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ofwboot versions and upgrading
I am finding the ofwboot version situation a bit confusing.
I have an ultra5 with recent netbsd-3 on it. I normally update machines
with INSTALL-NetBSD from etcmanage by booting the next branch kernel and
then updating userland. It appears in this case that ofwboot/boot.c 1.9
which comes in netbsd-3 is before the critical update in 1.12, and that
netbsd-4 kernels rely on >= 1.12:
date: 2006/01/27 18:31:11; author: cdi; state: Exp; lines: +213 -305
branches: 1.12.2; 1.12.6;
Alter sparc64 bootstrap:
- Map kernel with permanent 4MB pages to ease kernel's life
- Pass mappings down to the kernel as part of bootinfo structure
- Try to detect whether kernel is aware of the new boot scheme or not and
in the former case map the kernel using OpenFirmware and do not pass
- Provide -C switch to force compatibility mode if autodetection fails
- While on this, fix PR #25763: If load of default kernel fails, try one by
one those specified in compiled-in list
Much inspired by the bootloader of FreeBSD, with some imported code from there.
So, I need to install the ofwboot from netbsd-4. But can this boot
netbsd-3 kernels? All of the discussion I've found seems to say
"generally", and the critical questions are the following table:
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?
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.
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