tree 9c4e6eff847f70160b96f4eb48707792d0acaa67
parent b6135f56afeaa5d5a1e9e060429b6fd1a8f1cd24
author Philipp Wagner <phw@lowrisc.org> 1603888726 +0000
committer Philipp Wagner <mail@philipp-wagner.com> 1603986698 +0000

[otbn] Fix building earl grey with OTBN model

When passing OTBN_MODEL, Earl Grey can be built with the OTBN model
instead of the RTL implementation. This sets DesignScope == "", which in
turn doesn't make the otbn_rf_peek() function available through DPI
as SV export.

To avoid a compile error in this case make otbn_rf_peek() a weak symbol,
and check for its availability at runtime.

Fixes #3929

Signed-off-by: Philipp Wagner <phw@lowrisc.org>