i've received this message a few times

	/netbsd: ex0: uplistptr was 0

ex0 is a 3c905C-TX with h/w tx-checksumming enabled.

this appears to mean that the rx "mailbox" was full and that
the chip dma stalled.  the rx ring size is set to 128 (EX_NUPD),
tx is 256.

curious why these are skewed?  warnings if i were to double EX_NUPD?