On Wed, Mar 18, 2020 at 09:48:36AM +0100, Michal Simek wrote:
Hi,
long time ago I was playing with switching among consoles. I have two IPs with the same driver where main console is probed and used which is visible via dm tree.
serial 1 [ + ] serial_zynq | |-- serial@ff000000 serial 2 [ ] serial_zynq | |-- serial@ff010000
then I have also dcc which can be also used as a console
serial 0 [ ] arm_dcc |-- dcc
Lastly I have enabled netconsole feature.
I have no problem to switch between serial@ff000000 and nc but I can't switch it to dcc or second instance.
dhcp setenv ncip 192.168.0.105 setenv nc 'setenv stdout nc;setenv stdin nc' setenv dcc 'setenv stdout dcc;setenv stdin dcc' setenv serial0 'setenv stdout serial@ff000000;setenv stdin serial@ff000000' setenv serial1 'setenv stdout serial@ff010000;setenv stdin serial@ff010000' run nc
and then via netconsole
run serial0
works to get back.
Console info is showing only available and registered instances.
ZynqMP> con List of available devices: serial@ff000000 00000007 IO serial 00000003 IO stdin stdout stderr nulldev 00000003 IO nc 00000003 IO
It means the question is how to probe second instance of serial_zynq serial@ff010000 and dcc. I expect when probe is done it will show up in console list and switch is possible.
I found SERIAL_SEARCH_ALL symbol but it is just search not probe.
I am quite sure that it was working in past but not sure if this was before DM but I would like to know how you are doing it/testing it today.
I think the answer is we don't have any tests for multiple consoles to start with, so it's not tested. I'd start by grabbing an old platform and bisect'ing back the years to see when it did last work as the first thing. Sorry!