0.1

Author: markfirmware

.github/workflows/main.yml

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+name: CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: install software
+      run: |
+        sudo apt-get -qq install llvm
+        ls -lt /usr/bin/llvm-objcopy*
+
+        wget --quiet --output-document=- https://github.com/github/hub/releases/download/v2.12.3/hub-linux-amd64-2.12.3.tgz | tar zx
+        mv hub-linux-* hub
+        ./hub/bin/hub --version
+
+        ZIG=$(wget --quiet --output-document=- https://ziglang.org/download/index.json | jq --raw-output '.master."x86_64-linux".tarball')
+        wget --quiet --output-document=- $ZIG | tar Jx
+        mv zig-linux-x86_64-* zig
+        echo zig version $(./zig/zig version)
+    - name: build
+      run: |
+        REPO=$(basename $GITHUB_REPOSITORY)
+        ./zig/zig build -Darmv6
+        cp -a $REPO-armv6.img boot/
+        ./zig/zig build -Darmv7
+        cp -a $REPO-armv7.img boot/
+    - name: release draft
+      env:
+        GITHUB_USER: $GITHUB_ACTOR
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        REPO=$(basename $GITHUB_REPOSITORY)
+        RELEASE_TAG=$(grep '^const release_tag =' src/main.zig | sed 's/";//' | sed 's/^.*"//')
+        RELEASE_ASSET=$REPO-$RELEASE_TAG.zip
+        pushd boot
+        echo $RELEASE_TAG > RELEASE.md
+        echo >> RELEASE.md
+        cat ../release-message.md >> RELEASE.md
+        zip -r $RELEASE_ASSET .
+        ../hub/bin/hub release create --draft --prerelease --file RELEASE.md --attach $RELEASE_ASSET $RELEASE_TAG
+        popd

.gitignore

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+*.bin
+*.dat
+*.elf
+*.img
+*.zip
+zig-cache/

README.md

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+zig logo is displayed
+
+Successfully tested on rpi3b, rpi3b+
+
+Not yet working on armv6 raspberry pi models

assets/zig-logo.bmp

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+# https://www.raspberrypi.org/documentation/configuration/config-txt/
+
+disable_commandline_tags=1
+kernel_old=1
+dtparam=audio=on
+disable_splash=1
+boot_delay=0
+cec_osd_name=Zig!
+
+[rpi0]
+kernel=zig-bare-metal-raspberry-pi-armv6.img
+[rpi1]
+kernel=zig-bare-metal-raspberry-pi-armv6.img
+[rpi2]
+kernel=zig-bare-metal-raspberry-pi-armv7.img
+[rpi3]
+kernel=zig-bare-metal-raspberry-pi-armv7.img
+[rpi4]
+kernel=zig-bare-metal-raspberry-pi-armv7.img

assets/zig-logo.svg

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+const std = @import("std");
+const Builder = std.build.Builder;
+const builtin = @import("builtin");
+
+pub fn build(b: *Builder) void {
+    const mode = b.standardReleaseOptions();
+    const want_armv6 = b.option(bool, "armv6", "Build armv6 instead of armv7 (armv7 is default)") orelse false;
+    const want_armv7 = b.option(bool, "armv7", "Build armv7 instead of armv6 (armv7 is default)") orelse false;
+
+    const exec_name = "zig-bare-metal-raspberry-pi";
+    const exe = b.addExecutable(exec_name, "src/main.zig");
+    exe.setOutputDir("zig-cache");
+    exe.setBuildMode(mode);
+
+    var arch: builtin.Arch = undefined;
+    var subarch: u32 = undefined;
+    var kernel_name: []const u8 = undefined;
+    if (want_armv6) {
+        arch = builtin.Arch{ .arm = builtin.Arch.Arm32.v6 };
+        subarch = 6;
+        kernel_name = exec_name ++ "-armv6.img";
+    } else {
+        arch = builtin.Arch{ .arm = builtin.Arch.Arm32.v7 };
+        subarch = 7;
+        kernel_name = exec_name ++ "-armv7.img";
+    }
+    const os = builtin.Os.freestanding;
+    const environ = builtin.Abi.eabihf;
+    exe.setTarget(arch, builtin.Os.freestanding, environ);
+    exe.addBuildOption(u32, "subarch", subarch);
+
+    const linker_script = "src/linker.ld";
+    exe.setLinkerScriptPath(linker_script);
+
+    const run_objcopy = b.addSystemCommand([_][]const u8{
+        "llvm-objcopy-6.0", exe.getOutputPath(),
+        "-O", "binary",
+        kernel_name,
+    });
+    run_objcopy.step.dependOn(&exe.step);
+
+    b.default_step.dependOn(&run_objcopy.step);
+}