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Re: PC boot sequence (was: patch: MFSv3 support (libsa) for boot2 (i386))
> > 4) The pbr code now reads the rest of the 8k 'boot code' area at the
> > start of the partition
> This means "MBR partition", right?
I think "MBR_PTYPE_NETBSD" partition in the Master boot record:
> And this "boot code" is what is called "primary boot" in BSD terminology,
> > this is the rest of bootxx_xxxfs.
> What do you mean by "rest of"?
See my first post:
sector 63: pbr.S (first 512 bytes bootxx_ffsvN)
sector 64: NetBSD disklabel (installboot(8) skips here)
sector 65-78: rest of bootxx_ffsvN
sector 79-: UFS superblock
> > 5) The bootxx code now tries to load the 'boot' program from filesystem,
> > it checks the following places for a filesystem:
> I don't quite get why it has to look for a filesystem. I thought
> (and in only 8k it must have) the block numbers of /boot encoded
> into it by installboot?
No. On x86 (and alpha, pmax etc.), primary bootxx_Xfs recognizes
filie system as its name, unlike old sun ports.
(no bbinfo in src/usr.sbin/installboot/arch/i386.c)
> > a) the start of the partition
> This again means "MBR partition", I suppose?
It seems so:
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