Hi Karsten,

Grub defaults to 1 in your grub config thus i assume that the MMP Kernel get 
started thus NO Serial console since its not configured on the kernel command 
line.

Otherwise strip down the configuration to the bare minimum and configure a 
clean grub serial support configuration.


Something like:

...
# Enable console output via the serial port. unit 0 is /dev/ttyS0, unit 1 is 
/dev/ttyS1...
serial --unit=1 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=15 serial console

default=0
timeout=5 

title Red Hat Enterprise Linux (2.6.32-131.0.15.el6.x86_64) 
        root (hd0,1) 
        kernel /vmlinuz-2.6.32-131.0.15.el6.x86_64 ro console=tty1 
console=ttyS1,115200n8r
        initrd /initramfs-2.6.32-131.0.15.el6.x86_64.img

...

If TTYS1 is not working try ttyS2

Hth
Hajo

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