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Document the upcoming sha256 setting #2597

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Jul 21, 2022
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Document the upcoming sha256 setting #2597

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Document the upcoming sha256 setting
pelwell Jul 21, 2022
aeb7d3e
Clarify what files ares
pelwell Jul 21, 2022
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5 changes: 5 additions & 0 deletions documentation/asciidoc/computers/config_txt/boot.adoc
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Expand Up @@ -163,6 +163,11 @@ Specifies a subdirectory/prefix from which to load overlays - defaults to `overl

NOTE: Unless `+${os_prefix}${overlay_prefix}README+` exists, overlays are shared with the main OS (i.e. `os_prefix` is ignored).

[[sha256]]
=== `sha256`

If set to non-zero, enables the logging of SHA256 hashes for loaded files (the kernel, initramfs, Device Tree .dtb file and overlays), 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.

=== `uart_2ndstage`

Setting `uart_2ndstage=1` causes the second-stage loader (`bootcode.bin` on devices prior to the Raspberry Pi 4, or the boot code in the EEPROM for Raspberry Pi 4 devices) and the main firmware (`start*.elf`) to output diagnostic information to UART0.
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