12-08-2020, 06:50 AM
It sounds like your issue is that the U-boot on your eMMC is hosed. You'll need to disable the eMMC, boot to SD, and switch the eMMC back on very early during booting to be able to fix it.
Get Debian from the link in the blog here. If that works, and it should, that's your best bet on the SD. If it doesn't boot, I'm not sure what to tell you. Once booted, if you turned on the eMMC at the right time, you should be able to copy the U-boot code from the SD to the eMMC, and assuming the operating system is still intact, the eMMC should return to normal operation.
Get Debian from the link in the blog here. If that works, and it should, that's your best bet on the SD. If it doesn't boot, I'm not sure what to tell you. Once booted, if you turned on the eMMC at the right time, you should be able to copy the U-boot code from the SD to the eMMC, and assuming the operating system is still intact, the eMMC should return to normal operation.