you my friend have a worn out FLASH chip
Diaganosis
I got a failed HMI from work where the HMI looks to be locked up which was only displaying the LOGO screen, uploading anything in application mode fails and trying to erase the flash in Download mode fails. My Guess is that its a worn out flash chip, so i’m going to try an remove/test and replace it.
I’ve seen the same wear issue in https://blog.hegars.com/?p=1403 which is usally caused by excessive writes by logging.
Trying to erase
Downloader Mode
Set device to Downloader Mode
NBManager
In NBManager
System Operation
Write the new Kernel works fine (which blocks does it reside?)
Write Root File System
Error Management Details
“Over time, some memory locations may fail to program or erase properly. In order to
ensure that data is stored properly over the life of the NAND Flash device, the following
precautions are required”
Flash Areas
Blocks
Block 0 – 0x0 thru 0x20fff
Times 1024 blocks
extending to 0x83fffff
OTP
0x0 thru 0xf77f
Uniquie ID
0x0 thru 0x1f
Replacing Flash
Ordering
Desoldering
Reading Chip
New Chip FOB,
Might need to upgrade to the T56 to get the OPT scction done.