Hello,
We have designed a new board with an am625 with an Intel Cyclone-10 FPGA connected to the GPMC, as a follow-on module from a design utilising am am335x SoC with the same FPGA.
I have managed to get the GPMC interface running and I am able to read and write memory-mapped registers correctly over the GPMC.
In our am335x design we utilised the XDMA_EVENT_INTR0 line to signal the am335x that there was data available in the FIFO's and that triggered a DMA transfer.
I am struggling to understand the architecture of the DMA in the am62x, but as far as I can figure out, I should be using the BCDMA module which is functionally similar to EDMA in the am335x.
In our am62x design we have routed the GPIO1_15 signal to the FPGA signal indicating data is available, and I understand that in the am62x that any GPIO may be utilized to trigger DMA transfers.
I do not find any examples in the device tree of the kernel I am currently using which is the ti-linux-kernel on branch ti-linux-5.10.y commit b28123e3a3c358bfcce6a82795a9980cd0ec9496 illustrating how configure BCDMA nor how to configure a GPIO to trigger a DMA transfer using BCDMA.
Any assistance would be greatly appreciated.
Hamish
