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Ard Biesheuvel f29ca8e8b9 BaseTools/Gcc ARM AARCH64: add support for building device tree binaries 
While modern AARCH64 server systems use ACPI for describing the platform
topology to the OS, ARM systems and AARCH64 outside of the server space
mostly use device tree binaries, which are compiled from device tree
source files using the device tree compiler.

Currently, such source files and binaries may be kept in the EDK2 platform
trees, but are not integrated with the build, which means they need to be
kept in sync and recompiled manually, which is cumbersome.

So let's wire up BaseTools support for them: add tool definitions for the
DTC compiler and preprocessor flags that allow these source files to use
FixedPcd expressions and other macros defined by AutoGen.h

This way, a device tree binary can be built from source and emitted into
a FFS file automatically using something like:

  DeviceTree.inf:
    [Defines]
      INF_VERSION    = 0x00010019
      BASE_NAME      = SomePlatformDeviceTree
      FILE_GUID      = 25462CDA-221F-47DF-AC1D-259CFAA4E326 # gDtPlatformDefaultDtbFileGuid
      MODULE_TYPE    = USER_DEFINED
      VERSION_STRING = 1.0

    [Sources]
      SomePlatform.dts

    [Packages]
      MdePkg/MdePkg.dec

  SomePlatform.fdf:
    INF RuleOverride = DTB xxx/yyy/DeviceTree.inf

    [Rule.Common.USER_DEFINED.DTB]
      FILE FREEFORM = $(NAMED_GUID) {
        RAW BIN                |.dtb
      }

where it can be picked at runtime by the DTB loader that may refer to it
using gDtPlatformDefaultDtbFileGuid.

Note that this is very similar to how ACPI tables may be emitted into a
FFS file with a known GUID and picked up by AcpiTableDxe at runtime.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
 		2017-08-31 08:59:00 +01:00
..
XMLSchema BaseTools/Conf/XMLSchema: Reformat XML using Visual Studio 2013 2016-02-19 09:44:32 +08:00
Empty_Package_Information_Data_File.ini Sync BaseTools Branch (version r2271) to EDKII main trunk. 2011-08-26 07:46:26 +00:00
FrameworkDatabase.template Sync EDKII BaseTools to BaseTools project r1971 2010-05-18 05:04:32 +00:00
ReadMe.txt Restoring $WORKSPACE/BaseTools location, as the plan is to deprecate 2007-10-17 01:54:36 +00:00
build_rule.template BaseTools/Gcc ARM AARCH64: add support for building device tree binaries 2017-08-31 08:59:00 +01:00
target.template Sync BaseTool trunk (version r2599) into EDKII BaseTools. 2013-08-23 02:18:16 +00:00
tools_def.template BaseTools/Gcc ARM AARCH64: add support for building device tree binaries 2017-08-31 08:59:00 +01:00

ReadMe.txt

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This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

This directory contains the template files for the next generation of the
EDK II Build infrastructure.  These files will be copied into the WORKSPACE's
Conf directory if and only if the target files do not exist.

These files may be updated frequently.

The XMLSchema directory contains the EDK II Packaging XML definitions.  The
schema may change in the future.  It differs somewhat from the early versions
of the XML Schema.