we've designed our own Carrier-Board for the DART-6UL module. This works very well if the DART-Module boots from internal NAND,
but it does not boot from a sd-card. I get no output in a Terminal on UART1/Debug if the module should boot from sd.
We have done the boot-selection and sd-card connection similar to the Variscite Customboard, and now I have double checked all Connections and can't find a fault. This Dart-Module does boot with this sd-card in the original Customboard.
U-Boot (executed from nand) does also not recognize the sd-card; 'mmcinfo' reports: Card did not responed to voltage select.
Do you have any suggestions? Is there a possibility to debug this behavior and get closer to the problem?
Thanks in advance,