FWIW---and this is probably already known by must---I found that:
"The RISC-V reader: an open architecture atlas", by David Patterson
and Andrew Waterman, Strawberry Canyon LLC, ISBN 9780999249116
to be a great help to "put things together"---I mean it is a short book
(a hundred of pages excluding appendices) giving a kind of "root tree"
about hardware/software considerations, with comparisons with other
architectures; root tree on which one can "mount" various pieces of
information he had picked up here and there (elsewhere), so that the
whole picture can take shape. (It is not a text book or a high
level: you can start programming for RISC-V with this.)
If some read this list to try to get into kernel, this is perhaps a
possible reference to add to the books you could or should read.
FWIW,
--
Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
http://www.kergis.com/
http://kertex.kergis.com/
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