Re: anyone know what's going on in dw780_errchk

[Johnny Billquist <bqt%softjar.se@localhost>]

Anders Magnusson wrote:
> Johnny Billquist wrote:
> > Brad Parker wrote:
> > > I seem to have my foot stuck in a gopher hole.  I'm confused about a
> > > few things.
> > >
> > > - the hp.c driver in boot/ ignores the partition argument (making it
> > > impossible
> > > to boot a miniroot I think).  fortunately the other drivers in boot/
> > > (ra & mfm)
> > > do honor the partition arg.
> > >
> > > - if one does get a miniroot kernel to boot, the partition info is not
> > > communicated to the new kernel.  so it thinks you booted from partition 0
> > > ('a') and uses that as root.  rather confusing.
> > >
> > > am I correct about that?
> > >
> > > 4.3bsd sends the boot partition in r10.  It seems like using one of the
> > > "rpb" registers (like r4) might be a better plan.  Is there any reason
> > > not to send the boot partition info in r4?  (i.e. rpb_bootr4)
> > >
> > > other platforms (1-2 anyway) seem to use MAKEBOOTDEV()
> > Not sure how much we care, but VMB have reserved meanings for R0-R5,
> > which we would break by this idea.
> It shouldn't matter here, this code is executed long after VMB is left :-)

Hey. If I need to set R4 to a specific value to make VMB happy, I can't
really set it to something else to make boot happy, can I?

        Johnny

--
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