Xen devel - Dec 2004 - xen 2.0/2.0.1 reboots silently on via C3-cpu

On my lex mainboard with a Via C3 cpu, xen 2.0(.1) reboots (nearly)
immediately without any outputs.

The same setup/version boots without problems on a via epia M board with
a Via C3-2 cpu (Nehemia), having a rather different chipset.

Starting with option noreboot, nobiostables doesn''t change anything
visible.

Is this a known problem? Or just a knowingly unsupported chipset?

Have you any hints how to track down this problem?

thanks

Rupert

----
output from lspci, slightly reformetted for readability:
0000:00:00.0 
Host bridge: VIA Technologies, Inc. VT8601 [Apollo ProMedia] (rev 05)

0000:00:01.0 
PCI bridge: VIA Technologies, Inc. VT8601 [Apollo ProMedia AGP]

0000:00:07.0 
ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev
40)

0000:00:07.1 
IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)

0000:00:07.2 
USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
(rev 1a)

0000:00:07.3 
USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
(rev 1a)

0000:00:07.4 
Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 40)

0000:00:07.5 
Multimedia audio controller: VIA Technologies, Inc. VT82C686 AC97 Audio
Controller (rev 50)

0000:00:08.0 
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)

0000:00:09.0 
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)

0000:00:0b.0 
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)

0000:01:00.0 
VGA compatible controller: Trident Microsystems CyberBlade/i1 (rev 6a)




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On Fri, 3 Dec 2004, Rupert Schlick wrote:
> On my lex mainboard with a Via C3 cpu, xen 2.0(.1) reboots (nearly)
> immediately without any outputs.
Adam Sulmicki has been working this problem. Take a look at the logs if 
there are any to see what he is doing. 

It is a C3 limitation coupled with Xen''s dependence on 4M page tables, 
among other things. 

ron


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On Fri, 3 Dec 2004, Ronald G. Minnich wrote:
>> On my lex mainboard with a Via C3 cpu, xen 2.0(.1) reboots (nearly)
>> immediately without any outputs.
>
> Adam Sulmicki has been working this problem. Take a look at the logs if
> there are any to see what he is doing.
>
> It is a C3 limitation coupled with Xen''s dependence on 4M page
tables,
> among other things.
that is probably correct but .. just for sake of completeness.. which 
exactly C3 cpu is this ? Pasting /proc/cpuinfo would give good 
information.

I also expect to send updated patch to the list on Monday which should 
address all know in issues. FWIW, the issues I ran so far and fixed were:

 	1) lack of 4mb page tables
 	2) lack of support for CMOVE

also, I have this weird problem where the /etc/init.d/xend does not seem 
to work anymore with 4kb pages (as tested on pentium 3 with PAE disabled). 
That seems quie weird. any ideas?

Adam,
who ponders if there exists 686 python version with cmove support... me 
goes off to check.




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Am Sam, den 04.12.2004 schrieb Adam Sulmicki um 1:24:
> On Fri, 3 Dec 2004, Ronald G. Minnich wrote:
> 
> >> On my lex mainboard with a Via C3 cpu, xen 2.0(.1) reboots
(nearly)
> >> immediately without any outputs.
> >
> > Adam Sulmicki has been working this problem. Take a look at the logs
if
> > there are any to see what he is doing.
> >
> > It is a C3 limitation coupled with Xen''s dependence on 4M
page tables,
> > among other things.
> 
> that is probably correct but .. just for sake of completeness.. which 
> exactly C3 cpu is this ? Pasting /proc/cpuinfo would give good 
> information.
cpuinfo of the rebooting machine:

processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 7
model name      : VIA Samuel 2
stepping        : 3
cpu MHz         : 531.930
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de tsc msr cx8 mtrr pge mmx 3dnow
bogomips        : 1044.48

Maybe of some use too, cpuinfo of the _working_ machine:

processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 9
model name      : VIA Nehemiah
stepping        : 5
cpu MHz         : 999.858
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : yes
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu tsc msr cx8 cmov mmx sse rng rng_en
bogomips        : 1992.29
> I also expect to send updated patch to the list on Monday which should 
> address all know in issues. FWIW, the issues I ran so far and fixed were:
> 
>  	1) lack of 4mb page tables
>  	2) lack of support for CMOVE
> 
So there is hope, at least. :-)
 
Rupert



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On Sat, 4 Dec 2004, Rupert Schlick wrote:
> vendor_id       : CentaurHauls
> model name      : VIA Samuel 2
yeah, that''s the "bad" one.
> vendor_id       : CentaurHauls
> model name      : VIA Nehemiah
>> I also expect to send updated patch to the list on Monday which should
>> address all know in issues. FWIW, the issues I ran so far and fixed
were:
>>
>>  	1) lack of 4mb page tables
>>  	2) lack of support for CMOVE
>>
> So there is hope, at least. :-)
if you are up to experimenting:

1) find the patch I posted on list, apply it (note that the email had two 
attachements, you want only one)

http://article.gmane.org/gmane.comp.emulators.xen.devel/3669
http://sourceforge.net/mailarchive/message.php?msg_id=10116333

2) edit Rules.mk

--- /usr/src/cm/xen/xen-2.0.bk-old/xen/arch/x86/Rules.mk-backup 2004-11-15 
11:00:51.000000000 -0700
+++ /usr/src/cm/xen/xen-2.0.bk-old/xen/arch/x86/Rules.mk        2004-12-03 
11:40:52.000000000 -0700
@@ -12,7 +12,7 @@
  CFLAGS  += -msoft-float

  ifeq ($(TARGET_SUBARCH),x86_32)
-CFLAGS  += -m32 -march=i686
+CFLAGS  += -m32 -march=i586
  LDFLAGS := --oformat elf32-i386
  endif

3) add "nosmp" and "noacpi" to xen boot params,

... and see how far you get.


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Am Sam, den 04.12.2004 schrieb Adam Sulmicki um 19:37:
> On Sat, 4 Dec 2004, Rupert Schlick wrote:
> 
> > vendor_id       : CentaurHauls
> > model name      : VIA Samuel 2
> 
> yeah, that''s the "bad" one.
> 
> > vendor_id       : CentaurHauls
> > model name      : VIA Nehemiah
> 
> if you are up to experimenting:
<snipped out>
> ... and see how far you get.
It may take me some days to find the time - so I think it makes more
sense to try with the updated patch which you plan to send on Monday (as
you mentioned in your second last message).

Rupert




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