Problems booting 2.11 on a 11/84

[Steven M. Schultz]

Hi -

> From: Rick Copeland <rickgc at calweb.com>
> I have connected a Fujisu M2444 9 track to an Emulex TC13 that is in my
> 11/84. The following is what happens when I try to boot a BSD 2.11 tape
> that I made on my uVax3600/TU81+ (@6250 bpi):

	What CSR do you have the TC13 set for?

> 	Enter device name and unit number then press the RETURN key: MS0
> 	Trying MS0	(tape starts rolling)
> 
> 	Starting ROM boot  
> 
> 	140276		(tape stops)
> 	@

	The Boot ROM did it's job of reading in the 512 byte boot record and
	transferring control to location 0.

	The bootblock relocates itself to 48kb which is 0140000.

> cables on the M2444 the LED on the TC13 comes on and the M2444 will not do
> anything.

	I don't think the problem is cabling in this case.  

	If you have another system that you can view the sources with the
	file you really need to have in front of you at this time is
	/usr/src/sys/pdpstand/mtboot.s

	The section of code where the system is halting (with added octal 
	offsets) is:

0262		bne	ctlerr
0264		bit	$!1000,hter(csr)	/ any drive errs except HTER_FCE
0272		beq	bumpaddr		/ no, go bump address
	ctlerr:
0274		halt

	The label 'ctlerr' is shared but it indicates that a controller
	error was encountered out of the 'tmtscom' common logic (shared between
	the MT and MS drivers):

tmtscom:
	bit	$100200,(csr)		/ error or ready?
	beq	tmtscom			/ neither, keep looking
	bmi	ctlerr			/ error - go halt


	The thing to try is when the system halts looking at the registers
	(R0 thru R5) _and_ the tape controller registers (starting at 0172520).

	It's also possible to look at the command buffer being presented to
	the controller by looking at offset 0460 (0140460).  Not sure how useful
	that will be though.

	It might be possible to single step the processor starting at location
	0 as long as R0 and R1 are set up correctly (R0 has the unit number
	and R1 the control register address which is 172522 for MS and MT
	devices).

	Steven

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