svn commit: r331209 - head

[Rodney W. Grimes]

> On Mon, Mar 19, 2018 at 11:51 AM, Andriy Gapon <avg at freebsd.org> wrote:
> 
> > On 19/03/2018 18:20, John Baldwin wrote:
> > > On Monday, March 19, 2018 03:27:53 PM Kyle Evans wrote:
> > >> Author: kevans
> > >> Date: Mon Mar 19 15:27:53 2018
> > >> New Revision: 331209
> > >> URL: https://svnweb.freebsd.org/changeset/base/331209
> > >>
> > >> Log:
> > >>   Add note to UPDATING about UEFI changes requiring loader(8) update
> > >>
> > >>   These problems have only been observed with boards using U-Boot (e.g.
> > ARM)
> > >>   where virtual addresses are already set in the memory map by the
> > firmware
> > >>   and the firmware is expecting a call to SetVirtualAddressMap to be
> > made.
> > >>   I refrain from mentioning this in the note because this could also be
> > the
> > >>   case on some not-yet-tested firmware on amd64 and it's not a bad
> > >>   recommendation for the general case.
> > >
> > > How does this fit with the recommended installation steps of doing
> > > 'make installkernel' and rebooting before doing a 'make installworld'?
> >
> > Installation of /boot/loader along with likes of cat and cut has always
> > puzzled
> > me very much.
> >
> 
> Historical reason. We've always installed /boot/loader with installworld.
> We also install the other boot loaders, but don't deploy them (so there's a
> new /boot/boot, but it isn't installed into /).

More complete historical information.  The "boot" code use to live in
hidden places in the MBR, and the {disk,bsd}label, so installing it
into the file system had 0 effect, as the actuall in use running
code was hidden and had to be replaced using either fdisk or
{disk,bsd}label.

When "loader" was added this should of probably changed with
preseverations of old code and ways to get back to it incase
things went a foul, and ways to update it in a more controlled
manner than installworld.  And more approprate timing of
installing it (should it now go with installkernel?).
 
> To get around this issue, though, is trivial:
> 
> make installkenrel
> cd stand
> make install
> reboot
> make installworld
> 
> in this weird case.
> 
> Warner

-- 
Rod Grimes                                                 rgrimes at freebsd.org