Re: [Qemu-ppc] [HelenOS-devel] Regression in ppc-softmmu when running HelenOS

[Mark Cave-Ayland]

On 17/03/12 17:28, Martin Sucha wrote:

Hi Martin,

> Hello Mark,
>
> On Friday 16 March 2012 00:03:21 Mark Cave-Ayland wrote:
> > Please find attached the latest version of my patch which seems to have
> > the same behaviour as git master, except that it now also boots HelenOS.
> > This is based upon the PowerISA reference link you pointed me towards.
> > I've also clarified the comments to make it clearer where the masks have
> > been calculated from, plus modified it so (I hope) it will also work on
> > PPC64.
> >
> > Any feedback/review/testing greatly appreciated.
> Using (a slightly modified version of) your qemu-ppc-v3.patch:
> -+    new_msr = env->msr&  ~0xed36ULL&  ~((target_ulong)1<<  MSR_HVB);
> ++    new_msr = env->msr&  ~0xed36ULL&  ~((target_ulong) MSR_HVB);

Ah I see - the MSR_HVB constant is already shifted. Good catch!

> And using a patch to HelenOS, I'm able to run HelenOS mainline without a
> change to OpenBIOS on ppc32. I see the clock issue Jakub mentioned, but
> otherwise I can use the HelenOS user space graphical console normally.
>
> Attached both patches.

Note that for older versions of HelenOS (such as the 0.4.2 ISO I used 
for testing), you can force the bit-depth back to 8 to allow it to boot 
by adding "-g 800x600x8" on the QEMU command line.

I also see from your patch that VISUAL_RGB_5_5_5_BE is also specified 
for a bit-depth of 16: however once again HelenOS refuses to boot with 
"-g 800x600x16" specified on the QEMU command line so perhaps this is 
not a correct assumption?


ATB,

Mark.