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[mailbox,dv] Add the block-level DV document - #771
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A few small things then it looks good to me :)
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Describe the verification strategy for the mailbox: the testbench and the origin of each component, the stimulus, the coverage model mapped to the vPlan features, the scoreboard, interrupt and assertion checks, and how to run the tests. Add the testbench block diagram. Signed-off-by: Martin Velay <mvelay@lowrisc.org>
The vPlan scenario request_response had no testpoint. Add it at V2, since it relies on the interrupt checks that come with the other V2 testpoints. Signed-off-by: Martin Velay <mvelay@lowrisc.org>
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Looks good to me, thanks!
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Third part of the mailbox block-level DV (#173), following #767.
hw/ip/mailbox/dv/README.md, the block-level DV document, with the testbench block diagram indoc/tb.svg. It describes the target environment: components and their origin, stimulus, the coverage model mapped to the vPlan features, the scoreboard, interrupt and assertion checks, and how to run the tests.mailbox_request_response, for the vPlan scenario that had none.The AXI agent extension it relies on is tracked in #762, and the protocol assertions in #169.