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Reorganize BBeOS project structure for better maintainability 
- Reorganized directory structure following open source best practices
- Created src/ directory for all source code components
- Moved build artifacts to build/ subdirectories
- Organized documentation into phases/, guides/, and api/ subdirectories
- Moved third-party code to vendor/ directory
- Moved downloads to downloads/ directory
- Updated all build scripts to reference new directory structure
- Created comprehensive PROJECT_STRUCTURE.md documentation
- Added DEVELOPMENT_GUIDE.md as main entry point
- Improved separation of concerns and maintainability
- Follows standard open source project conventions
2025-08-01 11:48:06 +02:00

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Phase 1 Implementation Summary - Hardware Access & Bootloader Research

✅ Completed Tasks

1. Development Environment Setup

  • Cross-compilation toolchain (arm-linux-gnueabihf-)
  • Linux kernel source (v6.1) downloaded and configured
  • Build scripts created and tested
  • Gitea CI/CD pipeline configured

2. Hardware Research & Documentation

  • Comprehensive Q20 hardware specifications documented
  • Bootloader analysis completed (PBL, SBL, ABOOT, secure boot)
  • Driver compatibility research documented
  • Hardware access methods identified (Fastboot, EDL, JTAG)

3. Kernel Configuration & Build

  • MSM8960 kernel configuration created
  • Essential drivers enabled (serial, MMC, DRM, sound, input, GPIO, I2C, SPI, USB, Wi-Fi, BT)
  • Kernel successfully compiled for ARMv7
  • Device tree compilation fixed and working

4. Device Tree Development

  • Q20-specific device tree created (qcom-msm8960-blackberry-q20.dts)
  • Simplified device tree created (qcom-msm8960-blackberry-q20-simple.dts)
  • All syntax errors resolved
  • Device tree blobs successfully generated

📁 Generated Files

Kernel Images

  • kernel-source/arch/arm/boot/zImage (10.1 MB) - Compressed kernel image
  • kernel-source/arch/arm/boot/Image (26.1 MB) - Uncompressed kernel image

Device Tree Blobs

  • kernel-source/arch/arm/boot/dts/qcom/qcom-msm8960-blackberry-q20.dtb (10.7 KB) - Full Q20 device tree
  • kernel-source/arch/arm/boot/dts/qcom/qcom-msm8960-blackberry-q20-simple.dtb (7.5 KB) - Simplified Q20 device tree

Build Scripts

  • scripts/build-kernel-minimal.sh - Automated kernel build script
  • scripts/configure-kernel.sh - Kernel configuration script

🔧 Technical Details

Kernel Configuration

  • Architecture: ARMv7 (32-bit)
  • Target: Qualcomm MSM8960 (Snapdragon S4 Plus)
  • Cross-compiler: arm-linux-gnueabihf-gcc
  • Base config: qcom_defconfig
  • Modules: Disabled (built-in only)
  • Initramfs: Enabled with empty source

Device Tree Features

  • Serial console: GSBI5 UART enabled
  • Storage: SDCC1 (eMMC) and SDCC3 (SD card) enabled
  • Display: MDP5 and DSI controllers configured
  • Input: GPIO keys for volume and camera
  • I2C: GSBI1 and GSBI2 buses for keyboard/trackpad/battery
  • GPIO: MSM GPIO controller with Q20-specific pins

Hardware Support Status

  • ✅ CPU: MSM8960 Krait dual-core
  • ✅ Memory: 2GB RAM configuration
  • ✅ Storage: eMMC and SD card support
  • ✅ Serial: UART console for debugging
  • ✅ GPIO: Basic GPIO support
  • ⚠️ Display: Basic MDP/DSI support (needs panel driver)
  • ⚠️ Input: Basic GPIO keys (needs I2C keyboard/trackpad drivers)
  • ⚠️ Audio: Basic sound framework (needs codec driver)
  • ⚠️ Wi-Fi/BT: Framework ready (needs firmware blobs)
  • ⚠️ Modem: Not yet addressed

🚀 Next Steps (Phase 2)

Immediate Tasks

  1. Create minimal root filesystem

    • BusyBox-based initramfs
    • Basic shell and utilities
    • Dropbear SSH for remote access

  2. Test kernel boot

    • QEMU emulation testing
    • Hardware testing on actual Q20 device
    • Serial console verification

  3. Boot image creation

    • Android boot image format
    • Device tree blob integration
    • Initramfs integration

Hardware Testing Strategy

  1. Safe testing approach

    • Use QEMU for initial testing
    • Test on actual hardware only after validation
    • Have recovery method ready (EDL mode)

  2. Boot method options

    • Fastboot (if bootloader unlocked)
    • EDL mode (emergency download)
    • Recovery mode modification
    • kexec (if kernel already running)

📊 Success Metrics

Phase 1 Goals ✅

  • Kernel compiles successfully for MSM8960
  • Device tree describes Q20 hardware
  • Basic hardware support framework in place
  • Development environment fully functional
  • CI/CD pipeline operational

Phase 2 Goals 🎯

  • Kernel boots to shell on Q20 hardware
  • Serial console accessible
  • Basic hardware peripherals working
  • Root filesystem functional
  • Boot process documented

🔍 Technical Challenges Resolved

  1. Device Tree Syntax: Fixed all DTS compilation errors
  2. Clock References: Corrected GCC clock definitions
  3. Node References: Fixed backlight and other node references
  4. Build System: Configured proper cross-compilation
  5. Kernel Config: Enabled essential drivers while keeping it minimal

📚 Documentation Created

  • hardware/q20-specs.md - Complete hardware specifications
  • research/bootloader-analysis.md - Bootloader research and analysis
  • research/driver-compatibility.md - Driver compatibility matrix
  • research/q20-hardware-research.md - Detailed hardware research
  • docs/PHASE_1_IMPLEMENTATION.md - Implementation plan
  • docs/PHASE_1_SUMMARY.md - This summary document

🎉 Phase 1 Complete!

We have successfully completed Phase 1 of the BBeOS project. The foundation is now in place with a working kernel, device trees, and development environment. The project is ready to move into Phase 2: Bootstrapping a Minimal Linux.