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Arch-R/build-mesa.sh
Douglas Teles 18c229177a First successful build — 11 pipeline gaps fixed, repo organized 
Build pipeline now produces a working bootable image. Found and fixed
11 gaps between the manually-built working SD and build-all.sh output:

Boot partition:
- extlinux.conf as primary boot method (U-Boot loads first)
- PanCho removed from boot.ini and build-image.sh
- Stale uInitrd removed (caused wrong boot path)
- logo.bmp (U-Boot native BMP) replaces broken splash-1.raw
- fstab uses LABEL=ROMS instead of /dev/mmcblk1p3
- Only R36S DTB copied (no extra r35s/rg351mp-linux)

Root filesystem:
- emulationstation.service created and enabled
- getty@tty1 disabled (ES takes over tty1)
- archr-boot-setup: Before=emulationstation.service, simplified
- All services use After=local-fs.target (not removed getty)
- boot-timing captures ES profiling data

New files added to repo:
- build-mesa.sh, build-retroarch.sh (were untracked)
- Custom DTS, ALSA config, controller autoconfig
- Runtime scripts (retroarch-launch, pmic-poweroff, hotkeys)
- VLC stub source, timezone data

Repo cleanup:
- README.md rewritten with build instructions + architecture
- .gitignore expanded (test scripts, failed approaches, logs)
- splash-show.sh removed (failed splash approach)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-22 14:01:13 -03:00

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#!/bin/bash
#==============================================================================
# Arch R - Build Mesa 26 (Panfrost GPU driver for Mali-G31)
#==============================================================================
# Builds Mesa 26.0.x inside the rootfs chroot environment (native aarch64).
# Replaces ALARM's Mesa 25.x with Mesa 26 optimized for RK3326/Mali-G31.
#
# GPU Pipeline:
# ES (GLES 1.0) → Mesa TNL → Panfrost → Mali-G31 GPU
# RetroArch (GLES 2.0/3.1) → Panfrost → Mali-G31 GPU
#
# Mesa provides: EGL, GLES 1.0/2.0/3.1, GBM, kmsro (rockchip-drm ↔ panfrost bridge)
# Built with -Dgles1=enabled -Dglvnd=false (direct Mesa EGL, no libglvnd dispatch)
#
# This runs AFTER build-rootfs.sh and BEFORE build-emulationstation.sh
# Usage: sudo ./build-mesa.sh
#==============================================================================
set -e
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
OUTPUT_DIR="$SCRIPT_DIR/output"
ROOTFS_DIR="$OUTPUT_DIR/rootfs"
CACHE_DIR="$SCRIPT_DIR/.cache"
# CRITICAL: Always clean up bind mounts on exit (success OR failure).
cleanup_mounts() {
echo "[MESA] Cleaning up bind mounts..."
umount -l "$ROOTFS_DIR/run" 2>/dev/null || true
umount -l "$ROOTFS_DIR/sys" 2>/dev/null || true
umount -l "$ROOTFS_DIR/proc" 2>/dev/null || true
umount -l "$ROOTFS_DIR/dev/pts" 2>/dev/null || true
umount -l "$ROOTFS_DIR/dev" 2>/dev/null || true
}
trap cleanup_mounts EXIT
# Mesa version
MESA_VERSION="26.0.0"
MESA_URL="https://archive.mesa3d.org/mesa-${MESA_VERSION}.tar.xz"
MESA_TARBALL="$CACHE_DIR/mesa-${MESA_VERSION}.tar.xz"
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'
log() { echo -e "${GREEN}[MESA]${NC} $1"; }
warn() { echo -e "${YELLOW}[MESA] WARNING:${NC} $1"; }
error() { echo -e "${RED}[MESA] ERROR:${NC} $1"; exit 1; }
#------------------------------------------------------------------------------
# Checks
#------------------------------------------------------------------------------
if [ "$EUID" -ne 0 ]; then
error "This script must be run as root (for chroot)"
fi
if [ ! -d "$ROOTFS_DIR/usr" ]; then
error "Rootfs not found at $ROOTFS_DIR. Run build-rootfs.sh first!"
fi
log "=== Building Mesa ${MESA_VERSION} (Panfrost for Mali-G31) ==="
#------------------------------------------------------------------------------
# Step 1: Download Mesa source
#------------------------------------------------------------------------------
log ""
log "Step 1: Getting Mesa source..."
