31 Jan
2011
31 Jan
'11
8:17 a.m.
Dear Albert ARIBAUD, Simon Guinot,
Here is the protect area map for a MX25L4005A 4Mb flash:
bit 2 1 0 | protect level____________|_______________ 0 0 0 | none 0 0 1 | block 7 0 1 0 | block 6-7 0 1 1 | block 4-7 1 * * | all
Block size is 64KB. The compiled U-Boot image is about 220KB and environment is 4KB. So, 4 blocks are required for U-Boot.
I don't know your particular hardware, but is not u-boot (or the initial bootloader if there is any) fetched from the *beginning* of the flash?
If so, you would have to *hardware* protect the *entire* flash.
In this case, a *software* protection mechanism like for NOR flash would be a better choice.
Best Regards, Reinhard