You will need to know your kernel base address. Now I don't have all of the base addresses for all the phones, but I do have the four I normally work with when developers need me to check their boot image. This part is very important, as using the wrong base address will cause your phone not to boot (and you'll have to restore back from a recovery image).
Hero CDMA (heroc), Hero GSM (hero)
Base Address: 0x19200000
Command Line: "no_console_suspend=1 console=null"
Desire (bravo), Nexus One (passion)
Base Address: 0x20000000
Command Line: "no_console_suspend=1 msmsdcc_sdioirq=1 wire.search_count=5"
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