From 6278f55ba5ed20f486ea2049da0cf9a9c1d9a5d5 Mon Sep 17 00:00:00 2001 From: Gustavo Romero Date: Wed, 14 Aug 2019 15:56:37 -0500 Subject: [PATCH] powerpc: Document xmon options Document all options currently supported by xmon debugger. Signed-off-by: Gustavo Romero Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190814205638.25322-1-gromero@linux.ibm.com --- Documentation/admin-guide/kernel-parameters.txt | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 7ccd158..6d495aa 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5305,3 +5305,22 @@ A hex value specifying bitmask with supplemental xhci host controller quirks. Meaning of each bit can be consulted in header drivers/usb/host/xhci.h. + + xmon [PPC] + Format: { early | on | rw | ro | off } + Controls if xmon debugger is enabled. Default is off. + Passing only "xmon" is equivalent to "xmon=early". + early Call xmon as early as possible on boot; xmon + debugger is called from setup_arch(). + on xmon debugger hooks will be installed so xmon + is only called on a kernel crash. Default mode, + i.e. either "ro" or "rw" mode, is controlled + with CONFIG_XMON_DEFAULT_RO_MODE. + rw xmon debugger hooks will be installed so xmon + is called only on a kernel crash, mode is write, + meaning SPR registers, memory and, other data + can be written using xmon commands. + ro same as "rw" option above but SPR registers, + memory, and other data can't be written using + xmon commands. + off xmon is disabled. -- 2.7.4