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docs: Document the 'ucode' kernel option.

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Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
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Rolf Neugebauer 2018-01-15 16:08:45 +00:00
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@ -47,6 +47,10 @@ contain a kernel modules directory. `cmdline` specifies the kernel command line
To override the names, you can specify the kernel image name with `binary: bzImage` and the tar image
with `tar: kernel.tar` or the empty string or `none` if you do not want to use a tarball at all.
Kernel packages may also contain a cpio archive containing CPU microcode which needs prepending to
the initrd. To select this option, recommended when booting on bare metal, add `ucode: intel-ucode.cpio`
to the kernel section.
## `init`
The `init` section is a list of images that are used for the `init` system and are unpacked directly