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Re: ofwboot versions and upgrading
matthew green <mrg%eterna.com.au@localhost> writes:
> ofwboot kernel status
> 3 3 works (my machine to be upgraded is fine)
> 4 4 works (another of my machines)
> 3 4 fails, kernel complains about bootinfo
> 4 3 ???
> What I would like to know is:
> If I put the netbsd-4 ofwboot in place on my netbsd-3 system, can I
> still boot the netbsd-3 kernel (netbsd.ok) if I need to?
> this should work. you can put ofwboot in as a different name as
> boot that instead of the default. something like this:
> ok> boot ofwboot.new netbsd.new
> works iirc.
I put the old (netbsd-3) ofwboot as ofwboot.ok to go with netbsd.ok, and
the netbsd-4 versions as ofwboot and netbsd.
> if new ofwboot can't boot old netbsd, that seems like a bug to
Indeed, but this machine is remote so I wanted to avoid losing.
> I have installed bootblk from the head of the netbsd-3 branch. Can
> this load the netbsd-4 ofwboot? Answer: the files /usr/mdec/bootblk
> are byte-for-byte identical on netbsd-3 and netbsd-4, so sure.
> "bootblk" and "ofwboot" are separate. the former is a forth
> bytecode program to load the latter, which is a normal ELF
> file (32 or 64 bit.)
I dimly remember on i386 that there was a new 1st/2nd stage bootblocks
and a new /boot and that the older bootblocks (the analog of bootblk, I
think) couldn't boot the newer /boot, so if you updated in the wrong
order the system was hosed. So I was worried about updating ofwboot
with older 1st-stage bootblocks. But besides knowing that 'bootblk' has
not changed, it sounds like you're saying that the interface to /ofwboot
has not changed.
It would be nice to backport the ofwboot changes to netbsd-3 so that
being up-to-date on netbsd-3 was sufficient to boot netbsd-4 kernels.
But I realize that's both work and risk of instability on netbsd-3, and
that the standard update method is to boot a cd that updates the boot
Thanks for taking the time to answer my questions.
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