I was trying to run some PCI ether drivers and always got bus error, at
least when I use ipconfig bootp code.
However, the problem seems to be generic.
Ethernet device writes a whole packet in the memory. Driver and network
stack code often directly dereference a pointer in to the packet.
However, the ether header is 14 byte long. If you align packet from the
beginning, then IP header will be off-aligned.
If this is a valid problem, I think the long term solution should be in
network code, which should not assume they can dereference on an
For short-term solutions, we can have trap handler that supports the
unaligned read/write. Does anybody know if there is such a trap handler