Hey people i'm wondering if someone knows how to crack the bootloader via kexec, and that if you know, so may u help me,
I guess there is no answer because people were waiting for the penny to drop and you realise your question is somewhat foolish. A google search, a forum search or reading the forum stickies would have made it clear that the Milestone bootloader is locked.
If you have any further questions regarding this then refer to the sticky Motorola "Milestone" the smart-phone with a clear limitation!
kexec is an IDEA not finished project. An idea how to crack the bootloader, one that has a very good potencial to succeed, here is the wiki that has kexec and other Milestone bootloader cracker methods.
motorola_milestone [And Developers]
But we probably won't need kexec anyway, read all abaut it here:
Thoughts on custom roms, experimental project