[U-Boot-Users] u-boot locking ?

Hi,

I have some (basic) question .. 1) Does u-boot lock the block on which it resides by default ? I mean the sector /erase block on which u-boot is there, it will be locked using the block lock bit by default ?

Plafform in question being IXDP 425 with Intel J3 NOR Flash.

2) The flash content changing has to work in block sizes erase - modify - write cyecles only ??

Reason for all this is that we have few boards on which u-boot is getting corrupted (on flash image corruption itself). And so am wondering even if its a noise issue, how can it first cause an unlock of sector before write.

Any help in understanding of above issues will be really appreciated, Regards, Alfred