pxeboot: make the tftp loader use the option root-path directive

pxeboot in tftp loader mode (when built with LOADER_TFTP_SUPPORT) now
prefix all the path to open with the path obtained via the option 'root-path'
directive.

This allows to be able to use the traditional content /boot out of box. Meaning
it now works pretty much like all other loaders. It simplifies hosting hosting
multiple version of FreeBSD on a tftp server.

As a consequence, pxeboot does not look anymore for a pxeboot.4th (which was
never provided)

Note: that pxeboot in tftp loader mode is not built by default.

Reviewed by:	rpokala
Relnotes:	yes
Sponsored by:	Gandi.net
Differential Revision:	https://reviews.freebsd.org/D4590

1 files changed, 6 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index b020439..52ce52a 100644
--- a/UPDATING
+++ b/UPDATING
@@ -31,6 +31,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20151216:
+	The tftp loader (pxeboot) now uses the option root-path directive. As a
+	consequence it no longer looks for a pxeboot.4th file on the tftp
+	server. Instead it uses the regular /boot infrastructure as with the
+	other loaders.
+
 20151211:
 	The code to start recording plug and play data into the modules has
 	been committed. While the old tools will properly build a new kernel,