[RFC] add riscv support

[Robert Schwebel]

On Thu, Oct 13, 2016 at 12:11:27PM +0300, Antony Pavlov wrote:
> This patch adds initial RISC-V architecture support for barebox.

Great to see this; could you add some documentation? We have a nice
documentation framework in the meantime. Most of your cover letter could
for example go into the docs.

rsc
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