[Libre-soc-dev] daily kan-ban update 12dec2021

[lkcl]

On December 12, 2021 4:12:20 PM UTC, Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:

>i'm going to have to do some intermediary testing in between as things
>are getting extremely messy.

i now have OP_FETCH_FAILED triggering an MMU LOOKUP, which, due to memory being entirely blank, creates an "invalid" condition.

note i did *not* say "raises an invalid *exception*" because, once again, the MMU itself is *disconnected* from exceptions by virtue of not itself having an Exception Record: LoadStore1 does, and, normally, the LDSTExceptions go down the *PortInterface* path...

... and this is an *instruction* fetch, creating an *instruction* exception.

finding all of these things is... necessary and messy.

l.