[9fans] Does Plan 9 do this? It crashes QEMU on Leopard

[Pietro Gagliardi]

The following was taken from a log of a run of Plan 9 on QEMU on  
Leopard. When Venti told me it would archive some blocks, this is what  
happened:

Apr 19 21:09:11 ool-18b97500 [0x0-0x44d44d].ch.kberg.q[9530]: sb16:  
attempt to change DMA 8bit 32(1), 16bit 6(5) (val=0x40)

and everything stopped. Does Plan 9 change the DMA in such a way?  
Thanks.