[Xen-changelog] [xen-unstable] Console: introduce console=none command line parameter

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
# Date 1327758102 0
# Node ID f8c2cf24a26cc6cdaaad9140e4b1dfc54f07bab3
# Parent  04623ceabb7296a4e3f51401397ecef4febdd659
Console: introduce console=none command line parameter

Currenty, not specifying 'console=<foo>' on the command line causes
Xen to default to 'vga'.  Alternativly, the user can explicitly
specifiy 'console=vga|com1|com2'.

However, there is no way to specify that neither vga nor serial should
be used.  Specifying 'console=' does have the effect that neither vga
nor serial is set up, but at the cost of an "Bad console= option ''"
warning.

Therefore, expliticly support a 'console=none' option which does not
set up vga and does not set up serial, but does not trigger the bad
console warning.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 04623ceabb72 -r f8c2cf24a26c xen/drivers/char/console.c
--- a/xen/drivers/char/console.c        Sat Jan 28 13:40:36 2012 +0000
+++ b/xen/drivers/char/console.c        Sat Jan 28 13:41:42 2012 +0000
@@ -549,6 +549,8 @@
             p++;
         if ( !strncmp(p, "vga", 3) )
             vga_init();
+        else if ( !strncmp(p, "none", 4) )
+            continue;
         else if ( strncmp(p, "com", 3) ||
                   (sercon_handle = serial_parse_handle(p)) == -1 )
         {

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