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bls: describe optional linux-appendroot key #136

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bls: describe optional linux-appendroot key #136

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9 changes: 9 additions & 0 deletions specs/boot_loader_specification.md
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Expand Up @@ -285,6 +285,12 @@ The following keys are recognized:

Example: `options root=UUID=6d3376e4-fc93-4509-95ec-a21d68011da2 quiet`

* `linux-appendroot` is a boolean option that, if set to `yes`, instructs the
boot loader to generate a suitable `root=` parameter and add it to the
Linux kernel command-line prior to any kernel parameters indicated by
the `options` key.
This key is optional and its absence is treated as `no`.

* `devicetree` refers to the binary device tree to use when executing the
kernel. This key is optional.

Expand All @@ -305,6 +311,9 @@ The following keys are recognized:

Example: `architecture aa64`

Boolean arguments may be written as `yes`/`y`/`true`/`t`/`on`/`1`
or `no`/`n`/`false`/`f`/`off`/`0`.

Each boot loader menu entry drop-in snippet must include at least a `linux` or an `efi`
key. Here is an example for a complete drop-in file:

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