Re: Tracking down BTX behavior change.

Ah, forgot the bug link:

[1]  https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257722

On 8/9/21, John W <jwdevel@gmail.com> wrote:
> I have a problem on my system where 11.3 boots fine, but any supported
> release (11.4, 12.2, 13.0) fail during the BTX stage. There's a bug
> report if you're interested[1]
>
> But my question is: how can I track down differences in BTX code? I
> have the 11.3 and 11.4 SVN sources checked out, and so far I am not
> able to find any differences.
>
> So far, I am looking in: src/stand/i386/btx/ and src/usr.sbin/btxld
>
> I am on amd64, and I do not see any /amd64/ directory, so I am just
> guessing that /i386/ is what I want.
>
> Also: given that the 11.3 boot code works fine, I wonder: what are the
> ramifications of using it on an 11.4 system?
>
> I am not really experienced with the boot loader process, so am not
> sure what the dangers involved are.
> Certainly, I am able to boot in to the new (11.4) kernel with the old
> userland installed. But my woes happened when I did 'make
> installworld', which presumably updated the boot code.
>
> Would it be reasonable to manually roll back the boot code to 11.3,
> but keep the 11.4 userland? Again, I'm really not sure the
> ramifications, just trying to make my system usable again.
>
> Thanks
> -John
>