TMS570LC4357: Flash Erasing with Fapi_BlockErase bad(?) Values

Joe Cassara

Part Number: TMS570LC4357

If I call:

uint32 result = Fapi_BlockErase(0x00200000, 16U); // as Fapi_BlockErase() function is defined in bl_flash.c from bootloader example

The erase succeeds, but not all of the values become 0xFFFFFFFF:

Question: Is this expected behavior?

FYI: I'm assuming the erase succeeds despite this, because my call to Fapi_BlockProgram()Fapi_BlockProgram() immediately after does succeed and writes the correct test values:

Thank you for your guidance!

over 3 years ago

+1 QJ Wang over 3 years ago

TI__Guru**** 197706 points

Hi Joe,

It is expected behavior. When you erase the flash, the corresponding ECC space is also erased to 0xFFFFFFFF which is not a valid ECC value for flash content=0xFFFFFFFF. When CCS memory browser the flash content, the ECC logic will try to correct the 1-bit ECC error.

You can use linker cmd script to program the ECC for the whole flash.

https://software-dl.ti.com/hercules/hercules_docs/latest/hercules/How_to_Guides/index.html

Here is my example of linker cmd script:

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/1541.HL_5F00_sys_5F00_link.cmd

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TMS570LC4357: Flash Erasing with Fapi_BlockErase bad(?) Values