It would be interesting to know what R0 is trying to point to. Is it just a bad value, memory that should be mapped, a device, ...
Source would be helpful, if you could figure out what the source is (likely compiled C, since it;s Unix). Since the simh code for the devices are mostly the same (?I think?) between the VAX processors, could this be a bug in memory management? Does the 730 have a unique MMU? Anyway, it seems to be something different in simh between the 730 ans the other VAX processors it boots fine on. On Mon, Jul 6, 2015 at 2:13 PM, Ethan Dicks <[email protected]> wrote: > On Mon, Jul 6, 2015 at 3:41 PM, Mark Pizzolato - Info Comm > <[email protected]> wrote: > > Hi Mattis, > > > > I’m working with the disk image you provided. I see the failure on the > > VAX750 simulator. > > Have you tried earlier versions of Ultrix on the 750 simulator? > > > > I initially look at the crash message: > > > > sim> b rq0 > > In a similar vein, some months ago, I was trying to find why that > wouldn't boot 4.3BSD on a Simh 11/730 RB730 disk and I got as far as > tracing into BSD's driver rb.c since it was very early in the process > that things went sideways. I wouldn't be surprised if these two UNIX > boot failures were related - differences/assumptions in how drivers > will treat controllers in VMS that don't apply to UNIX. > > > machine check 2: non-existant reference error > > sumpar = 2 > > va = 80001a90 > > pc = 80087c61 > > > > I note that the PC mentioned is: 80087c61. > > > > If I do the following: > > > > sim> BRE 80087c61> > > sim> SET CPU HISTORY=300 > > sim> B RQ0 > > > > Execution flows up to the indicated address and if I single step from > there, > > the exception is taken. > > I at least had (still have) the source for 4.3BSD. I did narrow > things down quite a bit, but then I ran off to learn more about how > the disk controller works and haven't put any time into it for a few > months. > > -ethan > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh >
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