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Two basic variables should be available for the compilation scripts:

• TOOLCHAIN_DIR
• KERNDIR

Hence, export them before running the build script:

export KERNDIR=FULL_PATH_TO_COMPILED_LINUX_KERNEL
export TOOLCHAIN_DIR=FULL_PATH_TO_TOOLCHAIN_BIN_DIRECTORY

For example:

export KERNDIR=~/root-fs-x86/src/linux/
export TOOLCHAIN_DIR=~/clovis_2015_lk4_4/buildtools/i686-nptl-linux-gnu

Run scripts/build.sh <Scripts dir> <BCM SDK path> <Install dir path>. For example:

scripts/build.sh ./scripts . /tmp/bcm_sdk_artifacts

The full example is:

cd ~/projects/bcm_sdk
export KERNDIR=~/root-fs-x86/src/linux/
export TOOLCHAIN_DIR=~/clovis_2015_lk4_4/buildtools/i686-nptl-linux-gnu
scripts/build.sh ./scripts . /tmp/bcm_sdk_artifacts

The build artifacts are found under ./build directory. The below command may be used to print the important files:

find build/ -not -type d -not -name "*.P" -not -name "*.cmd" -not -name "*.force" -not -name "*.sig" -not -name "*.order" -not -name "*.mod" -not -name "*.tree" -not -name "*.d" -not -name "*.o" -not -name "*.c" -not -name "*.h" | sort | vim -

Also, take a look at the scripts/copy_artifacts.sh script that copied the needed build artifacts to the designated place.

When upgrading BCM SDK verify the below:

• Merge the changes done in the file from previous SDK: Makefile.linux-x86-generic-common-2_6
• Change maxpayload to 128 (bytes) at linux-kernel-bde.c (~line 148)
• Merge changes in src/appl/diag/system.c (#ifdef by Jayant) within diag_shell()