[PATCH] ppc64: update xmon helptext

xmon will do nothing but noise on a G5 if BOOTX_TEXT is not enabled.
mention the recognized kernel cmdline options for xmon.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Paul Mackeras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/ppc64/Kconfig.debug b/arch/ppc64/Kconfig.debug
index 46b1ce58da3b..f16a5030527b 100644
--- a/arch/ppc64/Kconfig.debug
+++ b/arch/ppc64/Kconfig.debug
@@ -41,10 +41,19 @@ config XMON
         help
           Include in-kernel hooks for the xmon kernel monitor/debugger.
           Unless you are intending to debug the kernel, say N here.
+          Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
+          nothing will appear on the screen (xmon writes directly to the
+          framebuffer memory).
+          The cmdline option 'xmon' or 'xmon=early' will drop into xmon very
+          early during boot. 'xmon=on' will just enable the xmon debugger hooks.
+          'xmon=off' will disable the debugger hooks if CONFIG_XMON_DEFAULT is set.
 
 config XMON_DEFAULT
         bool "Enable xmon by default"
         depends on XMON
+        help
+          xmon is normally disabled unless booted with 'xmon=on'.
+          Use 'xmon=off' to disable xmon init during runtime.
 
 config PPCDBG
         bool "Include PPCDBG realtime debugging"