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I connected a B+ with a serial cable to my PC. Before I have changed in the config.txt the console from


to


as explained here. But the only thing I see during boot is


The initrd does not honor the boot parameter. How can I fix this?

You're following the instructions for Cubox-I

Quote:CuBox-I
cmdline paramaters

Edit the /boot/boot.src.txt file and run /boot/mks afterwards.

I don't believe there is an option for Serial Console on the Raspberry Pi.

It does but it has to be enabled in the kernel (unsure if it is), I have never gotten it to work.

http://elinux.org/RPi_Serial_Connection

I'm using one of these:

https://www.fasttech.com/p/1230400

CONFIG_SERIAL_AMBA_PL011_CONSOLE

is enabled for RPI kernels. so should work.
(even have a very weak feeling someone was using that. because remember discussion how to make it permanent (for ttyX)).

Thanks for confirming mk01