| commit | c7f04c70d036b190493ef8a6d2abda08f8145645 | [log] [tgz] |
|---|---|---|
| author | Philipp Wagner <phw@lowrisc.org> | Wed Aug 18 20:03:09 2021 +0200 |
| committer | Philipp Wagner <mail@philipp-wagner.com> | Fri Aug 27 14:16:18 2021 +0200 |
| tree | b9a69b38f7e143dc786a2340953900b6f9a318aa | |
| parent | b1188efa846db46c84db392861be27319f4c81c5 [diff] |
[otbn] Introduce locked state Introduce a new locked state, represented as LOCKED in the STATUS register to indicate if OTBN has detected a fatal error and is now "dead" until a reset. With this new state, OTBN guarantees a certain value of the STATUS register after a fatal error was detected, simplifying the documentation and the verification. Furthermore, operation handling from Ibex got easier even if fatal alerts don't reach Ibex for whatever reason: an operation always returns with a done interrupt, and reading the STATUS register clearly indicates what happened to OTBN. (Before, software would have to read FATAL_ALERT_CAUSE as well if STATUS was non-zero to check if an operation can be restarted [in case of a recoverable error], or if OTBN is locked.) Signed-off-by: Philipp Wagner <phw@lowrisc.org>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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