Hi Fiona, On Tue, May 14, 2024 at 5:28 PM Fiona Klute <fiona.kl...@gmx.de> wrote: > > This adds details that I would have liked to have readily available, > in particular how to activate the network interface before enabling > netconsole, and how to integrate netconsole so you can use the U-Boot > prompt. > > Signed-off-by: Fiona Klute <fiona.kl...@gmx.de> > --- > doc/usage/netconsole.rst | 33 ++++++++++++++++++++++++++++++++- > 1 file changed, 32 insertions(+), 1 deletion(-) > > diff --git a/doc/usage/netconsole.rst b/doc/usage/netconsole.rst > index 2aa3b9ccc5..0c983e6970 100644 > --- a/doc/usage/netconsole.rst > +++ b/doc/usage/netconsole.rst > @@ -18,7 +18,9 @@ broadcast address and port 6666 are used. If it is set to > an IP > address of 0 (or 0.0.0.0) then no messages are sent to the network. > The source / listening port can be configured separately by setting > the 'ncinport' environment variable and the destination port can be > -configured by setting the 'ncoutport' environment variable. > +configured by setting the 'ncoutport' environment variable. Note that > +you need to set up the network interface (e.g. using DHCP) before it > +can be used for network console. > > For example, if your server IP is 192.168.1.1, you could use:: > > @@ -107,3 +109,32 @@ as follows: > > Note that unlike the U-Boot implementation the Linux netconsole is > unidirectional, i. e. you have console output only in Linux. > + > +Setup via environment > +--------------------- > + > +If persistent environment is enabled in your U-Boot configuration, you > +can configure the network console using the environment. For example:: > + > + => env set autoload no > + => env set hostname "u-boot" > + => env set bootdelay 5 > + => env set nc 'dhcp; env set stdout nc; env set stdin nc'
We would need "env set stderr nc" here, too. All the best, Tony > + => env set ncip 192.168.1.1 > + => env set preboot "${preboot}; run nc;" > + => env save > + => reset > + > +``autoload no`` tells the ``dhcp`` command to configure the network > +interface without trying to load an image. ``hostname "u-boot"`` sets > +the hostname to be sent in DHCP requests, so they are easy to > +recognize in the DHCP server log. The command in ``nc`` calls ``dhcp`` > +to make sure the network interface is set up before enabling > +netconsole. > + > +Adding ``nc`` to ``preboot`` tells U-Boot to activate netconsole > +before trying to find any boot options, so you can interact with it if > +desired. > + > +``env save`` stores the settings persistently, and ``reset`` then > +triggers a fresh start that will use the changed settings. > -- > 2.43.0 >