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TM4C1290NCPDT: Can not erase a flash sector

Diego Greco
Prodigy 30 points
Part Number: TM4C1290NCPDT
Other Parts Discussed in Thread: UNIFLASH,

Tool/software:

Hi,

I have a problem with the Erase entire flash.
I'm using Uniflash but also CodeComposerStudio to flash and debug.

I noticed that a memory flash portion can not be erase.
The TM4C1290NCPDT has 1024KB flash (from 0x00000 to 0xFFFFF).
I wrote some data in the address 0xFFFF0 but now I can't erase it anymore.




I tried the erase Entire Flash. Then I tried the Erase by address.
Then I tried to use CodeComposerStudio to erase and flash a new firmware in that address but nothing happened.
I verified that the FMPPEn and FMPREn register are in default state. They have 0xFFFF value.

So now I can't use this flash portion. 

Do you have any suggestion to solve this issue?

Thanks & Regards.

Diego Greco