Debugging related settings:
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-debug Get shells during process of booting
+debug Get shells during process of booting, using GNU screen
+grml debug=noscreen Get shells during process of booting, but without using GNU screen
grml nocolor Disable colorized output while booting
grml log Log error messages while booting and
grml testcd Check CD data integrity and md5sums
grml swraid Enable automatic assembling of software raid arrays
grml nolvm Disable scanning for Logical Volumes (LVM)
grml lvm Automatically activate Logival Volumes (LVM) during boot
-grml scandelay[=seconds] Delay accessing ISO-device (useful for booting via usb/firewire)
grml cdrom=/dev/... Use specifed device as CD-ROM device (used for mounting the grml-ISO)
grml xmodule=ati|fbdev|i810|mga Use specified X.org-Module (1)
grml xmodule=nv|radeon|savage|s3 Use specified X.org-Module (2)