Port-vax archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: installboot is broken

On 2013-03-24 17:48, Martin Husemann wrote:
On Sun, Mar 24, 2013 at 04:39:45PM +0100, Anders Magnusson wrote:
Vax only have one bootblock which is installed in the first 16 sectors
on the disk.
The boot block is the same for all different disk types. Which is nice :-)

Yes, indeed - but Jonny claims the conversion to this sheme broke
preparation of completely zeroed/new disks for 11/750 and others (but
not for micro vaxen, which is the only hardware I have).

Right. Since, if you look in sys/arch/vax/boot/xxboot/start.S, you'll see that there is actually some code in block 0, and a few different entry points, which are used by the 11/750, as well as the generic VMB.EXE. All this code is not written into the disk block 0 by installboot. But the code in start.S is there for a reason... installboot ignores that, and instead does a scheme which only works on the MicroVAXen. :-(


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

Home | Main Index | Thread Index | Old Index