OrangePi Zero + SPI-boot + SD card


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You dont want uboot on the SD, it has higher priority than the spi so the spi boot hook will never get triggered with a valid uboot on the sd.

 

The way I did this with an Allwinner board with an A25Q128FV 128Mbit chip was to put the kernel with an embedded rootfs onto the spi. Boot spi kernel+rootfs image, decrypt sd, change root, continue sd boot process. I used buildroot to create the kernel+rootfs image which was about 9MB.

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