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:
------------------------
-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