TMS570LC4357: Memory Scrubbing via DMA

Florian Boemmel

Part Number: TMS570LC4357

Hi,

we are currently working on a memory scrubbing program for the L2RAMW. We want periodically to read the whole memory to trigger the single bit correction or detect double bit errors.

We wanted to optimize it using the DMA. It it possible to do this with DMA or it is just achievable with a CPU read?

Thanks for your help!

over 1 year ago

+1 jagadish gundavarapu over 1 year ago

TI__Guru 70681 points

Hi Florian,

(+) TMS570LC4357: How to check RAM corruption during runtime. - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Yes, you can use DMA to check the SECDED (Single bit Error Correction and Double bit Error Detection) and if there is any single bit error or double bit error then the corresponding ESM flags will get SET.

--
Thanks & regards,
Jagadish.

0 Florian Boemmel over 1 year ago in reply to jagadish gundavarapu

Prodigy 10 points

Thanks Jagadish!

0 Florian Boemmel over 1 year ago in reply to jagadish gundavarapu

Prodigy 10 points

One more question. We could test successfully the correction of single bit errors in SRAM using DMA. If we use CPU the single bit errors are recorded in the EPC module. Is this also possible when using the DMA?

Until now we could not find a description or something else which could help us in this regards. Thanks in advance.

0 jagadish gundavarapu over 1 year ago in reply to Florian Boemmel

TI__Guru 70681 points

Hi Florian,

Florian Boemmel said:
Until now we could not find a description or something else which could help us in this regards. Thanks in advance.

Agreed it is not mentioned in TRM but all the below threads are saying it is possible:

(+) TMS570LC4357 DMA transfer didn't fail on ECC invalid flash - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

(+) TMS570LC4357: How to check RAM corruption during runtime. - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

(+) TMS570LC4357 and Flash ECC problem - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Florian Boemmel said:
If we use CPU the single bit errors are recorded in the EPC module. Is this also possible when using the DMA?

So, it would be possible.

--
Thanks & regards,
Jagadish.

0 Florian Boemmel over 1 year ago in reply to jagadish gundavarapu

Prodigy 10 points

Hi Jagadish,

thanks for your reply! I found the solution for me in one of your links. I had to enable in the IP1ECCERREN register the field IP1_ECC_KEY. Now I am able to record single bit errors in the EPC via DMA.

0 jagadish gundavarapu over 1 year ago in reply to Florian Boemmel

TI__Guru 70681 points

Florian Boemmel said:
thanks for your reply! I found the solution for me in one of your links. I had to enable in the IP1ECCERREN register the field IP1_ECC_KEY. Now I am able to record single bit errors in the EPC via DMA.

Good to hear that.