I think we can pretty much confirm it’s not using the front port. Per the description on the v2 patchset that add initial device-tree of EIC7700 to upstream linux:
Hi Pinkesh,
Thank your for the patches!
Should this not be marked dma-noncoherent to avoid having to mark each
peripheral as such?Thanks for your feedback.
We have not added “dma-noncoherent” because there are no DMA-capable peripherals in the devicetree yet.
We planned to add this later when we add any DMA capable devices
i.e. sdhci, gmac, sata, pcie, spi.Do you recommend to add this property in current version?
IIRC, all those DMA capable peripherals are dma-noncoherent.