It looks like it is possible to compile U-Boot to ignore the card detection pin.
https://gitlab.com/pine64-org/u-boot/-/b...L2867-2879
https://patchwork.ozlabs.org/project/ubo...inaro.org/
This might be a good default setting since U-Boot would only ever run if there really was a SD card that it is running off of.
https://gitlab.com/pine64-org/u-boot/-/b..._defconfig
https://gitlab.com/pine64-org/u-boot/-/b...L2867-2879
https://patchwork.ozlabs.org/project/ubo...inaro.org/
This might be a good default setting since U-Boot would only ever run if there really was a SD card that it is running off of.
https://gitlab.com/pine64-org/u-boot/-/b..._defconfig