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authorPeter Hurley <peter@hurleysoftware.com>2015-04-06 10:52:39 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-10 14:39:54 +0200
commitca782f16ce02e3f4fa2ae28a5ff256ac69f731e2 (patch)
tree98efd55132080341b4d2dd4ad96fc24a99afdc71 /drivers/tty
parent87515772c33ee8a0cc08d984a7d2401eeff074cd (diff)
earlycon: 8250: Document kernel command line options
Document the expected behavior of kernel command lines of the forms: console=uart[8250],io|mmio|mmio32,<addr>[,options] console=uart[8250],<addr>[,options] and earlycon=uart[8250],io|mmio|mmio32,<addr>[,options] earlycon=uart[8250],<addr>[,options] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_core.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 18142ee3c013..422ebea96a64 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -3471,12 +3471,13 @@ static int univ8250_console_setup(struct console *co, char *options)
* @options: ptr to option string from console command line
*
* Only attempts to match console command lines of the form:
- * console=uart<>,io|mmio|mmio32,<addr>,<options>
- * console=uart<>,<addr>,options
+ * console=uart[8250],io|mmio|mmio32,<addr>[,<options>]
+ * console=uart[8250],0x<addr>[,<options>]
* This form is used to register an initial earlycon boot console and
* replace it with the serial8250_console at 8250 driver init.
*
* Performs console setup for a match (as required by interface)
+ * If no <options> are specified, then assume the h/w is already setup.
*
* Returns 0 if console matches; otherwise non-zero to use default matching
*/