| commit | a711a6acfc3c9eee28fe3ac80ef9474bf429db44 | [log] [tgz] |
|---|---|---|
| author | Sam Elliott <selliott@lowrisc.org> | Thu Jul 23 12:27:32 2020 +0100 |
| committer | Sam Elliott <sam@lenary.co.uk> | Tue Jul 28 23:00:49 2020 +0100 |
| tree | 3ecdbefe6c3caa462863a371bc7ad0725eccfb22 | |
| parent | a07394dc003f7aae87beb8d1e983b5ec087e5266 [diff] |
[mask rom] More Detailed Boot Pseudo-code This is based off discussions we had in the meeting, and comments on the previous PR (lowrisc/opentitan#2937), and a few private discussions. The main change to the pseudo-code is the explicit handling of multiple rom_ext manifests in a priority order (and the possibility of the boot policy aborting boot of the primary rom_ext, but continuing with subsequent rom_exts). Another big change here is to document which parts of mask rom execution can only happen after a ROM_EXT has been verified. Verifying this signature is not the final thing the mask rom does. Explicit stages have been added to cover: - Enabling any software-enabled memory protection, which covers SRAM scrambling and if the software has to set up PMP regions (both of which are still open questions). - Manufacturing boot-strapping process. I have also tried to clarify how I see the split between the assembly that cleans the device state and the C code which cleans the remaining device state. I have also done some markdown cleanups. Signed-off-by: Sam Elliott <selliott@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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