[src/trunk]: src sun2 kernel is restricted to ~2MB due to bootloader.

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

details:   https://anonhg.NetBSD.org/src/rev/905665f82f8b
branches:  trunk
changeset: 969979:905665f82f8b
user:      rin <rin%NetBSD.org@localhost>
date:      Sun Mar 08 06:23:18 2020 +0000

description:
sun2 kernel is restricted to ~2MB due to bootloader.
It seems that working kernel should be more smaller.

Strip off most kernel options, and provide by kernel modules.
Also add GENERIC kernel for NFS root instead of FFS.

diffstat:

 etc/etc.sun2/Makefile.inc  |   4 ++--
 sys/arch/sun2/conf/GENERIC |  29 +++++++++++++++++------------
 sys/arch/sun2/conf/NFS     |  10 ++++++++++
 3 files changed, 29 insertions(+), 14 deletions(-)

diffs (98 lines):

diff -r 15c391761939 -r 905665f82f8b etc/etc.sun2/Makefile.inc
--- a/etc/etc.sun2/Makefile.inc Sun Mar 08 06:12:01 2020 +0000
+++ b/etc/etc.sun2/Makefile.inc Sun Mar 08 06:23:18 2020 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.inc,v 1.7 2007/07/24 10:49:28 pavel Exp $
+#      $NetBSD: Makefile.inc,v 1.8 2020/03/08 06:23:18 rin Exp $
 #
 #      etc.sun2/Makefile.inc -- sun2-specific etc Makefile targets
 #
@@ -6,7 +6,7 @@
 # If you change the list of distributed kernels, don't forget
 # to update the release documentation in distrib/notes/common/contents
 
-KERNEL_SETS=           GENERIC FOURMEG DISKLESS
+KERNEL_SETS=           GENERIC FOURMEG DISKLESS NFS
 
 EXTRA_KERNELS=         INSTALL
 
diff -r 15c391761939 -r 905665f82f8b sys/arch/sun2/conf/GENERIC
--- a/sys/arch/sun2/conf/GENERIC        Sun Mar 08 06:12:01 2020 +0000
+++ b/sys/arch/sun2/conf/GENERIC        Sun Mar 08 06:23:18 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: GENERIC,v 1.102 2019/04/26 22:46:04 sevan Exp $
+# $NetBSD: GENERIC,v 1.103 2020/03/08 06:23:18 rin Exp $
 #
 # GENERIC machine description file
 # 
@@ -23,11 +23,16 @@
 
 include        "arch/sun2/conf/std.sun2"
 
+options        MODULAR                 # new style module(7) framework
+#options       MODULAR_DEFAULT_AUTOLOAD
+options        INSECURE                # allow modload(8) in multiuser mode
+
 #options       INCLUDE_CONFIG_FILE     # embed config file in kernel binary
 
-#ident                 "GENERIC-$Revision: 1.102 $"
+#ident                 "GENERIC-$Revision: 1.103 $"
 
-makeoptions    COPTS="-Os"     # optimize for size
+makeoptions    COPTS="-Os -fno-inline-small-functions"
+                                       # bootloader has size limit (~2MB)
 
 # Machines to be supported by this kernel
 #options       FPU_EMULATE
@@ -37,12 +42,12 @@
 
 # Standard system options
 options        KTRACE          # system call tracing
-options        SYSVMSG         # System V message queues
-options        SYSVSEM         # System V semaphores
-options        SYSVSHM         # System V shared memory
+#options       SYSVMSG         # System V message queues
+#options       SYSVSEM         # System V semaphores
+#options       SYSVSHM         # System V shared memory
 #options       INSECURE        # disable kernel security level
 #options       USERCONF        # userconf(4) support
-#options       PIPE_SOCKETPAIR # smaller, but slower pipe(2)
+options        PIPE_SOCKETPAIR # smaller, but slower pipe(2)
 #options       SYSCTL_INCLUDE_DESCR    # Include sysctl descriptions in kernel
 
 # Alternate buffer queue strategies for better responsiveness under high
@@ -73,15 +78,15 @@
 
 # Filesystem options
 file-system    FFS             # Berkeley Fast Filesystem
-file-system    NFS             # Sun NFS client support
-file-system    CD9660          # ISO 9660 + Rock Ridge file system
+#file-system   NFS             # Sun NFS client support
+#file-system   CD9660          # ISO 9660 + Rock Ridge file system
 #file-system   FDESC           # /dev/fd/*
-file-system    KERNFS          # /kern
-file-system    NULLFS          # loopback file system
+#file-system   KERNFS          # /kern
+#file-system   NULLFS          # loopback file system
 #file-system   OVERLAY         # overlay file system
 #file-system   PROCFS          # /proc
 #file-system   UNION           # union file system
-file-system    MFS             # memory-based filesystem
+#file-system   MFS             # memory-based filesystem
 file-system    PTYFS           # /dev/pts/N support
 #file-system   TMPFS           # Efficient memory file-system
 #file-system   UDF             # experimental - OSTA UDF CD/DVD file-system
diff -r 15c391761939 -r 905665f82f8b sys/arch/sun2/conf/NFS
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/sun2/conf/NFS    Sun Mar 08 06:23:18 2020 +0000
@@ -0,0 +1,10 @@
+# $NetBSD: NFS,v 1.1 2020/03/08 06:23:18 rin Exp $
+#
+# GENERIC machine description file for NFS root instead of FFS
+
+# Supports Sun2 (2/120, 2/170, 2/50, ...)
+# Supports root on: ie0, sd*, ...
+
+include        "arch/sun2/conf/GENERIC"
+no file-system FFS
+file-system    NFS