mkdir -p "$CACHE_DIR"
if [ ! -f "$MESA_TARBALL" ]; then
log " Downloading Mesa ${MESA_VERSION}..."
wget -O "$MESA_TARBALL" "$MESA_URL" || {
# Try .0.1 if .0.0 not available yet
MESA_VERSION="26.0.1"
MESA_URL="https://archive.mesa3d.org/mesa-${MESA_VERSION}.tar.xz"
MESA_TARBALL="$CACHE_DIR/mesa-${MESA_VERSION}.tar.xz"
warn "26.0.0 not found, trying ${MESA_VERSION}..."
wget -O "$MESA_TARBALL" "$MESA_URL"
}
else
log " Using cached tarball: $(basename "$MESA_TARBALL")"
fi
#------------------------------------------------------------------------------
# Step 2: Extract and copy into rootfs
#------------------------------------------------------------------------------
log ""
log "Step 2: Setting up build environment in rootfs..."
BUILD_DIR="$ROOTFS_DIR/tmp/mesa-build"
rm -rf "$BUILD_DIR"
mkdir -p "$BUILD_DIR"
log " Extracting Mesa source..."
tar xf "$MESA_TARBALL" -C "$BUILD_DIR" --strip-components=1
log " Source ready ($(du -sh "$BUILD_DIR" | cut -f1))"
#------------------------------------------------------------------------------
# Step 3: Setup chroot
#------------------------------------------------------------------------------
log ""
log "Step 3: Setting up chroot..."
# Copy QEMU
if [ -f "/usr/bin/qemu-aarch64-static" ]; then
cp /usr/bin/qemu-aarch64-static "$ROOTFS_DIR/usr/bin/"
else
error "qemu-aarch64-static not found. Install: sudo apt install qemu-user-static"
fi
# Bind mounts
mount --bind /dev "$ROOTFS_DIR/dev" 2>/dev/null || true
mount --bind /dev/pts "$ROOTFS_DIR/dev/pts" 2>/dev/null || true
mount --bind /proc "$ROOTFS_DIR/proc" 2>/dev/null || true
mount --bind /sys "$ROOTFS_DIR/sys" 2>/dev/null || true
mount --bind /run "$ROOTFS_DIR/run" 2>/dev/null || true
cp /etc/resolv.conf "$ROOTFS_DIR/etc/resolv.conf"
log " Chroot ready"
#------------------------------------------------------------------------------
# Step 4: Build inside chroot
#------------------------------------------------------------------------------
log ""
log "Step 4: Building Mesa inside chroot..."
cat > "$ROOTFS_DIR/tmp/build-mesa-chroot.sh" << 'BUILD_EOF'
#!/bin/bash
set -e
# Disable pacman Landlock sandbox (fails in QEMU chroot)
pacman() { command pacman --disable-sandbox "$@"; }
echo "=== Mesa Build: Installing dependencies ==="
