Serial console not working

Lluís Vilanova vilanova at ac.upc.edu
Tue Dec 22 15:37:47 CET 2015


Adam Lackorzynski writes:

> On Mon Dec 21, 2015 at 23:03:59 +0100, Lluís Vilanova wrote:
>> Hi there! I'm trying to find out why my setup is not booting on a real machine
>> (some Dell PowerEdge R210 node; ned says it cannot find rom/l4re), but I'm
>> unable to redirect output to the serial console.
>> 
>> I'm able to use the serial console for both grub and linux, so it's not a
>> hardware issue. An excerpt of my grub2 configuration:
>> 
>> serial --unit=1 --speed=115200 --word=8 --parity=no --stop=1
>> terminal_input serial
>> terminal_output serial
>> # ...
>> # for the linux entry
>> linux   /vmlinuz-3.16.0-4-amd64 root=UUID=7573ed62-a910-4b97-a577-dde47a16f87a ro console=ttyS1,115200n8 quiet
>> 
>> Now, here's the entry I'm using for L4, which never gets me any output on the
>> serial console:
>> 
>> menuentry 'Test' {
>> set root=(hd0,1)
>> multiboot /l4/bootstrap -serial
>> module /l4/fiasco -serial_esc -comspeed 115200 -comport 1
>> module /l4/sigma0
>> module /l4/moe rom/test.cfg
>> module /l4/l4re
>> module /l4/ned
>> module /l4/test.cfg
>> module /l4/bin/test
>> }

> For GRUB2, the the config needs to look like this:

>    menuentry 'Test' {
>      set root=(hd0,1)
>      multiboot /l4/bootstrap bootstrap -serial
>      module /l4/fiasco fiasco -serial_esc -comspeed 115200 -comport 1
>      module /l4/sigma0 sigma0
>      module /l4/moe moe rom/test.cfg
>      module /l4/l4re l4re
>      module /l4/ned ned
>      module /l4/test.cfg test.cfg
>      module /l4/bin/test test
>    }

> I.e. the first argument is the path where GRUB2 finds the file, the
> second is the path that is presented to the OS. comspeed and comport are
> the default so you can leave them out.

Boots like a charm, Adam (although serial console is still not working).

Thanks a lot,
  Lluis



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