Re: Issue booting v2.6.39 .. v3.4-rc6 on hp712/100

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Mon, 2012-05-14 at 18:38 -0400, John David Anglin wrote:
> On 14-May-12, at 6:11 PM, Helge Deller wrote:
> 
> > The B160L and the 715/64 (both 32bit-only PA1.X machines) crashed  
> > with the following trace.
> > All logs attached.
> >
> > Any ideas?
> 
> This is exactly the same failure as reported by Vincent.
> 
> The most likely problem is the PA 1.1 tmpalias support in entry.S is  
> broken.  For example,
> the cache stride that is loaded in flush_dcache_page_asm to register  
> r1 is wrong.  Probably,
> the do_alias macro is wrong for PA 1.1.  This is hunk of code that  
> should be executed
> when a fdc non access fault occurs.
> 
> nadtlb_check_alias_11:
>          do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate
> 
>          idtlba          pte,(va)
>          idtlbp          prot,(va)
> 
>          rfir
>          nop
> 
> The TLB insert instructions on PA 1.1 have a different format than on  
> PA 2.0.  I'm not sure
> how this would corrupt r1.
> 
> On the other hand, I had asked Vincent to put a "b,n ." instruction  
> just before the fdc loop,
> boot, hit the TOC button, and capture the setup registers for the  
> flush operation.  It's possible
> the stride variable has been clobbered.

Actually, I don't think it's that.  I built a PA 1.1 only kernel and
booted it successfully on the C360.  That exercises all the _11 paths,
so I don't think there's a code fault.  I do think there's a non PA1.1
instruction in there somewhere that the C360 wouldn't notice.

James