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doc: set PKG_CONFIG_LIBDIR and disable bpf lib for DPDK cross-build

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Without PKG_CONFIG_LIBDIR restricted to arm64 packages, meson picks up
x86 libelf and the link fails with "file in wrong format".  Disable the
bpf library (-Ddisable_libs=bpf) to drop the libelf dependency entirely
since it is not needed for the fronthaul use case.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Raymond Knopp <raymond.knopp@eurecom.fr>
This commit is contained in:
Raymond Knopp
2026-05-23 18:00:41 +00:00
parent bc91687122
commit 7c06beb3cb
1 changed files with 8 additions and 6 deletions
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14
doc/dragonwing-build.md
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@@ -284,20 +284,22 @@ wget http://fast.dpdk.org/rel/dpdk-24.11.4.tar.xz # K release
tar xf dpdk-24.11.4.tar.xz
cd dpdk-stable-24.11.4
PKG_CONFIG_LIBDIR=/usr/lib/aarch64-linux-gnu/pkgconfig \
meson setup build-dragonwing \
--cross-file ~/aarch64-dragonwing.ini \
--prefix=$HOME/dw-sysroot \
-Dplatform=generic \
-Ddisable_drivers=net/ice,net/i40e,net/iavf,net/ixgbe # trim x86 NICs
-Ddisable_libs=bpf \
-Ddisable_drivers=net/ice,net/i40e,net/iavf,net/ixgbe
ninja -C build-dragonwing
ninja -C build-dragonwing install
```
> **Note:** `--prefix=$DW_SYSROOT` keeps the ARM DPDK entirely separate from
> any x86 DPDK you may have installed system-wide. The `-Ddisable_drivers`
> list is optional; remove it if you need those PMDs or if the build fails.
> DragonWing-specific DPDK PMDs (e.g. `net/nfp` or vendor-provided ones) can
> be added with `-Denable_drivers=...`.
> **Note:** `PKG_CONFIG_LIBDIR` replaces (not appends) the pkg-config search
> path, ensuring meson finds arm64 `.pc` files rather than x86 ones.
> `-Ddisable_libs=bpf` drops the libelf dependency, which is not needed for
> fronthaul use. The `-Ddisable_drivers` list trims x86-only NIC drivers;
> add DragonWing-specific PMDs with `-Denable_drivers=...` if needed.
Verify pkg-config can see it: