Artyom Tarasenko wrote:
> > > to:
> > >
> > > virt = ofmem_claim_virt(pointer2cell(va), size, align);
> > >
> > > Does that fix the bug for you?
>
> At least, it seems to die some instructions later, thanks! Will debug more.
> Does it mean that obp_memalloc is actually using the first argument
> just as a hint? As the OpenSolaris header suggests?

Per IEEE 1275, 6.3.2.4, the /claim/ method is supposed to entirely 
ignore the virtual address if you provide an alignment. With a non-zero 
alignment, it's supposed to allocate from a pool of its own address space.

Booting SunOS from OpenBIOS

[Artyom Tarasenko]

Hi Tarl,

On Tue, Apr 2, 2013 at 11:43 PM, Tarl Neustaedter  wrote:
> On 2013-Apr-2 17:37 , Artyom Tarasenko wrote:
> > to:
> >
> > virt = ofmem_claim_virt(pointer2cell(va), size, align);
> >
> > Does that fix the bug for you?
>
> At least, it seems to die some instructions later, thanks! Will debug more.
> Does it mean that obp_memalloc is actually using the first argument
> just as a hint? As the OpenSolaris header suggests?
>
> Per IEEE 1275, 6.3.2.4, the claim method is supposed to entirely ignore the
> virtual address if you provide an alignment. With a non-zero alignment, it's
> supposed to allocate from a pool of its own address space.

Thanks, this is a good starting point. Can you give some comments to an
OpenSolaris comment below?
http://fxr.watson.org/fxr/source/sun/sys/promif.h?v=OPENSOLARIS#L79

/*
 * resource allocation group: OBP and IEEE 1275-1994.
 * prom_alloc is platform dependent on SPARC.
 */

What is exactly platform dependent?

Artyom

linux/sparc and solaris/sparc under qemu blog:
http://tyom.blogspot.com/search/label/qemu