[src/trunk]: src/distrib/notes/macppc Change the deprecation notice about ofw...

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/55a2c57f3d5b
branches:  trunk
changeset: 354205:55a2c57f3d5b
user:      he <he%NetBSD.org@localhost>
date:      Wed Jun 07 09:14:32 2017 +0000

description:
Change the deprecation notice about ofwboot.elf to say that it may
still be required in some cases, as observed by some MacMini users.

diffstat:

 distrib/notes/macppc/prep.OPENFIRMWARE |  16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diffs (33 lines):

diff -r 44f443f90bbe -r 55a2c57f3d5b distrib/notes/macppc/prep.OPENFIRMWARE
--- a/distrib/notes/macppc/prep.OPENFIRMWARE    Wed Jun 07 08:45:51 2017 +0000
+++ b/distrib/notes/macppc/prep.OPENFIRMWARE    Wed Jun 07 09:14:32 2017 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: prep.OPENFIRMWARE,v 1.18 2015/05/09 08:13:35 snj Exp $
+.\"    $NetBSD: prep.OPENFIRMWARE,v 1.19 2017/06/07 09:14:32 he Exp $
 .if \*[OF_VERSION_3] \{\
 .
 .Ss2 Updating your BootROM
@@ -746,12 +746,20 @@
 which then loads the kernel.
 .\}
 .(Note
+Despite a note to the contrary in earlier releases that
 .Pa ofwboot.elf
-is obsoleted.  All users should be using
+is obsoleted, that is no longer the case.
+It has been observed that on some newish machines (notably at least
+some Mac Minis), use of
 .Pa ofwboot.xcf
-instead of
+will result in an early kernel panic when loading the GENERIC kernel
+from disk.
+For these machines it appears to be a workaround to use
 .Pa ofwboot.elf
-now.
+instead of
+.Pa ofwboot.xcf
+as the boot loader.
+The root cause for this problem has unfortunately yet to be found.
 .Note)
 .Pp
 The following bootable media are available for loading the bootloader: