[src/trunk]: src/sys/arch/amd64/conf explain that a.out never shipped on x86_...

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

details:   https://anonhg.NetBSD.org/src/rev/6b2e67a4515c
branches:  trunk
changeset: 828764:6b2e67a4515c
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Dec 31 03:38:06 2017 +0000

description:
explain that a.out never shipped on x86_64 and put back compat_nomid

diffstat:

 sys/arch/amd64/conf/GENERIC |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r 74ca7520a10b -r 6b2e67a4515c sys/arch/amd64/conf/GENERIC
--- a/sys/arch/amd64/conf/GENERIC       Sun Dec 31 03:29:18 2017 +0000
+++ b/sys/arch/amd64/conf/GENERIC       Sun Dec 31 03:38:06 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: GENERIC,v 1.475 2017/12/10 17:19:48 bouyer Exp $
+# $NetBSD: GENERIC,v 1.476 2017/12/31 03:38:06 christos Exp $
 #
 # GENERIC machine description file
 #
@@ -22,7 +22,7 @@
 
 options        INCLUDE_CONFIG_FILE     # embed config file in kernel binary
 
-#ident         "GENERIC-$Revision: 1.475 $"
+#ident         "GENERIC-$Revision: 1.476 $"
 
 maxusers       64              # estimated number of users
 
@@ -115,11 +115,14 @@
 options        KDTRACE_HOOKS   # kernel DTrace hooks
 
 # Compatibility options
+# x86_64 never shipped with a.out binaries; the two options below are
+# only relevant to 32-bit i386 binaries
 #options       EXEC_AOUT       # required by binaries from before 1.5
+#options       COMPAT_NOMID    # NetBSD 0.8, 386BSD, and BSDI
 
 # NetBSD backward compatibility. Support goes from COMPAT_15 up until
 # the latest release. Note that really old compat (< COMPAT_16) is only
-# useful for 32-bit binaries.
+# useful for 32-bit i386 binaries.
 include        "conf/compat_netbsd15.config"
 
 #options       COMPAT_386BSD_MBRPART # recognize old partition ID