MPC5200b MMC over SPI into PSC6

[Fabri]

> Doesn't look like you are passing a kernel parameters line.  The
> kernel probably is booting, but doesn't know where to output the
> console.  Try adding "console=ttyPSC0,115200".

Hi Grant,
I've tried to add that with this commands

=> bootargs debug console=ttyPSC0,115200 root=/dev/ram
=> saveenv

but the result is not so different. It still stops after printing these lines

>Linux/PowerPC load: debug console=ttyPSC0,115200 root=/dev/ram
>Finalizing device tree... flat tree at 0x75e300

What should I see after that, in case of successful boot?
Thanks for your help.