jwp@larry.UUCP (08/11/87)
We have several MicroVAX IIs: one running 4.3BSD and
another running ULTRIX 32M. My question concerns the
raboot.s source is /usr/sys/mdec. The raboot.s distributed
with 4.3BSD produces a boot block that appears not to work
with our rd53. We get a "halt instruction encountered"
when we try to reboot. We compared the first block
from /dev/ra0a on the BSD machine with the corresponding
block from the ULTRIX machine, and they miscompare.
A disassembly of the ULTRIX boot block starts off with
nop
nop
brb 5
halt
halt
nop
A disassembly of the BSD boot block generated from raboot.s starts with
halt
halt
nop
nop
nop
nop
My questions:
1. why doesn't raboot.s assemble to something useable?
2. where does ULTRIX get its boot block, and why is it different
than the BSD block?
--
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Jeff Percival (jwp@larry.sal.wisc.edu)