Document the upcoming sha256 setting #2597
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The next rpi-update and apt firmware packages add the sha256 setting, enabling the logging of hashes for loaded files.
lurch
reviewed
Jul 21, 2022
| [[sha256]] | ||
| === `sha256` | ||
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| If set to non-zero, enables the logging of SHA256 hashes for loaded files, as generated by the `sha256sum` utility. The logging output goes to the UART if enabled, and is also accessible via `sudo vcdbg log msg`. This option may be useful when debugging booting problems, but at the cost of potentially adding _many_ seconds to the boot time. Defaults to 0 on all platforms. |
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Is it worth clarifying what "loaded files" this is referring to? From the mention of vcdbg I assume it's the boot files (start.elf etc.?) loaded by the VideoCore, rather than anything loaded onto the ARM?
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You'd be wrong. It won't cover start.elf because that's loaded by the 2nd stage loader and the logging is generated by start.elf itself. It's for the kernel, initramfs, device tree and overlays. It does sound like it needs idiotproofing.
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We should definitely turn idiotproofing on by default in GitHub,.
lurch
approved these changes
Jul 21, 2022
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The next rpi-update and apt firmware packages add the sha256 setting, enabling the logging of hashes for loaded files.