path: root/Documentation/kernel-parameters.txt
diff options
authorScott Telford <stelford@cadence.com>2016-09-22 16:58:16 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-27 12:54:41 +0200
commitc41251b17563234371a9b376ed4914efa4bc079b (patch)
tree7fa3e64e794043e6184232621af6a7272b46bacc /Documentation/kernel-parameters.txt
parent212d249b6acbe00ac3617938433ce785c2d68e88 (diff)
serial: xuartps: Add some register initialisation to cdns_early_console_setup()
Add initialisation of control register and baud rate to cdns_early_console_setup(), required when running kernel standalone without a boot loader. Baud rate is only initialised when specified in earlycon command-line option, otherwise it is assumed this has been set by a boot loader. Updated Documentation/kernel-parameters.txt accordingly. Signed-off-by: Scott Telford <stelford@cadence.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a4f4d693e2c1..70b51f824a60 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1045,11 +1045,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
determined by the stdout-path property in device
tree's chosen node.
- cdns,<addr>
- Start an early, polled-mode console on a cadence serial
- port at the specified address. The cadence serial port
- must already be setup and configured. Options are not
- yet supported.
+ cdns,<addr>[,options]
+ Start an early, polled-mode console on a Cadence
+ (xuartps) serial port at the specified address. Only
+ supported option is baud rate. If baud rate is not
+ specified, the serial port must already be setup and
+ configured.