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    SubjectThis kernel requires the following features not present on the CPU... (on a VIA C7 CPU)

    I have got a VIA EPIA EX15000G Mini-ITX mainboard with a C7 VIA Esther
    processor (1500MHz).
    There are two options in the BIOS that affect CPU feature flags:

    C7 CMPXCHG8 - enable/disable (Disable to install windows NT 4.0) and
    C7 No Execute (NX) - enable/disable

    I enabled both and compiled a new 2.6.22-rc1-mm1 kernel. So far so good.

    The problem is that the system is very unstable and crashes regularly
    (1-3 times a day).
    After a crash the bios resets the two processor flags back to disabled.
    But like this
    the kernel complains and does not continiue booting:

    > This kernel requires the following features not present on the CPU:
    > 0:8

    Each time this happens, I have to go to the BIOS and manually enable
    these flags again.
    That is pretty annoying! :(
    I attached a cpuinfo.txt. When the two flags are disabled, cx8 and nx
    are not listed there.

    Now my question is:

    Would it be possible to override the BIOS settings of cx8 and nx and
    activate it with linux anyway?
    The CPU supports it and I don't see any reason to disable it.

    I already wrote several emails to VIA months ago saying that this is
    probably a bug in their BIOS, but they
    are neitherreleasing a new BIOS nor reacting in any way. Their so called
    support website
    is not helping neither. Since VIA is not helping at all, the only
    soulution I see would be to override the
    BIOS'es decision.

    Concerning the crashes I already changed the memory module, but with no
    success. I'm not sure
    wether this is a hardware or software bug.

    Many regards,
    processor : 0
    vendor_id : CentaurHauls
    cpu family : 6
    model : 10
    model name : VIA Esther processor 1500MHz
    stepping : 9
    cpu MHz : 799.952
    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 vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov pat clflush acpi mmx fxsr sse sse2 nx pni est rng rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en
    bogomips : 1601.30
    clflush size : 64

    000000 (gap: 3bf00000:a4100000)
    Built 1 zonelists in Zone order, mobility grouping on. Total pages: 243571
    Kernel command line: root=/dev/sda3 ro quiet
    mapped APIC to ffffd000 (fee00000)
    mapped IOAPIC to ffffc000 (fec00000)
    Enabling fast FPU save and restore... done.
    Enabling unmasked SIMD FPU exception support... done.
    Initializing CPU#0
    PID hash table entries: 4096 (order: 12, 16384 bytes)
    Detected 1499.916 MHz processor.
    Console: colour VGA+ 80x25
    Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
    Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
    Memory: 969928k/981952k available (1931k kernel code, 11472k reserved, 659k data, 192k init, 64448k highmem)
    virtual kernel memory layout:
    fixmap : 0xfffaa000 - 0xfffff000 ( 340 kB)
    pkmap : 0xff800000 - 0xffc00000 (4096 kB)
    vmalloc : 0xf8800000 - 0xff7fe000 ( 111 MB)
    lowmem : 0xc0000000 - 0xf8000000 ( 896 MB)
    .init : 0xc038a000 - 0xc03ba000 ( 192 kB)
    .data : 0xc02e2c3b - 0xc03879d4 ( 659 kB)
    .text : 0xc0100000 - 0xc02e2c3b (1931 kB)
    Checking if this processor honours the WP bit even in supervisor mode... Ok.
    Calibrating delay using timer specific routine.. 3002.19 BogoMIPS (lpj=5001917)
    Mount-cache hash table entries: 512
    CPU: After generic identify, caps: 87c9bbff 00100000 00000000 00000000 00000081 00000000 00000000
    CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
    CPU: L2 Cache: 128K (64 bytes/line)
    CPU: After all inits, caps: 07c9bbff 00100000 00000000 00000000 00000081 00003fcc 00000000
    Compat vDSO mapped to ffffe000.
    CPU: Centaur VIA Esther processor 1500MHz stepping 09
    Checking 'hlt' instruction... OK.
     \ /
      Last update: 2007-05-17 14:37    [W:0.022 / U:54.052 seconds]
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