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Subject[PATCH v3 bpf-next 14/14] samples: bpf: README: add preparation steps and sysroot info
Add couple preparation steps: clean and configuration. Also add newly
added sysroot support info to cross-compile section.
samples/bpf/README.rst | 41 ++++++++++++++++++++++++++++++++++++-----
1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
index 5f27e4faca50..d5845d73ab7d 100644
--- a/samples/bpf/README.rst
+++ b/samples/bpf/README.rst
@@ -14,6 +14,20 @@ Compiling requires having installed:
Note that LLVM's tool 'llc' must support target 'bpf', list version
and supported targets with command: ``llc --version``

+Clean and configuration
+It can be needed to clean tools, samples or kernel before trying new arch or
+after some changes (on demand)::
+ make -C tools clean
+ make -C samples/bpf clean
+ make clean
+Configure kernel, defconfig for instance::
+ make defconfig
Kernel headers

@@ -68,9 +82,26 @@ It is also possible to point make to the newly compiled 'llc' or
Cross compiling samples
In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH
-environment variables before calling make. This will direct make to build
-samples for the cross target.
+environment variables before calling make. But do this before clean,
+cofiguration and header install steps described above. This will direct make to
+build samples for the cross target::
+ export ARCH=arm64
+ export CROSS_COMPILE="aarch64-linux-gnu-"
+Headers can be also installed on RFC of target board if need to keep them in
+sync (not necessarily and it creates a local "usr/include" directory also)::
+ make INSTALL_HDR_PATH=~/some_sysroot/usr headers_install
+Pointing LLC and CLANG is not necessarily if it's installed on HOST and have
+in its targets appropriate arm64 arch (usually it has several arches).
+Build samples::
+ make samples/bpf/
+Or build samples with SYSROOT if some header or library is absent in toolchain,
+say libelf, providing address to file system containing headers and libs,
+can be RFS of target board::

-export ARCH=arm64
-export CROSS_COMPILE="aarch64-linux-gnu-"
-make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
+ make samples/bpf/ SYSROOT=~/some_sysroot
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