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    Subjectcrash on CONFIG_CFAG12864B=y in 2.6.20-rc3-mm1
    (forgot to CC LKML)

    The options,


    causes a crash at boot in 2.6.20-rc3-mm1. I don't have the hardware
    associated with the options. It looks like it just doesn't have guards
    to detect if the hardware doesn't exists.

    Here is the crash,

    ks0108: ERROR: parport didn't find 888 port
    BUG: unable to handle kernel NULL pointer dereference at virtual address 0000004 printing eip:
    *pde = 00000000
    Oops: 0000 [#1]
    last sysfs file:
    Modules linked in:
    CPU: 3
    EIP: 0060:[<c02dbff9>] Not tainted VLI
    EFLAGS: 00010246 (2.6.20-rc3-mm1 #11)
    EIP is at ks0108_writecontrol+0x79/0xc0
    eax: 00001008 ebx: 0000000a ecx: 673e2eb8 edx: 00000001
    esi: 0000000a edi: 00000000 ebp: f7c3ff6c esp: f7c3ff50
    ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068
    Process swapper (pid: 1, ti=f7c3e000 task=f7c26a90 task.ti=f7c3e000)
    Stack: 00000001 f7552c40 f7c3ff60 c0120e3f 00000000 c049f450 00000000 f7c3ff74
    c02dc159 f7c3ff80 c02dc177 00000000 f7c3ff98 c048feda 00000378 c02d74db
    00000000 00000000 f7c3ffe0 c0478610 c03d9d35 00000004 f7c26a90 c0473fc4
    Call Trace:
    [<c01053da>] show_trace_log_lvl+0x1a/0x30
    [<c0105499>] show_stack_log_lvl+0xa9/0xd0
    [<c01056c7>] show_registers+0x207/0x370
    [<c0105949>] die+0x119/0x250
    [<c011d267>] do_page_fault+0x277/0x610
    [<c038e9d4>] error_code+0x7c/0x84
    [<c02dc159>] cfag12864b_e+0x19/0x20
    [<c02dc177>] cfag12864b_page+0x17/0x30
    [<c048feda>] cfag12864b_init+0x8a/0x130
    [<c0478610>] init+0x110/0x250
    [<c0104fd3>] kernel_thread_helper+0x7/0x14
    Code: 8b 98 ec 00 00 00 0f b6 03 24 df 88 45 f3 80 75 f3 20 0f b6 43 01 20 45 f
    EIP: [<c02dbff9>] ks0108_writecontrol+0x79/0xc0 SS:ESP 0068:f7c3ff50
    <0>Kernel panic - not syncing: Attempted to kill init!

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      Last update: 2007-01-07 17:59    [W:0.022 / U:11.204 seconds]
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