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v0.2.1 - Maintenance Release: All Architectures Boot Successfully\!

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@doublegate doublegate released this 17 Jun 00:01
· 270 commits to main since this release
v0.2.1
7666a12

🎉 All Architectures Boot to Stage 6!

This maintenance release completes the critical boot fixes for all three target architectures. Every platform now successfully boots through Stage 6 of the microkernel initialization.

🚀 Major Achievements

Architecture Boot Status

  • x86_64: ✅ Boots to Stage 6 with full bootstrap sequence
  • AArch64: ✅ Boots to Stage 6 with assembly-only workarounds
  • RISC-V: ✅ Boots to Stage 6 with complete initialization

AArch64 LLVM Bug Workaround

  • Implemented comprehensive assembly-only UART output
  • Bypassed all iterator and loop constructs that trigger LLVM bugs
  • Created safe iteration utilities in arch/aarch64/safe_iter.rs
  • Direct character-by-character output for reliable boot messages

🔧 Technical Improvements

Code Quality

  • Zero Warnings: All architectures compile without warnings
  • Clippy Clean: All linting checks pass with -D warnings
  • Formatting: Consistent code style across entire codebase

Critical Fixes

  • Fixed AArch64 boot regression from clippy improvements
  • Resolved unreachable code warnings with proper attributes
  • Fixed unused variable warnings with cfg_attr annotations
  • Removed unnecessary unsafe blocks in nested contexts

Boot Sequence Verification

All architectures now output the complete boot sequence:

  1. STB - Stack and BSS initialized
  2. RUST - Rust environment ready
  3. PRE - Pre-kernel setup complete
  4. MAIN - Kernel main reached
  5. OK - Kernel initialization started
  6. S6 - Stage 6 bootstrap complete
  7. BOOTOK - Boot successful

📚 Documentation Updates

  • Created SESSION-AARCH64-STAGE6-FIX.md documenting the fix
  • Reorganized session documentation into archive structure
  • Updated all tracking files with current status
  • Comprehensive commit history preserved

🏗️ Build & Test

# Build all architectures
./build-kernel.sh all dev

# Test boot sequences
qemu-system-x86_64 -drive format=raw,file=target/x86_64-veridian/debug/bootimage-veridian-kernel.bin -serial stdio -display none
qemu-system-aarch64 -M virt -cpu cortex-a57 -kernel target/aarch64-unknown-none/debug/veridian-kernel -serial stdio -display none  
qemu-system-riscv64 -M virt -kernel target/riscv64gc-unknown-none-elf/debug/veridian-kernel -serial stdio -display none

🎯 What's Next

With all architectures booting successfully, Phase 2 (User Space Foundation) development can now proceed without blockers. The microkernel core is stable and ready for user-space components.

📝 Notes

  • AArch64 requires special handling due to LLVM bare metal bugs
  • All workarounds are documented and isolated to architecture-specific code
  • Performance and functionality remain unaffected on x86_64 and RISC-V

Contributors

  • Architecture fixes and testing by @doublegate
  • Session work documented in detail for future reference

Full Changelog: v0.2.0...v0.2.1

Contributors

doublegate
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