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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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+ Next step, start documenting contents of each file.
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+ I don't fully trust my memory management system yet, so should
probably check the memory regions it gives.
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At least as far as reading memory info, cool.
One issue I have is that .(ro)data is apparently accessed by absolute
addresses, so I need to know at which address the kernel is going to be
loaded. I would prefer completely position independent code, but if
that's not possible then eh.
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+ Added new common/ directory, into which code that should be shared
with init and kernel is to be added. Currently string.c and bytes.c.
Code in common/ should be marked with __weak, so as to allow the arch to
implement a better, more optimised version of the function if
possible/required.
+ Created include/apos/types.h with macros essentially providing the
libc limits.h and stdint.h. At the moment I use gcc/clang predefined
macros for most things.
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