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Commit 2482a92e authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by H. Peter Anvin
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doc, xen: Mention 'earlyprintk=xen' in the documentation.


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: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@oracle.com


Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 565d956a
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...@@ -754,6 +754,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. ...@@ -754,6 +754,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
earlyprintk= [X86,SH,BLACKFIN] earlyprintk= [X86,SH,BLACKFIN]
earlyprintk=vga earlyprintk=vga
earlyprintk=xen
earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=serial[,ttySn[,baudrate]]
earlyprintk=ttySn[,baudrate] earlyprintk=ttySn[,baudrate]
earlyprintk=dbgp[debugController#] earlyprintk=dbgp[debugController#]
...@@ -771,6 +772,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. ...@@ -771,6 +772,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
The VGA output is eventually overwritten by the real The VGA output is eventually overwritten by the real
console. console.
The xen output can only be used by Xen PV guests.
ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc= [X86,KGDB] Allow early kernel console debugging
ekgdboc=kbd ekgdboc=kbd
......
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