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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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