A modern Music Player Daemon based on Rockbox firmware

[2026.06.14]

Added

• arm-unknown-linux-gnueabihf cross-compilation target — new scripts/build-armhf.sh builds a native ARMv6 hard-float rockboxd binary (e.g. Raspberry Pi Zero) using the Dockerfile.arm-unknown-linux-gnueabihf cross-toolchain; Zig links with -Dtarget=arm-linux-gnueabihf -Dcpu=arm1176jzf_s; Cross.toml wires cross build to the same Docker image; firmware configure target 208 (ARMHFHOST) reuses the headless target files with arm-linux-gnueabihf-gcc and -march=armv6 -marm -mfpu=vfp -mfloat-abi=hard
• crates/alsa-sink — direct libasound PCM sink for ARM Linux; uses snd_pcm_writei (RWInterleaved, same as aplay), avoiding cpal's ALSA backend and the snd_pcm_status_get_htstamp null-PLT-entry crash on older ARM devices; ALSA is opened once in pcm_alsa_postinit() and the writer thread lives for the daemon lifetime so resume after a pcmbuf-dry stall is instant (no re-open latency); enabled via --features fts5,alsa-sink in the ARM build; registered as PCM_SINK_ALSA = 9 in firmware/export/pcm_sink.h
• firmware/target/hosted/headless/pcm-alsa.c — C PCM sink ops mirroring pcm-cpal.c but calling pcm_alsa_* entry points
• .github/workflows/linux-armhf-build.yml — CI workflow that builds and uploads the armhf binary to GitHub Releases

Fixed

• ARM Linux: SIGILL from __ARMv7ABSLongThunk__ — Ubuntu's arm-linux-gnueabihf-gcc defaults to -march=armv7-a; added -march=armv6 -marm to the configure armhfhostcc() function so all C objects are tagged ARMv6; Zig's LLD then uses ARMv6-compatible thunks that work on ARM1176JZF-S
• ARM Linux: SIGILL at startup — LLD derives HasMovt from the target triple (arm-linux-gnueabihf = conventional ARMv7), generating movw/movt thunks even when object attributes say ARMv6; fixed by using ReleaseFast to produce a compact binary (< 32 MB) that fits within LLD's direct-branch range, eliminating the need for long-range veneers
• ARM Linux: SIGSEGV in SimpleBroker::subscribe (dyn Any vtable null) — Zig's LLD generates zero vtable entries for dyn Any + Send COMDAT groups on ARM 32-bit in ReleaseFast mode; replaced HashMap<TypeId, Box<dyn Any + Send>> in crates/graphql/src/simplebroker.rs with a type-erased ErasedSenders struct storing the drop function as a heap pointer written at runtime (not a link-time vtable), so every function pointer is a valid non-zero Thumb address
• ARM Linux: SIGSEGV in alsa::pcm::Status::get_htstamp — on ARM devices where libasound ships snd_pcm_status_get_htstamp as a static inline (not an exported symbol) the PLT entry resolves to 0x00000000 at runtime, crashing in cpal's ALSA timing probe; fixed by replacing cpal with the direct alsa-sink that never calls this function
• ARM Linux: 32-bit ABI mismatches in crates/sys — c_long/c_ulong are 32-bit on ARM (not 64-bit); added as c_long / as c_ulong casts in metadata.rs, playback.rs, playlist.rs, sound/dsp.rs, system.rs, tagcache.rs, and as u64/as i64 field casts in types/mp3_entry.rs; crates/cli/src/lib.rs now uses libc::rlim_t instead of u64 for rlimit fields
• ARM Linux: audiohw_set_volume undefined reference to pcm_cpal_set_volume — gated the cpal volume call on !ARMHFHOST in audiohw-noop.c; volume is handled by Rockbox's DSP layer (HAVE_SW_TONE_CONTROLS) on ARM
• ARM Linux: PCM_SINK_ALSA = 9 array-bounds error in pcm.c — enum entry was declared before PCM_SINK_CMAF = 8, making PCM_SINK_NUM = 9 and sinks[9] out-of-bounds; moved ALSA entry after CMAF so PCM_SINK_NUM = 10
• firmware/export/config.h: added #elif defined(ARMHFHOST) → #include "config/armhfhost.h" so the ARM hosted build is recognised as a valid platform; added ARMHFHOST guard to audiohw.h (sdl_codec.h inclusion) and filesystem-app.c (rbhome pointer declaration)
• metadata: probe_content_type_format now logs the exact Content-Type string received (or reports that stream_content_type returned < 0) to stderr, making HTTP format-detection failures visible; added audio/x-aac and audio/vnd.dlna.adts to the AAC-BSF MIME mapping

Full Changelog: https://github.com/tsirysndr/rockbox-zig/compare/2026.06.07...2026.06.14