AR 2023-10-04

Another version for Architecture Review. Does not yet address all the Sdtrig feedback.

What's Changed

• Address review comments on debug_defines.h by @en-sc in #876
• Fix debugger examples: use transfer with write by @timsifive in #886
• AR: List which extensions were considered. by @timsifive in #881
• dscratch[01] are DXLEN bits wide. by @timsifive in #885
• AR: Clarify unimplemented Sdtrig. by @timsifive in #879
• AR: Clarify mcontext/hcontext. by @timsifive in #882
• AR: Remove Message Registers. by @timsifive in #878
• AR: tcontrol.mie applies to all traps, not just breakpoints by @timsifive in #880
• Clean up Makefile a little by @timsifive in #887
• AR: Clarify section/chapter in Sdext. by @timsifive in #895
• AR: Clarify why icount matches on every trap. by @timsifive in #896
• AR: Clarify what tmexttrigger.intctl is for by @timsifive in #898
• AR: Define mcontrol* triggers and multiple accesses by @timsifive in #883
• AR: Clarify triggers and multiple state changes by @timsifive in #899

Full Changelog: ar20230914...ar20231004