External booting from ADRV9361-Z7035

Hi,

Let's start with what revision of the SOM and carrier are you using?
Are the switches S1, S3 and S4 in the right position? According to the https://wiki.analog.com/_media/resources/eval/user-guides/adrv9361-z7035/02-038702-01-f2.pdf
Can you make sure that the switches are not half way to the desired position.
If the above are checked, probe the voltages out of the 3 switches.

Andrei

Hi Andrei,

Thank you for your reply.

We are using the ADRV9361-Z7035, (SOM), rev f2 connected to our own carrier in our system. This carrier has a Micro SD card socket to be able to boot the SOM with the external card after setting the SOM S1 to an external card.

Regarding S3, S4, and S1 settings; we are able to boot when the SD card is on the SOM, but not from the carrier. so, we assume that these settings are OK.

The report from the serial port is that Uboot is OK while the RAM boot fails.

The schematic of the SD card on our carrier is using the CM1624 EMI filter and line termination.

All the trace from the JX3 SOM connector to the external SD card socket on the carrier is about 3.3 inches long and they match to about +- 10 mils.

Include the schematic we implement on the carrier board.

Are you aware of a special card type we should use?

Hi,

D_S said:

The report from the serial port is that Uboot is OK while the RAM boot fails.

Have you probed de VCC on the SD card ?

Our suggestions, if possible, are:

1. Test your SD card with the reference design carrier

2. Test with another card 16G or 32G

3. Double check if the filter is mounted in the right position

4. Double check if the SD card lines are routed to the right pins

5. Remove the filter

Andrei

Hello D_S ,

Do you have any updates regarding this?

Regards,
Iulia

Hi,
We removed the CM1624 EMI filter, jumped its pads, + add a pullup resistor to the CMD line and it start to work. We don't fully understand what is wrong with this design.

Thanks,
David

Hello,

As this is not involving some of our parts, it is outside of the support we can offer, and anyway what we're offering is just a reference design that the customers take it and change it to their needs. Thus, this thread can be closed.

Best regards,
Iulia