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authorKonrad Rzeszutek Wilk2013-02-25 14:54:08 -0600
committerGreg Kroah-Hartman2013-03-03 16:09:03 -0600
commit9b1d040fee4c82b3c69283cbb8a4d2a1dc062a21 (patch)
treeed6ee1ad6841a28e0bc7e256ecbf2a3772e45449
parent85fed56cdbc7973f34524ee9efa885ef66e4d831 (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>
-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 397ee05132a..019569d24ce 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -679,6 +679,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
679 679
680 earlyprintk= [X86,SH,BLACKFIN] 680 earlyprintk= [X86,SH,BLACKFIN]
681 earlyprintk=vga 681 earlyprintk=vga
682 earlyprintk=xen
682 earlyprintk=serial[,ttySn[,baudrate]] 683 earlyprintk=serial[,ttySn[,baudrate]]
683 earlyprintk=ttySn[,baudrate] 684 earlyprintk=ttySn[,baudrate]
684 earlyprintk=dbgp[debugController#] 685 earlyprintk=dbgp[debugController#]
@@ -696,6 +697,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
696 The VGA output is eventually overwritten by the real 697 The VGA output is eventually overwritten by the real
697 console. 698 console.
698 699
700 The xen output can only be used by Xen PV guests.
701
699 ekgdboc= [X86,KGDB] Allow early kernel console debugging 702 ekgdboc= [X86,KGDB] Allow early kernel console debugging
700 ekgdboc=kbd 703 ekgdboc=kbd
701 704