i.MX ProcessorsのトピックRe: Question, i.MX6 SDMA/ loading script fails

Question, i.MX6 SDMA/ loading script fails

Aemj — Fri, 07 Mar 2014 05:16:24 GMT

Hi all,

I would like to ask about SDMA initialization.

My customer is trying to use SDMA with Freescale i.MX6 SDK.

The issue is;

Loading script fails in the initialization process for SDMA.

The sdma_load_init_script() function in sdma.c, which is included in your SDK, returns FALSE.

He found the SDMA_FLAGS_BUSY bit in sdma_envp->chan0BD.mode was not cleared and then returned FALSE at the line#99 in sdma_load_init_script().

This phenomenon means “Done” bit in buffer descriptor keeps 1 after completion of transfer, right?

According to the description in Table-55-49 in i.MX6DQ reference manual, D=1 indicates the SDMA has not yet processed in the case of channel 0.

Do you have any ideas about the cause of this issue?

Thanks,

Miyamoto

Re: Question, i.MX6 SDMA/ loading script fails

Aemj — Mon, 24 Mar 2014 14:49:32 GMT

Hi All,

I am still waiting someone's response.

If anyone have a supplemental document which can be helpful for better understanding about SDMA handling, please provide!

BR,

Miyamoto

Re: Question, i.MX6 SDMA/ loading script fails

karina_valencia — Thu, 03 Apr 2014 14:09:31 GMT

RobinGong Apr 2, 2014 2:47 AM (in response to jamesbone)

Hi James,

I have no source code in SDK, so I'm not sure whether SDMA_FLAGS_BUSY means "DONE"=1. Yes, it's abnormal if "DONE" always keep 1, which means SDMA NOT finish transfer or there is some error. But I suppose your BD setting are ok. No any SDMA transfer complete successfully or only someone?