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+ Took some fairly significant changes, for one the kernel is no longer
relocated at the start of a boot, instead it sits wherever the user
decides the kernel should sit. Similarly, the initial kernel stack and
page table are stored within the binary, slightly bloating the size
but making it much safer to boot since there's really no chance of us
overwriting the fdt or initrd in memory.
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+ Not bootable quite yet. Among other things, I couldn't
get the current starfive u-boot fork to boot, so
try adding support for booting with precompiled u-boot
via the `go` command. Initial testing with qemu shows that
this should be possible, and if it works, might be useful
in the (far) future with other slightly janky SBCs.
Also, NS16550 is 8250-based, and I'm really only using the base
8250, so rename and add visionfive 2 uart to list of compatibles.
Visionfive 2 is still completely untested.
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+ RELEASE=1 doesn't work for some reason, though
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+ Both kind of go hand in hand, made sense to do both at the same time.
Some parts feel slightly hacky, the loader works by placing everything
on the stack and avoiding global values. Still, seems to work?
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+ Release mode is sort of broken, as lto doesn't work with linker
relaxation and turning the relaxation off causes issues with the jump
from init to kernel (as I've currently implemented it, could probably
be fixed with a manual jump from assembly, I'll add it to my TODO
list)
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