[U-Boot-Users] NAND "bad block" support

how does the U-Boot solve the "bad block" problem in the NAND flash memory? 1) does the U-Boot have support to 'bad-block table'? If it does, then how do I activate it? 2) does the U-Boot work with JFFS2 (that handles 'bad blocks')?

Sincerely Shai Lifshitz