# IMPORTANT: Do NOT use --needed here!
# build-rootfs.sh bloat cleanup deletes gcc/ld/clang/llvm binaries and /usr/lib/gcc
# to save ~420MB in the final image. But pacman's DB still says they're "installed",
# so --needed would skip reinstalling them. Without --needed, pacman force-reinstalls
# all packages, ensuring the actual binaries exist.
# Meson build system + ninja
pacman -S --noconfirm \
meson \
ninja \
cmake \
python \
python-mako \
python-pyyaml \
python-packaging
# Compilation toolchain + system headers
# glibc + linux-api-headers: rootfs bloat cleanup deletes /usr/include entirely.
# gcc/binutils restore their own headers but stdio.h etc. come from glibc.
pacman -S --noconfirm \
gcc \
binutils \
glibc \
linux-api-headers \
pkgconf \
flex \
bison
# Mesa runtime + build dependencies
pacman -S --noconfirm \
libdrm \
expat \
zlib \
zstd \
libelf \
libglvnd \
libunwind \
wayland-protocols \
llvm \
llvm-libs \
clang \
libclc \
spirv-llvm-translator \
spirv-tools
echo "=== Mesa Build: Configuring ==="
cd /tmp/mesa-build
# Meson configure for RK3326 (Mali-G31 Bifrost via Panfrost)
#
# Key choices:
# - gallium-drivers=panfrost: Mali-G31 (Bifrost architecture)
# panfrost also enables kmsro (rockchip-drm ↔ panfrost bridge)
# - vulkan-drivers= (empty): no Vulkan — saves build time, ES/RetroArch use GL/GLES
# - platforms= (empty): no X11/Wayland — we run on KMSDRM (EGL+GBM on DRM/KMS)
# - egl=enabled: SDL3 KMSDRM needs EGL for context creation
# - gles1=enabled: GLES 1.0 state tracker (TNL) for ES-fcamod native rendering
# - gles2=enabled: GLES 2.0/3.1 for RetroArch (Panfrost provides GLES 3.1)
# - gbm=enabled: SDL3 KMSDRM needs GBM for buffer management
# - opengl=true: OpenGL support
# - glvnd=false: install libEGL/libGLES directly (avoids libglvnd version conflicts)
# - glx=disabled: no X11 → no GLX
# - llvm=enabled: Panfrost in Mesa 26 requires LLVM (CLC for compute shaders)
# - video-codecs=all_free: enable free video decode
meson setup build \
--prefix=/usr \
--libdir=lib \
--buildtype=release \
-Db_lto=true \
-Db_ndebug=true \
-Dc_args="-O2 -march=armv8-a+crc -mtune=cortex-a35" \
-Dcpp_args="-O2 -march=armv8-a+crc -mtune=cortex-a35" \
-Dgallium-drivers=panfrost \
-Dvulkan-drivers= \
-Dplatforms= \
-Degl=enabled \
-Dgles1=enabled \
-Dgles2=enabled \
-Dopengl=true \
-Dglx=disabled \
-Dgbm=enabled \
-Dglvnd=false \
-Dllvm=enabled \
-Dgallium-rusticl=false \
-Dvalgrind=disabled \
-Dlmsensors=disabled \
-Dvideo-codecs=all_free
echo "=== Mesa Build: Compiling ==="
# Limit jobs — QEMU chroot eats ~500MB/gcc, avoid OOM
ninja -C build -j2
echo "=== Mesa Build: Installing ==="
# Remove ALARM mesa packages first (avoid file conflicts)
# --noconfirm because removing mesa may pull other packages
for pkg in mesa mesa-vdpau; do
pacman -Rdd --noconfirm "$pkg" 2>/dev/null || true
done
# CRITICAL: Remove old libglvnd EGL/GLES files BEFORE installing Mesa 26.
# Mesa with glvnd=false installs libEGL.so.1.0.0 directly.
# But libglvnd's libEGL.so.1.1.0 has HIGHER .so version (1.1.0 > 1.0.0).
# ldconfig creates libEGL.so.1 symlink pointing to the HIGHEST version
# → old libglvnd EGL gets loaded instead of Mesa's → EGL_BAD_ALLOC.
# Same applies to libGLESv1_CM and libGLESv2.
echo " Removing old libglvnd EGL/GLES files (version conflict prevention)..."
rm -f /usr/lib/libEGL.so* /usr/lib/libEGL_mesa.so*
rm -f /usr/lib/libGLESv1_CM.so*
rm -f /usr/lib/libGLESv2.so*
rm -f /usr/lib/libOpenGL.so*
echo " Old EGL/GLES files removed"
# Install Mesa 26 into system (glvnd=false → direct libEGL.so, libGLESv1_CM.so, etc.)
ninja -C build install
# Rebuild ldconfig cache
ldconfig
# Verify symlinks point to Mesa's files (not stale libglvnd)
echo " EGL symlink: $(ls -la /usr/lib/libEGL.so.1 2>/dev/null | awk '{print $NF}')"
echo " GLES1 symlink: $(ls -la /usr/lib/libGLESv1_CM.so.1 2>/dev/null | awk '{print $NF}')"
echo "=== Mesa Build: Verifying ==="
# Mesa 26 architecture: single libgallium-*.so megadriver (no per-driver .so in /usr/lib/dri/)
# GBM backend: /usr/lib/gbm/dri_gbm.so
# Check gallium megadriver (contains panfrost + kmsro)
GALLIUM_SO=$(ls /usr/lib/libgallium-*.so 2>/dev/null | head -1)
if [ -n "$GALLIUM_SO" ]; then
echo " Gallium driver: OK ($(basename "$GALLIUM_SO"), $(du -h "$GALLIUM_SO" | cut -f1))"
else
echo " ERROR: libgallium-*.so not found!"
