| commit | 4366c82aeac764b6ef936c154f76c30a00ed5c78 | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Wed Mar 24 07:44:43 2021 +0000 |
| committer | Michael Schaffner <msf@google.com> | Mon Apr 19 15:04:23 2021 -0700 |
| tree | 4509c310f28d0fce42f8df8bc20c4cac9e0885e4 | |
| parent | 051be79e93e0808f52f7ceb7c277856141bc9c73 [diff] |
[rom_ctrl] A script to scramble a ROM image This takes a 32-bit ELF file as input (something like the boot_rom_sim_verilator.elf that we already create as part of the SW build). It pads the file up to the expected ROM size with pseudo-random data, adds ECC checksum bits, extending to 40 bits in width and then scrambles the result, writing out a VMEM file at the end. This is not yet a complete solution because we don't calculate the expected digest for the top 8 bytes (at the moment, they are all zero). We'll come back to that once we have a proper model of the interaction between rom_ctrl and the KMAC block. As well as code to load a 32-bit ELF and write a 40-bit VMEM file, this commit also has code to load VMEM files because the initial version of this patch consumed e.g. boot_rom_sim_verilator.32.vmem. The problem is that the build process has already zero-padded this file internally, which we don't want, so we have to load the (segmented) ELF instead. However, the VMEM loading code works and might be useful soon, so I've left it in for now. Signed-off-by: Rupert Swarbrick <rswarbrick@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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