Hi,
On 29-03-15 17:55, Karsten Merker wrote:
config_distro_bootcmd.h defines a common boot environment for
multiple platforms. Document the format of the console
environment variable to allow the use of generic boot scripts
on all supported platforms.
Signed-off-by: Karsten Merker mer...@debian.org
Maybe add something that distros are not encouraged to use this ?
At least on Fedora we do not want to use it, as adding
console=${console} to bootargs on systems with both video-output
(e.g. hdmi out) and a serial port will cause boot messages to
only be shown on the serial port as that is where the /dev/console
then points.
Whereas when using the devicetree chosen/stdout-path property (which
can be set either by u-boot or in the dts with the kernel),
the kernel will use both /dev/tty0 (so the hdmi out) and the serial
port pointed to by chosen/stdout as console, showing boot messages
on both, and systemd will still automatically spawn a getty on the
serial console.
Regards,
Hans
---
doc/README.distro |9 +
1 file changed, 9 insertions(+)
diff --git a/doc/README.distro b/doc/README.distro
index 0308a4c..3f7ee85 100644
--- a/doc/README.distro
+++ b/doc/README.distro
@@ -201,6 +201,15 @@ variables be set. Default values for these variables are
often hard-coded into
CONFIG_EXTRA_ENV_SETTINGS in the board's U-Boot configuration file, so that
the user doesn't have to configure them.
+console:
+
+ Mandatory. The default console device to be passed to the Linux kernel.
+
+ The console device is specified in accordance with the guidelines
+ described in Documentation/serial-console.txt in the Linux kernel sources.
+ If the device is a serial port, the console variable must specify the
+ console baudrate in addition to the console device, e.g. ttyS0,115200.
+
fdt_addr:
Mandatory for any system that provides the DTB in HW (e.g. ROM) and wishes
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