Is it possible to boot from HDD

[Alex_Tomin]

Sorry, if this question is stupid - i'm new to *nix,
But i really interested is it possible to boot from hdd, in flash leave only commands for switch boot device?

[al37919]

http://wl500g.dyndns.org/
http://wl500g.info/showthread.php?t=6339
http://wpkg.org/index.php/Running_Debian_on_ASUS_WL-500G_deluxe