How to change ethernet phy address in Mbed for NXP i.MX RT1050 EVKB eval board?

Mbed OS
,
1

I’m doing prototype work on an NXP i.MX RT1050 EVKB board. Our custom board will be slightly different in that the ethernet Phy address of enet port 0 will be 0x00 instead of 0x02.

Our electrical engineer just told me about this change and I believe it has to do with this portion of the schematic.

image
image1837×1642 255 KB

Where in the mbed OS source tree do I change the ethernet phy addr from 0x02 to 0x00?

I’ve looked through the various NXP EVK target sources and drivers and I just can’t determine how to do this.

Any help would be greatly appreciated.

2

Hello Jim,

The Ethernet Phy address seems to be defined in the mbed-os/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/device.h file as follows:

#define BOARD_ENET_PHY_ADDR    (2)

This macro is then used in the file mbed-os/connectivity/drivers/emac/TARGET_NXP_EMAC/TARGET_IMX/imx_emac.cpp as follows:

...
void Kinetis_EMAC::phy_task()
{
    uint32_t phyAddr = BOARD_ENET_PHY_ADDR;
...

You can modify the BOARD_ENET_PHY_ADDR macro to:

#define BOARD_ENET_PHY_ADDR    (0)

either in the device.h when you define your custom target or directly in the mbed-os if you don’t plan to define a custom target.

3

Thanks again my friend! I was looking in all the wrong places.