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Documentation: arm: Update for DT-only platforms

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The documentation specified that a machine type is mandatory and made
that assumption in a few places.  However, for DT-only platforms, the
current advice is that no machine type should be registered, so update
accordingly.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Gregory Fong
2015-02-03 18:49:26 -08:00
committed by Jonathan Corbet
parent c517d838eb
commit dce12391d7
2 changed files with 18 additions and 6 deletions
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9
Documentation/arm/Booting
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@@ -58,13 +58,18 @@ serial format options as described in
--------------------------
Existing boot loaders: OPTIONAL
New boot loaders: MANDATORY
New boot loaders: MANDATORY except for DT-only platforms
The boot loader should detect the machine type its running on by some
method. Whether this is a hard coded value or some algorithm that
looks at the connected hardware is beyond the scope of this document.
The boot loader must ultimately be able to provide a MACH_TYPE_xxx
value to the kernel. (see linux/arch/arm/tools/mach-types).
value to the kernel. (see linux/arch/arm/tools/mach-types). This
should be passed to the kernel in register r1.
For DT-only platforms, the machine type will be determined by device
tree. set the machine type to all ones (~0). This is not strictly
necessary, but assures that it will not match any existing types.
4. Setup boot data
------------------