i.MX ProcessorsのトピックRe: NXP DDR test tool

NXP DDR test tool

faridmousavi — Wed, 14 Dec 2022 22:21:51 GMT

Hello everyone,

I'm trying to use the mscale ddr tool for an i.MX 8M Plus SOM board I designed, but I get the error "Can't open USB device, Please check if the correct target is selected and set to the serial download mode".

I have checked the power rail and all voltages are available.

I'm using an off the shelf FTDI232 converter connected with jumper wires to UART2, with voltage levels translated to that of the converter (3.3V) as seen in the schematic.

I've connected with jumper wires:

UART_RXD_FT to TXD
UART_TXD_FT to RXD
GND to GND
3V3_FT to VCC

I ran the software in administrator mode.

I have placed my i.MX board in serial download mode.

I have monitored the COM port connected to my i.MX board, and one byte is received each time I reset the board, so I guess serial communication is established and the clock is working.

Does anyone have any ideas on what to try next?

Re: NXP DDR test tool

Zhiming_Liu — Thu, 15 Dec 2022 01:32:36 GMT

Please check if you have installed the FTDI232 windows driver. You should remove GND and 3V3 connection.

Re: NXP DDR test tool

faridmousavi — Thu, 15 Dec 2022 19:08:55 GMT

I don't think that the serial communication circuit is the problem. I placed the board in "Boot from SD card" and placed an SD card with a u-boot image (just for testing, I didn't expect it to work), and I got the following log over the COM port:

This proves that the serial communication is established and the CPU is logging over the UART port, and I'm able to receive the logs properly.

One think I noticed is that in "serial download mode" when I select my script and click on "Download", I do not see the TX LED blink. I don't know if I should expect it to blink or not, but I thought it's worth pointing out.