* Remove the target-board system.
* From now on, we target generic non-x86 architectures
while leveraging fdt when needed.
* ARM mmc images will likely need some post-processing to make
them bootable on individual hardware. (This is actually how
distros like Fedora handle ARM now. The image 'writer' application
is told what hardware the image is for and adds a vendor bootloader
/ SPL / u-boot / etc)
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