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[cw310] Stub out ENTROPY_SRC, OTBN, USBDEV, disable Ibex features#30496

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[cw310] Stub out ENTROPY_SRC, OTBN, USBDEV, disable Ibex features#30496
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@vogelpi

@vogelpi vogelpi commented Jun 23, 2026

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It has recently become almost impossible to merge any RTL changes due to the CW310 CI issues. This PR stubs out various IP blocks from CW310 builds. This should substantially reduce the area but the resulting bitstream won't be able to run much software. But as we don't run any tests on the CW310 currently, this should be okay.

This is done to save area on the CW310 to alleviate CI pressure. The
CW310 bitstream is not currently used anymore but we still need to build
it for the time being. It is okay to build a non-functional bitstream
though which is the case with the changes in this commit.

Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
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vogelpi commented Jun 23, 2026

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CHANGE AUTHORIZED: hw/top_earlgrey/rtl/autogen/chip_earlgrey_cw310.sv

This PR just touches the CW310 implementation of Earl Grey which we are about to remove anyway.

@vogelpi vogelpi added the CI:Rerun Rerun failed CI jobs label Jun 23, 2026
@github-actions github-actions Bot removed the CI:Rerun Rerun failed CI jobs label Jun 23, 2026
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