Tyan S2885 Thunder K8W lockups

[Gary Jennejohn]

NAKATA Maho writes:
> How to lockup:
> # dd if=/dev/mem of=/dev/null bs=1024k
> about 50 seconds later it lockups. 100% reproducible.
> * Both Optimal/Failsafe setting in BIOS
> * Both MTRR Mapping Continuous/Disabled
> * set hw.physmem="4G" doesn't help
> 
> workaround:
> on board GbE (bge0) and SATA disabled.
> 
> any hints or comments?
> 

I could be wrong, but it seems to me that you might be accessing HW
address space with resulting undesirable side effects since you're
trying to read the entire range which /dev/mem maps.

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Gary Jennejohn / garyjATjennejohnDOTorg gjATfreebsdDOTorg garyjATdenxDOTde