Re: kern/51148: i386 install floppies no longer boot

[Maxime Villard <max%m00nbsd.net@localhost>]

First of all, I'm not subscribed to netbsd-bugs@, so please forward your mails
to me.

I have carefully investigated the mappings on amd64 and i386 with a kernel page
explorer I wrote, and there no issue. The levels are all linear, with no holes
in the middle, they are correctly linked, and they cover the whole kernel image,
preloaded modules and bootstrap tables.

In fact, there appears to be one bug in the L1 slot that should normally point
to the first page of the data segment: it seems to be destroyed. But this issue
was already here before my changes, so I didn't introduce it.

The changes from me you mentioned are all trivial, and it seems highly unlikely
to me that they cause the install failure. Normally, if there were a bug, it
should have been in the previous commmits. Also, my changes are in no way
install-related, and as far as I know, the mappings are the same on
CD/USB/floppy/whatever.

My guess, right now, is that my alignment changes in kern.ldscript somehow
trigger the aforementioned L1 slot bug on floppy installs.

I don't have a floppy device, and right now my NetBSD resources are limited. The
only thing I can do is asking.

	Is the problem still present? (I don't see new entries in the log)
	We are talking about GENERIC, and not GENERIC-PAE, right?
	Does reverting only [1] fix the problem?
	What if you put 'fillkpt' instead of 'fillkpt_nox' in [1]?

Thanks.


 [1] 2016.05.15.07.17.53 maxv src/sys/arch/i386/i386/locore.S 1.124