dmf driver problem

[Keith Muller]

Older cs21 emulex versions of the dmf had a microcode bug that will cause
it to wedge the system by holding onto the unibus forever while doing
dma output (which many drivers do). See your local emulex person about
getting the proms upgraded. I have mods to the 4.3 (june 86) dmf driver
that works on both cs11 and cs21 dmfs. It could be moved to 4.2 with
a little work. Some of the dmf drivers accidently turn off modem signal
interrupts in the section of code that handles a loss of carrier (in dmfrint())
That would cause the line to never respond to carrier after the first connection
completed.

	Keith Muller
	muller at sdcsvax.ucsd.edu
	muller at nprdc.ARPA