Re: [uml-user] x86_64 UML won't boot on IBM x336

[Blaisorblade <bla...@ya...>]

On Monday 18 July 2005 13:45, Phill Wombat wrote:
> Further to the previous post,

> I noticed, after posting, that the SKAS3 patch is not recognized by the
> kernel compiled on the x336.
For 64-bit host kernels, SKAS is still a work in progress. With that patch I'm 
able to run some simple test programs, but not UML itself, so you should for 
now pass mode=tt on the command line.

Where SKAS mode isn't recognised the SKAS patch is already implied.

> However, here are a couple of lines from the linux kernels from RH73 and
> FC4/32 booting up (both of which recognize SKAS3 on FC4-x86_64). I just
> copied the binaries over and ran them:

> > I've compiled up a kernel using FC4 x86_64 patched with
> > skas-2.6.12-rc4-v9-pre4 after jigging the FC4 rpm spec file.
> >
> > I think it should be OK because I can run an FC4 UML (with a few
> > things *fixed* in the rootfs)
How did you do that? There was a thread about that but I didn't see any "ACK, 
it works" (there was a suggestion about avoiding nash being called).

> > on the 32 bit version of the FC4. (NPTL 
> > can be worked around for the moment in FC4).

> > While I can get the UML booting and working on 32 bit, the 64 bit
> > machine produces:

> > VFS: Mounted root (ext3 filesystem) readonly.
> > request_module: runaway loop modprobe binfmt-464c

This is interesting and clear, however I've resumed this below:

http://lists.debian.org/debian-amd64/2004/01/msg00132.html

However there's something I've not clear: are you trying to run a 32 or 64-bit 
UML ? I'm not referring to the filesystem, but to the UML kernel itself. 
I.e., do you get that with the same UML binary?

> > So I Google about somewhat and all I can find is some references to
> > ELF files not being recognized. This in turn causes the OS to modprobe
> > for the above mentioned module which is meant to gobble up the ELF and
> > load it.

> > More Googling produces references to AMD x86_64 Opterons not having 32
> > bit mode compiled in.... Anyway it's somewhat beyond my understanding
> > at this stage. The IBM x336 is a Xeon with EM64T.
It's not an hardware problem, it's not related to the processor, just to the 
kernel configuration (both host and guest).

Make sure CONFIG_IA32_EMULATION is enabled on the host, and that you're 
running a 32-bit UML kernel (to compile it on x86_64 host, replace ARCH=um 
with ARCH=um SUBARCH=i386).

And explain what was the configuration, I'm just curious how you got this 
situation...
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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