From 2482a92e7d17187301d7313cfe5021b13393a0b4 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 25 Feb 2013 15:54:08 -0500 Subject: 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: H. Peter Anvin Signed-off-by: Konrad Rzeszutek Wilk Link: http://lkml.kernel.org/r/1361825650-14031-2-git-send-email-konrad.wilk@oracle.com Cc: Signed-off-by: H. Peter Anvin --- Documentation/kernel-parameters.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 6c723811c0a..c4cc199e32c 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. earlyprintk= [X86,SH,BLACKFIN] earlyprintk=vga + earlyprintk=xen earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=ttySn[,baudrate] earlyprintk=dbgp[debugController#] @@ -771,6 +772,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. The VGA output is eventually overwritten by the real console. + The xen output can only be used by Xen PV guests. + ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd -- cgit v1.2.3 From a2fd6419174470f5ae6383f5037d0ee21ed9833f Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 25 Feb 2013 15:54:09 -0500 Subject: doc, kernel-parameters: Document 'console=hvc' Both the PowerPC hypervisor and Xen hypervisor can utilize the hvc driver. Cc: Greg KH Signed-off-by: Konrad Rzeszutek Wilk Link: http://lkml.kernel.org/r/1361825650-14031-3-git-send-email-konrad.wilk@oracle.com Cc: Signed-off-by: H. Peter Anvin --- Documentation/kernel-parameters.txt | 2 ++ 1 file changed, 2 insertions(+) (limited to 'Documentation') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index c4cc199e32c..986614df8c0 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -564,6 +564,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. UART at the specified I/O port or MMIO address, switching to the matching ttyS device later. The options are the same as for ttyS, above. + hvc Use the hypervisor console device . This is for + both Xen and PowerPC hypervisors. If the device connected to the port is not a TTY but a braille device, prepend "brl," before the device type, for instance -- cgit v1.2.3