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authorSimon Glass <sjg@chromium.org>2014-12-01 17:34:02 -0700
committerSimon Glass <sjg@chromium.org>2015-01-14 21:16:53 -0800
commit620053421c1a346259bcd07db08c54cca99349ac (patch)
treea2d08bf3ab7c67d1b065887649aa739339882e92 /tools
parent346996969de74b18562e58a98788d93cc026a7e5 (diff)
downloadtalos-obmc-uboot-620053421c1a346259bcd07db08c54cca99349ac.tar.gz
talos-obmc-uboot-620053421c1a346259bcd07db08c54cca99349ac.zip
buildman: Add documentation about the .buildman file
This file is only partially documented. Add some more details. Signed-off-by: Simon Glass <sjg@chromium.org> Suggested-by: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'tools')
-rw-r--r--tools/buildman/README73
1 files changed, 53 insertions, 20 deletions
diff --git a/tools/buildman/README b/tools/buildman/README
index 34c338ed9d..865390a6f3 100644
--- a/tools/buildman/README
+++ b/tools/buildman/README
@@ -141,8 +141,8 @@ $ git clone git://git.denx.de/u-boot.git .
$ git checkout -b my-branch origin/master
$ # Add some commits to the branch, reading for testing
-2. Create ~/.buildman to tell buildman where to find tool chains. As an
-example:
+2. Create ~/.buildman to tell buildman where to find tool chains (see 'The
+.buildman file' later for details). As an example:
# Buildman settings file
@@ -675,28 +675,61 @@ It is common when refactoring code for the rodata to decrease as the text size
increases, and vice versa.
-Providing 'make' flags
-======================
+The .buildman file
+==================
+
+The .buildman file provides information about the available toolchains and
+also allows build flags to be passed to 'make'. It consists of several
+sections, with the section name in square brackets. Within each section are
+a set of (tag, value) pairs.
+
+'[toolchain]' section
+
+ This lists the available toolchains. The tag here doesn't matter, but
+ make sure it is unique. The value is the path to the toolchain. Buildman
+ will look in that path for a file ending in 'gcc'. It will then execute
+ it to check that it is a C compiler, passing only the --version flag to
+ it. If the return code is 0, buildman assumes that it is a valid C
+ compiler. It uses the first part of the name as the architecture and
+ strips off the last part when setting the CROSS_COMPILE environment
+ variable (parts are delimited with a hyphen).
+
+ For example powerpc-linux-gcc will be noted as a toolchain for 'powerpc'
+ and CROSS_COMPILE will be set to powerpc-linux- when using it.
+
+'[toolchain-alias]' section
+
+ This converts toolchain architecture names to U-Boot names. For example,
+ if an x86 toolchains is called i386-linux-gcc it will not normally be
+ used for architecture 'x86'. Adding 'x86: i386' to this section will
+ tell buildman that the i386 toolchain can be used for x86.
+
+'[make-flags]' section
+
+ U-Boot's build system supports a few flags (such as BUILD_TAG) which
+ affect the build product. These flags can be specified in the buildman
+ settings file. They can also be useful when building U-Boot against other
+ open source software.
+
+ [make-flags]
+ at91-boards=ENABLE_AT91_TEST=1
+ snapper9260=${at91-boards} BUILD_TAG=442
+ snapper9g45=${at91-boards} BUILD_TAG=443
-U-Boot's build system supports a few flags (such as BUILD_TAG) which affect
-the build product. These flags can be specified in the buildman settings
-file. They can also be useful when building U-Boot against other open source
-software.
+ This will use 'make ENABLE_AT91_TEST=1 BUILD_TAG=442' for snapper9260
+ and 'make ENABLE_AT91_TEST=1 BUILD_TAG=443' for snapper9g45. A special
+ variable ${target} is available to access the target name (snapper9260
+ and snapper9g20 in this case). Variables are resolved recursively. Note
+ that variables can only contain the characters A-Z, a-z, 0-9, hyphen (-)
+ and underscore (_).
-[make-flags]
-at91-boards=ENABLE_AT91_TEST=1
-snapper9260=${at91-boards} BUILD_TAG=442
-snapper9g45=${at91-boards} BUILD_TAG=443
+ It is expected that any variables added are dealt with in U-Boot's
+ config.mk file and documented in the README.
-This will use 'make ENABLE_AT91_TEST=1 BUILD_TAG=442' for snapper9260
-and 'make ENABLE_AT91_TEST=1 BUILD_TAG=443' for snapper9g45. A special
-variable ${target} is available to access the target name (snapper9260 and
-snapper9g20 in this case). Variables are resolved recursively. Note that
-variables can only contain the characters A-Z, a-z, 0-9, hyphen (-) and
-underscore (_).
+ Note that you can pass ad-hoc options to the build using environment
+ variables, for example:
-It is expected that any variables added are dealt with in U-Boot's
-config.mk file and documented in the README.
+ SOME_OPTION=1234 ./tools/buildman/buildman my_board
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