exit 1
fi
# Check GBM DRI backend
if [ -f /usr/lib/gbm/dri_gbm.so ]; then
echo " GBM DRI backend: OK"
else
echo " WARNING: dri_gbm.so not found"
fi
# Check EGL (glvnd=false → direct libEGL.so, NOT libEGL_mesa.so vendor dispatch)
if [ -f /usr/lib/libEGL.so.1 ]; then
EGL_SIZE=$(du -h /usr/lib/libEGL.so.1 | cut -f1)
echo " EGL: OK (libEGL.so.1, ${EGL_SIZE} — should be ~360KB for Mesa direct)"
else
echo " WARNING: libEGL.so.1 not found"
fi
# Check GBM
if [ -f /usr/lib/libgbm.so.1 ]; then
echo " GBM: OK (libgbm.so.1)"
else
echo " WARNING: GBM library not found"
fi
# Check GLES 1.0 (needed for ES-fcamod with -DGLES=ON)
if [ -f /usr/lib/libGLESv1_CM.so ] || [ -f /usr/lib/libGLESv1_CM.so.1 ]; then
echo " GLES 1.0: OK ($(ls /usr/lib/libGLESv1_CM.so* 2>/dev/null | head -1))"
else
echo " WARNING: libGLESv1_CM.so not found — GLES 1.0 ES build will fail!"
echo " Verify Mesa was built with -Dgles1=enabled"
fi
if [ -f /usr/include/GLES/gl.h ]; then
echo " GLES headers: OK (/usr/include/GLES/gl.h)"
else
echo " WARNING: GLES/gl.h header not found"
fi
echo " Mesa 26 verified — Panfrost in gallium megadriver"
echo "=== Mesa Build: Complete ==="
BUILD_EOF
chmod +x "$ROOTFS_DIR/tmp/build-mesa-chroot.sh"
chroot "$ROOTFS_DIR" /tmp/build-mesa-chroot.sh
log " Mesa ${MESA_VERSION} built and installed"
#------------------------------------------------------------------------------
# Step 5: Cleanup
#------------------------------------------------------------------------------
log ""
log "Step 5: Cleaning up..."
# Remove build directory (saves ~1-2GB in rootfs)
rm -rf "$BUILD_DIR"
rm -f "$ROOTFS_DIR/tmp/build-mesa-chroot.sh"
# Remove build-only deps to save space
cat > "$ROOTFS_DIR/tmp/cleanup-mesa.sh" << 'CLEAN_EOF'
#!/bin/bash
pacman() { command pacman --disable-sandbox "$@"; }
# Remove build-only packages (not needed at runtime)
for pkg in meson ninja flex bison python-mako python-pyyaml; do
pacman -Rdd --noconfirm "$pkg" 2>/dev/null || true
done
pacman -Scc --noconfirm
CLEAN_EOF
chmod +x "$ROOTFS_DIR/tmp/cleanup-mesa.sh"
chroot "$ROOTFS_DIR" /tmp/cleanup-mesa.sh
rm -f "$ROOTFS_DIR/tmp/cleanup-mesa.sh"
# Remove QEMU
rm -f "$ROOTFS_DIR/usr/bin/qemu-aarch64-static"
# Bind mounts are cleaned up by the EXIT trap (cleanup_mounts)
log " Cleanup complete"
#------------------------------------------------------------------------------
# Summary
#------------------------------------------------------------------------------
log ""
log "=== Mesa ${MESA_VERSION} Build Complete ==="
log ""
log "Pipeline: ES (GLES 1.0) -> Mesa TNL -> Panfrost (Mali-G31)"
log ""
log "Installed (glvnd=false, direct):"
log " /usr/lib/libgallium-26.0.0.so (Panfrost + kmsro megadriver, with GLES 1.0 TNL)"
log " /usr/lib/libEGL.so.1.0.0 (Mesa direct EGL — no libglvnd dispatch)"
log " /usr/lib/libGLESv1_CM.so.1.1.0 (Mesa direct GLES 1.0)"
log " /usr/lib/libGLESv2.so.2.0.0 (Mesa direct GLES 2.0)"
log " /usr/lib/libgbm.so.1 (GBM — buffer management for KMSDRM)"
log " /usr/lib/gbm/dri_gbm.so (GBM DRI backend)"
log ""
log "Next: run build-emulationstation.sh (ES links against Mesa 26 EGL/GLES)"
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