TDA4VH-Q1: Does the wave5 driver allow me to access the high-end address and the low-end address at the same time?

enguo.shan

Part Number: TDA4VH-Q1

SDK: 8.6

I have a question, can you help me? I don't have a manual for wave5, so I can only ask questions on e2e

Today. I use v4l2 dma to input encoding buf (this buf is allocated in low-end memory), but found that the encoding result is not correct.

Through debugging.

I found that my current wave5 driver uses the high-end address, but the input dma buf low-end address, and then I set W5_CMD_EXT_ADDR to 0. it will be successful

But I am worried that this modification will affect the use of wave5's own allocated memory? Is the scope of influence of W5_CMD_EXT_ADDR global?

Or is there a way for me to access the high-end address and the low-end address at the same time?

over 2 years ago

0 Brandon Brnich over 2 years ago

TI__Expert 3800 points

Hello,

You are correct in that recent releases set the CnM driver to use high memory. This was a design decision that had to be made in order to utilize the full capabilities of the device. The problem with this is that if high mem is being used, you cannot switch between using high mem and low mem. There is a register that must be programed at boot time of the device and cannot be changed once it is written to. This address is responsible for holding the base addr for which memory ranges the device will use.

Changing the value that you did will have a global impact on the driver because now it will be restricted to only low mem. Unfortunately, you can only use one or the other, not both.

Best,

Brandon

0 enguo.shan over 2 years ago in reply to Brandon Brnich

Intellectual 325 points

Thanks for answering. Is there no other way? I want to use the zero-copy method to encode the image from tiovx

0 Brandon Brnich over 2 years ago in reply to enguo.shan

TI__Expert 3800 points

Hello Enguo,

In 9.0 the tiovx components have been updated to use high memory as well so the zero-copy method for encoding is supported. Unfortunately, the only way to do this in 8.6 would be to revert the changes made for the CnM driver to use high memory. Doing this would force everything back to low mem.

Thanks,

Brandon

0 enguo.shan over 2 years ago in reply to Brandon Brnich

Intellectual 325 points

Thank u. i understand

0 enguo.shan over 2 years ago in reply to Brandon Brnich

Intellectual 325 points

I also want to ask a question. If I change TIOVX to high address on SDK8.6. How to modify it. Is there a related patch?

0 Brandon Brnich over 2 years ago in reply to enguo.shan

TI__Expert 3800 points

Hello Enguo,

I have asked the developers about this and it is not a simple effort to enable this in 8.6 SDK. It would take quite a bit of effort and there is not a patch we offer for that at this time.

Thanks,

Brandon

0 enguo.shan over 2 years ago in reply to Brandon Brnich

Intellectual 325 points

Thank u. i understand

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TDA4VH-Q1: Does the wave5 driver allow me to access the high-end address and the low-end address at the same time?