Cherry PUMA SOM-RK3399-Q7 User Manual page 42

5.5.6 Ethernet PHY
The Micrel KSZ9031RNX is connected to the CPU via RGMII and MDIO. Further connections are shown below.
PHY signal Connected to
RESET CPU pin GPIO3_C0
MDIO CPU pin GPIO3_B5
MDC CPU pin GPIO3_B0
LED1 Qseven GBE_LINK1000 and GBE_LINK100 and GBE_LINK (tied together)
LED2 Qseven GBE_ACT
5.5.7 Test points
v1.6
Page 38
Test point Connected to
TP1 STM32 USART2 TX
TP2 STM32 USART2 RX
TP3 GND
Linux GPIO #
112
107
102