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authorKonrad Rzeszutek Wilk2013-02-25 14:54:08 -0600
committerGreg Kroah-Hartman2013-03-03 16:03:34 -0600
commitc53f3a52561e84be62fad7ac1a5e82e5cc678f5d (patch)
treebd8315effcfc1fc7b513a333185e9832aa3e690f /Documentation
parentbf64a63f4b9ba3b895ba1803dc901de1a936ee3f (diff)
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doc, xen: Mention 'earlyprintk=xen' in the documentation.
commit 2482a92e7d17187301d7313cfe5021b13393a0b4 upstream. The earlyprintk for Xen PV guests utilizes a simple hypercall (console_io) to provide output to Xen emergency console. Note that the Xen hypervisor should be booted with 'loglevel=all' to output said information. Reported-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@oracle.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6c723811c0a0..c4cc199e32cb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -754,6 +754,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
754 754
755 earlyprintk= [X86,SH,BLACKFIN] 755 earlyprintk= [X86,SH,BLACKFIN]
756 earlyprintk=vga 756 earlyprintk=vga
757 earlyprintk=xen
757 earlyprintk=serial[,ttySn[,baudrate]] 758 earlyprintk=serial[,ttySn[,baudrate]]
758 earlyprintk=ttySn[,baudrate] 759 earlyprintk=ttySn[,baudrate]
759 earlyprintk=dbgp[debugController#] 760 earlyprintk=dbgp[debugController#]
@@ -771,6 +772,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
771 The VGA output is eventually overwritten by the real 772 The VGA output is eventually overwritten by the real
772 console. 773 console.
773 774
775 The xen output can only be used by Xen PV guests.
776
774 ekgdboc= [X86,KGDB] Allow early kernel console debugging 777 ekgdboc= [X86,KGDB] Allow early kernel console debugging
775 ekgdboc=kbd 778 ekgdboc=kbd
776 779