TMS320C6655: DMA INTERRUPT ISSUE and Flash Boot Query

Thilak Ram

Part Number: TMS320C6655

Tool/software:

EMIF DMA Interrupt Completion Not received Issue :

We have used the chip TMS320C6655CZHA25 and we come across an issue that after initializing the DMA it will run the transfer (EMIF DMA transfer). After completing transfer it has to trigger a transfer complete interrupt event. The event is not triggered. It is OK when one DMA is used but when 2 DMAs are used then we get into the problem.

NOR Flash boot source code compilation from TMS320C6655 PDK source :

We are using NOR flash for booting DSP processor. We can boot from NOR by using NOR writer program to flash the application. We want to implement flash upgrade feature in our application using EMIF ( command based). And integrated the NOR flash writer logic in our source code and NOR driver couldn’t able to detect the NOR Flash.

Sharing the previous thread links that we have posted.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1349359/tms320c6655-edma-access-issue-tms320c6655/5162599?tisearch=e2e-sitesearch&keymatch=%20user%3A529615#5162599

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1308330/tms320c6655-edma-transfer-issue?tisearch=e2e-sitesearch&keymatch=%2520user%253A529615#

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1413990/tms320c6655-unsupported-platform-error-0xc-with-nor-flash-writer-for-mt25q128-device/5422742#5422742

11 months ago

0 Praveen Rao 11 months ago

TI__Mastermind 48243 points

Hello,

The expert looking into this device/platform is out of the office till Oct 25th, so please expect a delay in the response.

Thanks.

0 Shankari G 11 months ago

TI__Mastermind 25535 points

Thilak Ram said:
We have used the chip TMS320C6655CZHA25 and we come across an issue that after initializing the DMA it will run the transfer (EMIF DMA transfer). After completing transfer it has to trigger a transfer complete interrupt event. The event is not triggered. It is OK when one DMA is used but when 2 DMAs are used then we get into the problem.

This use-case is a customized one, which TI support is beyond the scope.

Please approach any third party solution provider.

Regards

Shankari G

0 Thilak Ram 10 months ago in reply to Shankari G

Intellectual 480 points

Hi,

May I know the reason, Why the DMA issue is out of scope of TI. It is basically an issue with completion interrupt of DMA. when one or more DMAs are used.

Also. Please give the response for our second query regarding nor flash driver.

Regards,

Thilak

0 Shankari G 10 months ago in reply to Thilak Ram

TI__Mastermind 25535 points

Thilak,

DMA is not out of scope of TI.

Customer's use case is out of scope here.

And the same answer is applicable for your second query too.

Regards

Shankari G

0 Shankari G 10 months ago

TI__Mastermind 25535 points

Dear Customer,

My response is inlined below.

Thilak Ram said:
We are using NOR flash for booting DSP processor. We can boot from NOR by using NOR writer program to flash the application. We want to implement flash upgrade feature in our application using EMIF ( command based). And integrated the NOR flash writer logic in our source code and NOR driver couldn’t able to detect the NOR Flash.

Response:-

========

For NOR booting, the booting happens via the SPI interface. And this method is called as direct-SPI boot.

Please note, NOR memory is interfaced via SPI and not through EMIF.

Are you successful in booting by following the below FAQ procedure?

[FAQ] TMS320C6657: How to run the direct SPI-BOOT example on TI-C6657-EVM without IBL ? - Processors forum - Processors - TI E2E support forums

And also note, NOR ( or ) NAND-memory shall be interfaced through EMIF too.

But NOR-memory via EMIF is not demonstrated ( by source code examples) in any of the SDK / PDK.

Regards

Shankari G