Serial console not working

Lluís Vilanova vilanova at
Tue Dec 22 19:18:09 CET 2015

Lluís Vilanova writes:

> 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 the record, I've fixed it by moving the serial console arguments to
bootstrap. There was a message on the console admonishing of the change, which I
saw when booting with QEMU.


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