I want to expand on one network port using DM368, and use DM368 as a router.
The solution is using a USB PHY , with the DM368 network port itself ,could constitute two Ethernet ports. After the system running up, it can identify the two network port， but when the two NIC transfer at the same time， the USB PHY will dropped .Then DMA is open.
If I put the kernel USB DMA disable , two Ethernet ports can transfer data at the same time without dropped.
So is not suspected DMA conflict? And how to fix it? ? THX
Add: If USB PHY work alone ,it is OK even DMA enable.