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

[alfred hitch]

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