docs: Document serial support

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mintsuki 2022-03-02 13:14:11 +01:00
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@ -59,6 +59,7 @@ Some keys take *URIs* as values; these are described in the next section.
*Globally assignable* keys are:
* `TIMEOUT` - Specifies the timeout in seconds before the first *entry* is automatically booted. If set to `no`, disable automatic boot. If set to `0`, boots default entry instantly (see `DEFAULT_ENTRY` key).
* `QUIET` - If set to `yes`, enable quiet mode, where all screen output except panics and important warnings is suppressed. If `TIMEOUT` is not 0, the `TIMEOUT` still occurs, and pressing any key during the timeout will reveal the menu and disable quiet mode.
* `SERIAL` - Enable serial I/O for the bootloader.
* `DEFAULT_ENTRY` - 1-based entry index of the entry which will be automatically selected at startup. If unspecified, it is `1`.
* `GRAPHICS` - If set to `yes`, use a graphical framebuffer for the boot menu, else use text mode. Ignored with Limine UEFI, forced to `yes`.
* `MENU_RESOLUTION` - Specify screen resolution to be used by the Limine menu in the form `<width>x<height>`. This will *only* affect the menu, not any booted OS. If not specified, Limine will pick a resolution automatically. If the resolution is not available, Limine will pick another one automatically. Ignored if `GRAPHICS` is not `yes`.