These options (can be combined) work from the (isolinux/grub) bootprompt:
grml Use default settings (same as just pressing return)
+grml2ram Copy grml's squashfs file to RAM and
+ run from there (compare with 'grml toram')
memtest Run Memtest86+ instead of Linux
fb1280x1024 Use fixed framebuffer graphics (1)
fb1024x768 Use fixed framebuffer graphics (2) [notice: grml's default]
Booting related options:
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-grml toram Copy CD to RAM and run from there
+grml toram Copy the whole CD/medium to RAM and run
+ from there (compare with 'grml2ram')
grml tohd=/dev/hda1 Copy CD to HD partition and run from there
grml fromhd Skip checking for grml on CD-ROM
grml fromhd=/dev/hda1 Boot from previously copied CD-Image
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
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grml ssh=password Set password for user grml and start ssh-server
grml startup=script Start $script instead of grml-quickconfig on startup
-grml nosyslog Do not start syslog-ng
+grml nosyslog Do not start syslog daemon
grml nogpm Disable GPM daemon
grml noconsolefont Disable setting of console font (using consolechars)
grml noblank Disable console blanking
grml tsplash Text based bootsplash
+grml noquick Disable grml-quickconfig startup script
grml small Do not start that many consoles
grml wondershaper=eth0,1000,500 Set up basic traffic shaping
grml services={postfix,mysql,...} Start service(s) which have an init-script (/etc/init.d/)
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)