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docs/vc4: Add information on the hw documentation available. 

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7174>
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Eric Anholt 2020-10-15 16:19:51 -07:00 committed by Marge Bot
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docs/drivers/vc4.rst
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@ -285,3 +285,21 @@ you can test a compiler change in this shader-db with::
(cd ../mesa && make install)
./run.py > after
./report.py before after
Hardware Documentation
----------------------
For driver developers, Broadcom publicly released a `specification
<https://docs.broadcom.com/doc/12358545>`__ PDF for the 21553, which
is closely related to the vc4 GPU present in the Raspberry Pi. They
also released a `snapshot <https://docs.broadcom.com/docs/12358546>`__
of a corresponding Android graphics driver. That graphics driver was
ported to Raspbian for a demo, but was not expected to have ongoing
development.
Developers with NDA access with Broadcom or Raspberry Pi can
potentially get access to "simpenrose", the C software simulator of
the GPU. The Mesa driver includes a backend (`vc4_simulator.c`) to
use simpenrose from an x86 system with the i915 graphics driver with
all of the vc4 rendering commands emulated on simpenrose and memcpyed
to the real GPU.