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| author | Gregory Fong <gregory.0xf0@gmail.com> | 2015-02-04 03:49:26 +0100 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2015-02-27 22:54:55 +0100 |
| commit | dce12391d70d24d428def2f5fc600a3b1f791ca6 (patch) | |
| tree | b2bf6217ace4b44017982185d0d294e1b78616d8 /Documentation/arm/Booting | |
| parent | Linux 4.0-rc1 (diff) | |
| download | linux-dce12391d70d24d428def2f5fc600a3b1f791ca6.tar.xz linux-dce12391d70d24d428def2f5fc600a3b1f791ca6.zip | |
Documentation: arm: Update for DT-only platforms
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>
Diffstat (limited to 'Documentation/arm/Booting')
| -rw-r--r-- | Documentation/arm/Booting | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/arm/Booting b/Documentation/arm/Booting index 371814a36719..83c1df2fc758 100644 --- a/Documentation/arm/Booting +++ b/Documentation/arm/Booting @@ -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 ------------------ |