Sun4d SMP wierdness

Sun4d SMP wierdness

[C.Newport]

I am trying to track down why 2.4.27 (or any 2.4 series) does a watchdog 
timeout very early in the boot sequence om Sun4d SMP.

In arch/sparc/kernel/setup.c I put some prom_printfs to narrow it down.

setup.c line 450 
 prom_printf("tp6\n");
	paging_init();
 prom_printf("tp7\n");

tp6 gets printed at boot, tp7 does not.

So - in arch/sparc/mm/init.c line 328 I add another test point 

void __init paging_init(void)
{
 prom_printf("mm/init.c:paging_init %d", sparc_cpu_model);
	switch(sparc_cpu_model) {

OUCH - this never gets printed so somewhere the function call to paging_init
is vanishing into lala-land.

At this point I am stumped - What could be happening ?

Chris Newport

Re: Sun4d SMP wierdness

[Thomas Bogendoerfer]

On Sun, Aug 15, 2004 at 01:57:12AM +0100, C.Newport wrote:
> 
> I am trying to track down why 2.4.27 (or any 2.4 series) does a watchdog 
> timeout very early in the boot sequence om Sun4d SMP.

SuperSparc I or II Cpu ?

IMHO SuperSparc II never worked for Sun4d. I've posted a patch against
2.4.something last year, which fixed that problem and I'm waiting
for spare time to bring it forward to 2.6 ...

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                 [ Alexander Viro on linux-kernel ]

Re: Sun4d SMP wierdness

[William Lee Irwin III]

On Sun, Aug 15, 2004 at 01:57:12AM +0100, C.Newport wrote:
>> I am trying to track down why 2.4.27 (or any 2.4 series) does a watchdog 
>> timeout very early in the boot sequence om Sun4d SMP.

On Sun, Aug 15, 2004 at 10:09:39AM +0200, Thomas Bogendoerfer wrote:
> SuperSparc I or II Cpu ?
> IMHO SuperSparc II never worked for Sun4d. I've posted a patch against
> 2.4.something last year, which fixed that problem and I'm waiting
> for spare time to bring it forward to 2.6 ...

Could you send whatever you have now? If it's not merged for 2.4 I'll
send it to marcelo.


-- wli

Re: Sun4d SMP wierdness

[C.Newport]

On Sunday 15 August 2004 9:26 am, William Lee Irwin III wrote:
> On Sun, Aug 15, 2004 at 01:57:12AM +0100, C.Newport wrote:
> >> I am trying to track down why 2.4.27 (or any 2.4 series) does a watchdog
> >> timeout very early in the boot sequence om Sun4d SMP.
>
> On Sun, Aug 15, 2004 at 10:09:39AM +0200, Thomas Bogendoerfer wrote:
> > SuperSparc I or II Cpu ?
> > IMHO SuperSparc II never worked for Sun4d. I've posted a patch against
> > 2.4.something last year, which fixed that problem and I'm waiting
> > for spare time to bring it forward to 2.6 ...
>
> Could you send whatever you have now? If it's not merged for 2.4 I'll
> send it to marcelo.

Found it in the archives - 
http://marc.theaimsgroup.com/?l=linux-sparc&m\x106467967231116&w=2

The patches are against 2.4.22 so I will test them here in 2.4.27 to see
what happens, and possibly merge with Pasi's patches.