I have recently been working with u-boot v2016.07 for microblaze architecture and have a couple questions regarding the bad block table generation for a nand flash system. Please note our system is functioning correctly and this post is more to determine exactly what is happening during u-boots scan of the OOB region. We have run multiple pieces of software to determine the bad blocks within our 32GB (8x4GB) nand flash. U-boot catches all of the known bad blocks plus we are finding extras as shown below. Note in below example device 0 had 0 bad blocks. Im assuming the bad blocks it did report are simply reserved. My question is other than storing the bad block table what more do we reserve blocks for with u-boot?

Device 0 bad blocks: 1ff80000 1ffa0000 1ffc0000 1ffe0000 3ff80000 3ffa0000 3ffc0000 3ffe0000 5ff80000 5ffa0000 5ffc0000 5ffe0000 7ff80000 7ffa0000 7ffc0000 7ffe0000 9ff80000 9ffa0000 9ffc0000 9ffe0000 bff80000 bffa0000 bffc0000 bffe0000 dff80000 dffa0000 dffc0000 dffe0000 fff80000 fffa0000 fffc0000 fffe0000

Regards, Carl Rumsey