Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!encore!cloud9!jjmhome!cpoint!die
From: die@cpoint.UUCP (David I. Emery)
Newsgroups: comp.sys.hp
Subject: How do you get to console debug mode on HP-9000/300 ?
Keywords: ROM debugger hp-9000/300 series
Message-ID: <2434@cpoint.UUCP>
Date: 11 Jul 89 04:27:21 GMT
Reply-To: die@cpoint.UUCP (David I. Emery)
Organization: Clearpoint Research Corp., Hopkinton Mass.
Lines: 27


	At the risk of asking a question that must have been asked
before on this group (which I haven't been reading regularly)...
How does one activate the processor ROM hardware debug code on an
HP-9000/300 series box with a model 98562 (25 mhz 68020) processor ? 
We need to poke around in physical address space and would prefer
not to have the kernel running (it appears that if you write your
own little utiity to do it, you can use lseek on /dev/mem with negative
addresses to access physical memory and IO space but that at least
adb, od, and xd refuse to accept negative addresses for /dev/mem).

	The manuals explain how to get into what they call attended
boot mode (by hitting a key during self test) and how to boot various
flavors of OS, but they are completely silent on how to activate
the firmware debugger.   I have a very vague recollection of some
net complaining a while ago about how one had to cut a jumper on the
CPU to allow this on some HP machine - we can certainly cut jumpers
if we have to but need to know  what jumper.

	Can anybody ou there help ?


-- 
	David I. Emery   Clearpoint Research Corp. 
	35 Parkwood Dr, Hopkinton Ma. 01748  1-508-435-7462
	{decvax, cybvax0, mirror}!frog!cpoint!die 
	{m2c}!jjmhome!cpoint!die