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boot: Avoid magic values in timeout EFI vars

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This commit is contained in:
Jan Janssen
2022-09-06 10:46:27 +02:00
parent 28fda21c85
commit 97f077df05
2 changed files with 51 additions and 10 deletions
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6
docs/BOOT_LOADER_INTERFACE.md
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@@ -31,7 +31,11 @@ variables. All EFI variables use the vendor UUID
* The EFI variable `LoaderConfigTimeout` contains the boot menu timeout
currently in use. It may be modified both by the boot loader and by the
host. The value should be formatted as numeric, NUL-terminated, decimal
string, in UTF-16. The time is specified in µs.
string, in UTF-16. The time is specified in seconds. A value of `menu-force`
will disable the timeout and show the menu indefinitely. If set to `0` or
`menu-hidden` the default entry is booted immediately without showing a menu.
The boot loader should provide a way to interrupt this by for example
listening for key presses for a brief moment before booting.
* Similarly, the EFI variable `LoaderConfigTimeoutOneShot` contains a boot menu
timeout for a single following boot. It is set by the OS in order to request