Mox does not boot with the provided image

[rhn]

Using the image:

https://github.com/tmshlvck/turris-debian/releases/download/bullseye-20211018/mox-sdimg-20211017.tar.gz

I reformatted an SD card with ms-dos partition table and ext4 FS using gparted.

Then I extracted the data with sudo tar -xf.

After I insert the SD card and plug in the power, the following happens:

• the Ethernet leds on module A blink
• the many Ethernet leds on the 4-port module blink
• the red LED on the A module lights up

When I plug in a cable attached to another device, no LEDs light up on any port, no network activity, can't ping 192.168.0.1 or 192.168.1.1.

The hardware is the Mox Shield.

[rhn]

I'm willing to download and try out a raw SD card image, including the partition table and everything.

[tmshlvck]

Do you have 1.8V UART to connect it to the serial port so you can have a look at the serial output?

TBH I do not have Shield HW and I left CZ.NIC before it even started development so I do not know if there is any additional cryptographic check of the image or something that would make it substantially different from plain MOX, which happily boots any kernel you provide on SD-card (though the U-Boot is cryptographicaly protected, so you can not compile and replace it with your own even there).

I will try to drop an e-mail to @miska to give us some insights.

[rhn]

I have 3.3V UART and different stuff lying around. Can you recommend a 1.8V UART or level shifter to build or easily buy?

[tmshlvck]

Well, I have some random Aliexpress 1.8V USB-UART for years, so I do not really have a pointer.

If you want to make a level-shifter, I believe that 1.8V TX should be good enough for 3.3V RX. To convert 3.3V to 1.8 I think a resistor divider should do the trick. I do not have specific numbers but I would probably try two 10k or 4k7 resistors in series between 3V3 TX and GND and taping the ~1.75V output between them.

And here is pinout https://docs.turris.cz/hw/serial/