[Pkg-xen-devel] libc6-xen not used on AMD Geode LX system

[Jérôme]

    Hi,

    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.

    Thanks,

Jerome