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Repeating options

The effect of repeating boot command-line options depends on the options. gif There are three possible behaviours:

Options that only enable or disable a certain functionality can be repeated any number of times. debug, lock, no-hlt, and no387 fall into this category.

Other options change a global setting whenever they appear, so only the value or presence of the last option matters. The antagonists ro and rw are such options. Also, ramdisk, root, and vga work this way. Example: ro rw would mount the root file system read-write.

Finally, when reserve and many device-specific options are repeated, each occurrence has its own meaning, e.g. hd= hd= would configure two hard disks, and reserve=0x300,8 reserve=0x5f0,16 would reserve the ranges 0x300 to 0x307 and 0x5f0 to 0x5ff (which is equivalent to writing reserve=0x300,8,0x5f0,16).



Ross Biro
Sat May 20 13:51:22 PDT 1995