TMS570 - ECC check

Mr user4642853

I would like to check the whole flash at bootup before executing any further codepiece.

What I currently have is that I enabled:
- Enabled Flash ECC (EDACEN) and tried both modes (EDACMODE)
- Enabled bus Events
- Enabled ECC check in CPU core: ATCM

Then I just read from 0-3Mb the whole flash and I would like to check the FlashWrapper's status and UNC_ERR_ADD register but in case of the ATCM bit is set (core ECC is enabled) I run into a data abort.
If I dont enable th core ECC (just the FlashWrapper's ECC check) I do not see any status or corrupted memory locations (even though the flash is indeed ECC corrupt).

Also tried with using the flash mirror (starting from 0x20000000).

Is there a way to just read the whole flash and check the status bits/values of the flashwrapper registers?

over 10 years ago

0 Bob Crosby over 10 years ago

TI__Guru 72500 points

The ECC is checked in the Cortex R4 CPU so you must enable the ECC in the CPU. You can use the DMA to read the flash, but then you would only detect uncorrectable errors on ESM group 1 channel 5.

0 Mr user4642853 over 9 years ago in reply to Bob Crosby

Intellectual 425 points

Thank you the DMA approach worked the data abort is not thrown.

Additional info: the flash ecc was set (as expected), and not the RAM ecc as you mentioned.

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TMS570 - ECC check