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authorMarian Balakowicz <m8@semihalf.com>2006-09-07 17:25:40 +0200
committerMarian Balakowicz <m8@semihalf.com>2006-09-07 17:25:40 +0200
commitbaf3124953490b0c954461b66545f37b67f3269d (patch)
tree33ab51d1462e99ad4082e8d7ce4b010d62edfdbd /README
parent5e09054af67d1bf89f59406933fb021390c7534b (diff)
Add documentation on the latest build environment extentions to
the README file.
Diffstat (limited to 'README')
-rw-r--r--README36
1 files changed, 36 insertions, 0 deletions
diff --git a/README b/README
index e0240238b87..a0949f0d9b1 100644
--- a/README
+++ b/README
@@ -2323,6 +2323,26 @@ images ready for download to / installation on your system:
- "u-boot" is an image in ELF binary format
- "u-boot.srec" is in Motorola S-Record format
+By default the build is performed locally and the objects are saved
+in the source directory. One of the two methods can be used to change
+this behavior and build U-Boot to some external directory:
+
+1. Add O= to the make command line invocations:
+
+ make O=/tmp/build distclean
+ make O=/tmp/build NAME_config
+ make O=/tmp/build all
+
+2. Set environment variable BUILD_DIR to point to the desired location:
+
+ export BUILD_DIR=/tmp/build
+ make distclean
+ make NAME_config
+ make all
+
+Note that the command line "O=" setting overrides the BUILD_DIR environment
+variable.
+
Please be aware that the Makefiles assume you are using GNU make, so
for instance on NetBSD you might need to use "gmake" instead of
@@ -2376,6 +2396,22 @@ or to build on a native PowerPC system you can type
CROSS_COMPILE=' ' MAKEALL
+When using the MAKEALL script, the default behaviour is to build U-Boot
+in the source directory. This location can be changed by setting the
+BUILD_DIR environment variable. Also, for each target built, the MAKEALL
+script saves two log files (<target>.ERR and <target>.MAKEALL) in the
+<source dir>/LOG directory. This default location can be changed by
+setting the MAKEALL_LOGDIR environment variable. For example:
+
+ export BUILD_DIR=/tmp/build
+ export MAKEALL_LOGDIR=/tmp/log
+ CROSS_COMPILE=ppc_8xx- MAKEALL
+
+With the above settings build objects are saved in the /tmp/build, log
+files are saved in the /tmp/log and the source tree remains clean during
+the whole build process.
+
+
See also "U-Boot Porting Guide" below.