DMA on SPI bus for Polarfire SoC

[fcuzzocrea]

Is it possible to use DMA on the physical SPI bus on the Polarfire SoC ?

[eppidei]

Hi @fcuzzocrea , that's not possible. the MSS SPI provides a FIFO interface but the Platform DMA engine supports only memory mapped transactions. The way to implement a SPI DMA is to go through the soft SPI in the fabric and access memory using the FIC routes.