Red Bear OS — microkernel OS in Rust, based on Redox

Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh

local/config/my-amd-desktop.toml

@@ -0,0 +1,66 @@
+# AMD Desktop Configuration — Phase 2: AMD GPU Display
+# Builds on top of desktop config with AMD GPU support
+#
+# Phases completed:
+#   P1: redox-driver-sys, linux-kpi, firmware-loader ✅
+#   P2: redox-drm, amdgpu (modesetting only) ← YOU ARE HERE
+
+include = ["desktop.toml"]
+
+[general]
+filesystem_size = 8196
+
+[packages]
+# AMD GPU driver stack — Phase 1 infrastructure
+redox-driver-sys = {}
+linux-kpi = {}
+firmware-loader = {}
+
+# AMD GPU — Phase 2: Display output
+redox-drm = {}
+amdgpu = {}
+
+# Input (Phase 3)
+evdevd = { path = "../../local/recipes/system/evdevd" }
+udev-shim = { path = "../../local/recipes/system/udev-shim" }
+
+# Wayland (Phase 4 — depends on P2+P3)
+# libwayland = {}
+# wayland-protocols = {}
+# smallvil = {}
+# mesa = {}
+# libdrm = {}
+
+# KDE (Phase 6)
+# qtbase = {}
+# qtwayland = {}
+# kwin = {}
+# plasma-workspace = {}
+
+# Files to include
+[[files]]
+path = "/usr/firmware/amdgpu"
+data = ""
+directory = true
+mode = 0o755
+
+[[files]]
+path = "/usr/lib/init.d/05_firmware"
+data = """
+requires_weak 00_drivers
+nowait firmware-loader
+"""
+
+[[files]]
+path = "/usr/lib/init.d/10_evdevd"
+data = """
+requires_weak 00_drivers
+nowait evdevd
+"""
+
+[[files]]
+path = "/usr/lib/init.d/11_udev"
+data = """
+requires_weak 00_drivers
+nowait udev-shim
+"""

local/config/my-baremetal-desktop.toml

@@ -0,0 +1,72 @@
+# Unified Bare-Metal Desktop Configuration
+# Auto-detects GPU vendor (AMD or Intel) at runtime
+#
+# Phases completed:
+#   P1: redox-driver-sys, linux-kpi, firmware-loader
+#   P2: redox-drm (AMD + Intel drivers)
+#   P3: evdevd, udev-shim
+
+include = ["desktop.toml"]
+
+[general]
+filesystem_size = 10240
+
+[packages]
+# GPU driver infrastructure — Phase 1
+redox-driver-sys = {}
+linux-kpi = {}
+firmware-loader = {}
+
+# GPU — Phase 2: Both AMD and Intel display drivers
+redox-drm = {}
+
+# Input — Phase 3
+evdevd = { path = "../../local/recipes/system/evdevd" }
+udev-shim = { path = "../../local/recipes/system/udev-shim" }
+
+# Wayland (Phase 4 — depends on P2+P3)
+# libwayland = {}
+# wayland-protocols = {}
+# smallvil = {}
+# mesa = {}
+# libdrm = {}
+
+# KDE (Phase 6)
+# qtbase = {}
+# qtwayland = {}
+# kwin = {}
+# plasma-workspace = {}
+
+# Firmware directories for both GPU vendors
+[[files]]
+path = "/usr/firmware/amdgpu"
+data = ""
+directory = true
+mode = 0o755
+
+[[files]]
+path = "/usr/firmware/i915"
+data = ""
+directory = true
+mode = 0o755
+
+[[files]]
+path = "/usr/lib/init.d/05_firmware"
+data = """
+requires_weak 00_drivers
+nowait firmware-loader
+"""
+
+[[files]]
+path = "/usr/lib/init.d/10_evdevd"
+data = """
+requires_weak 00_drivers
+nowait evdevd
+"""
+
+[[files]]
+path = "/usr/lib/init.d/11_udev"
+data = """
+requires_weak 00_drivers
+nowait udev-shim
+"""

local/config/my-intel-desktop.toml

@@ -0,0 +1,58 @@
+# Intel Desktop Configuration
+# Builds on top of desktop config with Intel GPU support
+#
+# Phases completed:
+#   P1: redox-driver-sys, linux-kpi, firmware-loader
+#   P2: redox-drm, Intel i915 (modesetting only)
+
+include = ["desktop.toml"]
+
+[general]
+filesystem_size = 8196
+
+[packages]
+# Intel GPU driver stack — Phase 1 infrastructure
+redox-driver-sys = {}
+linux-kpi = {}
+firmware-loader = {}
+
+# Intel GPU — Phase 2: Display output
+redox-drm = {}
+
+# Input (Phase 3)
+evdevd = { path = "../../local/recipes/system/evdevd" }
+udev-shim = { path = "../../local/recipes/system/udev-shim" }
+
+# Wayland (Phase 4 — depends on P2+P3)
+# libwayland = {}
+# wayland-protocols = {}
+# smallvil = {}
+# mesa = {}
+# libdrm = {}
+
+[[files]]
+path = "/usr/firmware/i915"
+data = ""
+directory = true
+mode = 0o755
+
+[[files]]
+path = "/usr/lib/init.d/05_firmware"
+data = """
+requires_weak 00_drivers
+nowait firmware-loader
+"""
+
+[[files]]
+path = "/usr/lib/init.d/10_evdevd"
+data = """
+requires_weak 00_drivers
+nowait evdevd
+"""
+
+[[files]]
+path = "/usr/lib/init.d/11_udev"
+data = """
+requires_weak 00_drivers
+nowait udev-shim
+"""

local/config/pcid.d/amd_gpu.toml

@@ -0,0 +1,17 @@
+# PCID configuration for AMD GPU auto-detection
+# When pcid detects an AMD GPU (vendor 0x1002, class 0x03),
+# it launches redox-drm with the PCI device location.
+
+[[device]]
+vendor = 0x1002
+class = 0x03
+subclass = 0x00
+command = ["redox-drm"]
+args = ["$BUS", "$DEV", "$FUNC"]
+
+[[device]]
+vendor = 0x1002
+class = 0x03
+subclass = 0x02
+command = ["redox-drm"]
+args = ["$BUS", "$DEV", "$FUNC"]