T2080'DMA fail to to transfer data to peripheral interface space

[GeekFork]

Hi Expert,

I am trying to use T2080's DMA to transfer data to peripheral interface space(e.g UART's FIFO, PCI), but it always raise a "Transfer Error" status and never success. The transfer is Ok between system memory.

It seems that PAMU need to be configured to authorize DMA to access periphyral region. The situation make no change after I do so.

Would you have some suggestions to enable DMA to access peripheral space?

By the way, where I can find the DMA driver code in Linux? I download the mainline Linx 5.5.x, but it seems that this DMA's driver is not included.

Thanks in advance!

-Jerry

[Pavel · Accepted solution]

See the Section 7.3 in SDK 2.0-1703 documentation:

https://www.nxp.com/docs/en/supporting-information/QORIQ-SDK-2.0-IC-REV0.pdf

[GeekFork]

Thanks Pavel for the reply