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diff --git a/docs/raspberry_pi.md b/docs/raspberry_pi.md new file mode 100644 index 00000000..b61315cd --- /dev/null +++ b/docs/raspberry_pi.md @@ -0,0 +1,25 @@ +# Working with ARM/ARM64/the Raspberry PI + +Open Screen Library supports cross compilation for both arm32 and arm64 +platforms, by using the `gn args` parameter `target_cpu="arm"` or +`target_cpu="arm64"` respectively. Note that quotes are required around the +target arch value. + +Setting an arm(64) target_cpu causes GN to pull down a sysroot from openscreen's +public cloud storage bucket. Google employees may update the sysroots stored +by requesting access to the Open Screen pantheon project and uploading a new +tar.xz to the openscreen-sysroots bucket. + +NOTE: The "arm" image is taken from Chromium's debian arm image, however it has +been manually patched to include support for libavcodec and libsdl2. To update +this image, the new image must be manually patched to include the necessary +header and library dependencies. Note that if the versions of libavcodec and +libsdl2 are too out of sync from the copies in the sysroot, compilation will +succeed, but you may experience issues decoding content. + +To install the last known good version of the libavcodec and libsdl packages +on a Raspberry Pi, you can run the following command: + +```bash +sudo ./cast/standalone_receiver/install_demo_deps_raspian.sh +``` |