I found a solution to my problem: /boot/grub/menu.lst. There is a section called ## Start Default Options ## where we can define additionnal variables about different kernels options.
I put these lines: # kopt=root=/dev/sda1 ro quiet # kopt_2_6_22=root=/dev/hda1 ro quiet (kernel 2.6.22-3-686 was the only one in menu.lst) This way, when update-grub is called, /boot/grub/menu.lst is updated according to the kernel. Thus, the default kernel option is "root=/dev/sda1 ro quiet" (for kernel 2.6.24 and subsequent) while the kernel option for kernel 2.6.22 is "root=/dev/hda1 ro quiet". Now, I can experiment different kernel compilations (implying update-grub) and always have good entries (sda1/hda1) in menu.lst. Hubert
