[src/trunk]: src/sys/arch/macppc/conf Add comments for OFB_ENABLE_CACHE (does...

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

details:   https://anonhg.NetBSD.org/src/rev/3e3ed504e64f
branches:  trunk
changeset: 571162:3e3ed504e64f
user:      jklos <jklos%NetBSD.org@localhost>
date:      Fri Nov 12 02:23:09 2004 +0000

description:
Add comments for OFB_ENABLE_CACHE (doesn't work on iMacs) and awacs
(causes lockups). OK'd by Tsubai Masanari (port maintainer).

diffstat:

 sys/arch/macppc/conf/GENERIC |  14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diffs (42 lines):

diff -r 7efdb20afee9 -r 3e3ed504e64f sys/arch/macppc/conf/GENERIC
--- a/sys/arch/macppc/conf/GENERIC      Fri Nov 12 01:00:40 2004 +0000
+++ b/sys/arch/macppc/conf/GENERIC      Fri Nov 12 02:23:09 2004 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: GENERIC,v 1.183 2004/11/10 17:54:05 christos Exp $
+# $NetBSD: GENERIC,v 1.184 2004/11/12 02:23:09 jklos Exp $
 #
 # GENERIC machine description file
 # 
@@ -22,7 +22,7 @@
 
 options        INCLUDE_CONFIG_FILE     # embed config file in kernel binary
 
-#ident                 "GENERIC-$Revision: 1.183 $"
+#ident                 "GENERIC-$Revision: 1.184 $"
 
 maxusers       32
 
@@ -249,6 +249,8 @@
 
 # Other  PCI devices
 ofb*   at pci? dev ? function ?        # Generic Open Firmware Framebuffer
+# OFB_ENABLE_CACHE speeds up the console on many machines, but should
+# not be enabled on some older machines, such as the rev. A-D iMacs.
 #options       OFB_ENABLE_CACHE        # Speed up console
 pciide* at pci? dev ? function ? flags 0x0000  # GENERIC pciide driver
 acardide* at pci? dev ? function ?     # Acard IDE controllers
@@ -315,10 +317,10 @@
 zstty* at zsc? channel ?
 mediabay* at obio?
 wdc*   at mediabay? flags 0
-# awacs is disabled because on some systems--e.g., a 350MHz G4 GigE--
-# it may generate interrupt storms, rendering the machine unusable.
-# If you uncomment this, you'll also want to uncomment "audio* at awacs?"
-# below.
+# awacs is disabled because on most systems (7300 - 9600 PowerMacs,
+# many kinds of G4s), very heavy load can cause the machine to lock
+# up. ONLY enable this if your machine is never under heavy load, or
+# you'd rather have audio than worry about occasional lockups.
 #awacs*        at obio?                        # Apple audio device
 #ki2c* at obio?                        # Keywest I2C
 wi*    at obio?                        # AirMac