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libc6-xen not used on AMD Geode LX system


I'm trying to install xen+Debian Etch on a Geode LX system. Xen boots fine, but although the package "libc6-xen" is installed I have a large number of such errors:
      4gb seg fixup, process syslogd (pid 1878), cs:ip 73:b7f24610

All processes triggers it, and from what I've found on the web it's a sign that libc6-xen is not recognized. Indeed:
   minimo:~:2# ldd /bin/echo
       linux-gate.so.1 =>  (0xffffe000)
       libc.so.6 => /lib/tls/libc.so.6 (0xb7e48000)
       /lib/ld-linux.so.2 (0xb7f82000)

   It's /lib/tls and not /lib/tls/i686/cmov.

I have found on the web references to this issue for FC6, with a fix ("hwcap 0 nosegneg" in a file in /etc/ld.so.conf.d, and put the libs in /lib/tls/i686/cmov/nosegneg, ldconfig) but this does not help here. So it may be a capability issue?

When I look at the hardware capabilities needed with "ldconfig -Nv | grep '^/'" I get:
   lib/tls:        (hwcap: 0x8000000000000000)
   /usr/lib/i486:        (hwcap:    0x2000000000000)
   /usr/lib/i686:        (hwcap:    0x8000000000000)
   /usr/lib/i586:        (hwcap:    0x4000000000000)
   /lib/tls/i686:        (hwcap: 0x8008000000000000)
   /usr/lib/i686/cmov:    (hwcap:    0x8000000008000)
   /lib/tls/i686/cmov:    (hwcap: 0x8008000000008000)

0x8000 is CMOV support, which is present on the Geode LX. Here's the whole CPU info:
   minimo:~:3# cat /proc/cpuinfo
   processor       : 0
   vendor_id       : AuthenticAMD
   cpu family      : 5
   model           : 10
   model name      : Geode(TM) Integrated Processor by AMD PCS
   stepping        : 2
   cpu MHz         : 499.919
   cache size      : 128 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 pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow up
   bogomips        : 1001.25

The upper bit is required for TLS, so it's not the problem as TLS is supported. So it should be the middle bit 0x8000000000000 that is not supported. I found a reference to "MP support" but that seems weird --- why would MP support be required here?

All this with GLIBC packages 2.3.6.ds1-8 and linux-image-2.6-xen-686 2.6.18+5.

I can't find more information I can use on hwcap, and I'm not sure the little I found is relevant here. So it's time to ask the experts ;) Is there a limitation in the Geode that prevents it supporting libc6-xen or is it a configuration glitch? Any idea on how to solve this if possible? If you need more input just ask!

   Please CC me in answers as I'm not in the lists.



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