I ended up patching the u-boot source code used
by https://github.com/RobertCNelson/Bootloader-Builder to switch the boot
target search order from mmc0, legacy_mmc0, mmc1, legacy_mmc1 to mmc1,
legacy_mmc1, mmc0, legacy_mmc0. Then I wrote the MLO and SPL images to the
image so they get used duri
I've got a custom board with SYSBOOT boot order set to always prefer the
onboard eMMC (MMC1) over the SD card (MMC0), but after initial flash of the
eMMC it always boots from the SD card if it is present.
I'm speculating that SPL is loaded from MMC1 as I expect but then it is
using MMC0 as the
