TMS570LS3137: Unable to export Flash

There is no problem for uniflash to export flash content to a file. This is my test. 

Just noticed that the uniflash is not able to read data from your flash at 0xAD640. 

I should have been more specific. Im not sure why it keeps failing to read 0xAD640

Is the content at 0xAD640 displayed in the memory browser? Is the content a valid data?

What is the content at this address after the flash is erased?

This is after using UNIFLASH to erase:

After the program image is located to flash, the program starts execution. If the flash ECC is enabled, reading a location which has a invalid ECC value will generate an error or data abort. 

From your screenshot, your code size is 0xAD640. Beyond this address, the flash content is 0xFFFFFFFF, and the ECC value is also 0xFFFFFFFF which is not valid ECC value for flash data. So you got failed when you tried to export the data from the unused flash memory. 

If flash ECC is not enabled in your code, you won't see this issue. You can disable the Flash ECC by commenting out the below instruction in sys_startup.c:

//    _coreEnableFlashEcc_();

You can calculate and program the ECC for the whole flash memory using Linker cmd file, so you can read the unused flash location and won't get ECC error.

Refer to this link to learn how to generate ECC using Linker CMD file:

http://software-dl.ti.com/hercules/hercules_docs/latest/hercules/How_to_Guides/HowToGuides.html

In our software we use the Fapi_issueAsyncCommandWithAddress function to erase certain sectors. After erasing sectors this way how can we read those memory locations because no new ECC is loaded. I think using uniflash to erase also loads a new ecc.