[Q] Compiled linaro kernel for getting the real thing - how to enable console output?

[matrixritter]

Hello,

I'm trying to get a full-featured debian on the Xoom. First things first...I need a working kernel. Going with the stable source and toolchain from Linaro brought me a successful build and zImage.
Going further with an old post "Got my Xoom running debian native" brought me to a debootstrapped wheezy and generating a initrd.gz.

Then I issued the following:

fastboot flash:raw boot zImage initrd.gz

fastboot reboot

Beside from the Motorola Logo appearing nothing happened. Console output is hardcoded in the kernel, not a module. Playing with some cmdline-arguments (console=tty0...) changed nothing. So, here's my question to the mighty kernel devs: How to you debug your builds? Somebody asked here about a serial console, but got nowhere. Any suggestions are greatly appreciated.