i82489_icr_wait: busy panic

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

I have been getting

i82489_icr_wait: busy

panics under -current/i386 recently, more often during shutdown than normal
operation. The odd thing is that according to

/usr/src/sys/arch/x86/include/i82489*.h

"for Pentium local APIC".

I thought the i in i82489 may mean Intel, but

# cpuctl identify 0
cpu0: AMD Athlon (686-class), 1800.18 MHz, id 0x681
cpu0: features c3cbfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features c3cbfbff<PGE,MCA,CMOV,PAT,PSE36,MPC,MMXX,MMX>
cpu0: features c3cbfbff<FXSR,SSE,3DNOW2,3DNOW>
cpu0: "AMD Sempron(TM) 2200+"
cpu0: I-cache 64KB 64B/line 2-way, D-cache 64KB 64B/line 2-way
cpu0: L2 cache 0MB 64B/line 16-way
cpu0: ITLB 16 4KB entries fully associative, 8 4MB entries fully associative
cpu0: DTLB 32 4KB entries fully associative, 8 4MB entries 4-way
cpu0: Initial APIC ID 0
cpu0: AMD Power Management features: 
cpu0: family 06 model 08 extfamily 00 extmodel 00

? (But either way - why the panic?) (it's a trap - no ddb :-/ )

Cheers,

Patrick