>As far as I can tell, I made a bootable microSD without ever touching das U-Boot.
But you did, your aborted dd, 16MB since spi chip is 128Mb
idbloader at 64 sectors, uboot at 8M, ATF (maybe) at 12M, user partitions at 16M, 32768 sectors
It fooled me too, nothing to do with syslinux despite the same name
Just another interface to uboot, instead of boot.txt/boot.scr or uEnv.txt/boot.something/boot.scr (armbian)
You can try to get boot selection,, from odroid forum
https://forum.odroid.com/viewtopic.php?t=26894
Let us know how it works out
Great to get slack going
Please note,, some uboots do NOT flip boot order, chip default is spi, emmc, uSD, usb for program load
If emmc is before uSD, you can not boot uSD
But you did, your aborted dd, 16MB since spi chip is 128Mb
idbloader at 64 sectors, uboot at 8M, ATF (maybe) at 12M, user partitions at 16M, 32768 sectors
It fooled me too, nothing to do with syslinux despite the same name
Just another interface to uboot, instead of boot.txt/boot.scr or uEnv.txt/boot.something/boot.scr (armbian)
You can try to get boot selection,, from odroid forum
https://forum.odroid.com/viewtopic.php?t=26894
Let us know how it works out
Great to get slack going
Please note,, some uboots do NOT flip boot order, chip default is spi, emmc, uSD, usb for program load
If emmc is before uSD, you can not boot uSD