I have managed to install mainline u-boot on my 5B. i copied the 5It boots from both MMC and the SD. To boot from the sd, you have to interrupt the boot process and tell it to boot from MMC0. the default boot order is:
mmc1 mmc0 nvme scsi usb pxe dhcp spi
I've tried a number of things to correct the issue but none worked. In the aliases section of rk3588s-orangepi-5b.dts, I had to device sdchi as MMC0 (it really is MMC1). Not it boots like it should. Is there a better way to get u-boot to boot from SD card first?
Thanks!
