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Re: netbsd-5.1 cpu probe/attach for 11/7xx?

Older VAXen don't really have a CPU attach function. There can only be one CPU, and it is implicitly already attached.

The system starts by trying to figure out what general type of system it is (checking the SID), and then just start initializing pmap, and all other stuff from there.

Check locore.c, which have the initial CPU type setup code.

So, there is no cpu probe code being done (or needed) for an 11/780, nor any other Unibus VAX.


On 2011-06-25 19:01, Brad Parker wrote:
I've recently been building 5.1 and -current for 11/780 and adding in
11/730 support. I don't think the
cpu probe wiring for the 11/7xx line is correct.

If I use a reasonably stock simh and boot a 5.1 kernel it doesn't seem
to call the attach_cpu
function. It does boot and run (in sim), so that's something.

I'm not exactly sure how the cpu should be attached to be honest. The
bus structure has
always been slightly confusing to me (a picture would sure help).

I ended up adding it on mainbus0 by adding the line "cpu* at mainbus0"
to the kernel config file.
That seemed to work. That appears to be the simplest thing. I did have
to change the match function
in autoconf.c to look for "cpu", however.

Index: autoconf.c
RCS file: /cvsroot/src/sys/arch/vax/vax/autoconf.c,v
retrieving revision 1.90
diff -u -r1.90 autoconf.c
--- autoconf.c 11 Mar 2008 05:34:03 -0000 1.90
+++ autoconf.c 25 Jun 2011 16:59:21 -0000
@@ -121,7 +121,7 @@
struct mainbus_attach_args * const ma = aux;
if (name)
- aprint_normal("%s at %s", ma->ma_type, name);
+ aprint_normal("%s at %s ", ma->ma_type, name);
return UNCONF;

@@ -173,7 +173,7 @@
struct mainbus_attach_args *ma = aux;

- return strcmp(cpu_cd.cd_name, ma->ma_type) == 0;
+ return strcmp("cpu", ma->ma_type) == 0;


I have diffs for 11/730 booting (in sim) for 3.1.1, 5.1 and -current if
anyone wants them. I've recently
moved and dusted off my 11/730 so I hope to try them on real iron in the
next few weeks.


Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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