Add unified core configuration generator with CLI and GUI interfaces

[Copilot]

This PR implements a comprehensive configuration generator tool for the VIGNA RISC-V processor, addressing the need for a unified way to generate processor configurations with desired features.

🚀 Features Added

Configuration Generator Tool (tools/vigna_config_generator.py)

• CLI Interface: Full command-line interface with comprehensive options
• GUI Interface: Cross-platform tkinter-based graphical interface
• Configuration Parsing: Parse and modify existing .vh configuration files
• Validation: Automatic dependency checking and conflict resolution
• Predefined Configurations: Support for all 7 standard RISC-V variants

Supported Configurations

Configuration	Extensions	Description
rv32i	Base	Minimal RISC-V base configuration
rv32e	E	Embedded configuration (16 registers)
rv32im	I + M	Base + Multiply/Divide extension
rv32ic	I + C	Base + Compressed instructions
rv32imc	I + M + C	Base + Multiply/Divide + Compressed
rv32im_zicsr	I + M + Zicsr	Base + Multiply/Divide + CSR
rv32imc_zicsr	I + M + C + Zicsr	Full featured configuration

🛠️ Usage Examples

CLI Interface

# List all predefined configurations
python3 tools/vigna_config_generator.py --list

# Generate RV32IMC configuration
python3 tools/vigna_config_generator.py --config rv32imc --output vigna_conf.vh

# Custom configuration with specific features
python3 tools/vigna_config_generator.py --config rv32i --enable-m-extension --enable-c-extension --output custom.vh

# Parse existing config and modify
python3 tools/vigna_config_generator.py --parse vigna_conf.vh --enable-interrupt --output updated.vh

# Validate configuration
python3 tools/vigna_config_generator.py --enable-m-extension --validate

GUI Interface

# Launch cross-platform GUI
python3 tools/vigna_config_generator.py --gui

🔧 Technical Details

Configuration Features Supported

• RISC-V Extensions: M (multiply/divide), C (compressed), E (embedded), Zicsr (CSR)
• Performance Options: Two-stage shift, preload negative, alignment checks
• Memory Configuration: Reset addresses, stack pointer initialization
• Bus Architecture: Unified vs separate instruction/data buses, AXI4-Lite support
• Interrupt Support: Machine-level interrupts with CSR integration

Validation & Safety

• Dependency checking (e.g., m_fpga_fast requires m_extension)
• Conflict resolution between incompatible options
• Comprehensive error reporting with actionable messages

🧪 Testing

Added comprehensive test suite (tests/test_config_generator.py):

• ✅ All predefined configurations generate successfully
• ✅ All existing configuration files parse correctly
• ✅ CLI interface functionality verified
• ✅ Configuration validation works properly
• ✅ 100% test pass rate

📚 Documentation Updates

Updated README.md with:

• Complete usage examples for both CLI and GUI
• Configuration table showing all supported variants
• Feature descriptions and integration instructions
• Quick start guide for the new tool

🔄 Backward Compatibility

• Maintains full compatibility with existing configuration system
• Uses same .vh file format and define directives
• Works with existing Makefile and build targets
• Manual configuration editing still supported

🌐 Cross-Platform Support

• Pure Python 3 implementation
• Uses standard tkinter (no external dependencies)
• Works on Windows, macOS, and Linux
• Easy deployment and installation

Fixes #26.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

[Copilot]

Pull Request Overview

This PR adds a unified core configuration generator tool with both CLI and GUI interfaces for the VIGNA RISC-V processor, enabling streamlined generation, parsing, and validation of core configurations. Key changes include:

• Implementation of the configuration generator tool (CLI and GUI) in tools/vigna_config_generator.py.
• A comprehensive test suite in tests/test_config_generator.py for generating, parsing, and validating configurations.
• Updated documentation in README.md outlining usage examples, directory structure, and feature support.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

File	Description
tests/test_config_generator.py	New tests covering predefined configurations, parsing, CLI, and validation functionality.
README.md	Updated documentation with usage examples, interface instructions, and project layout revisions.

Comments suppressed due to low confidence (1)

README.md:103

• Ensure that the updated directory structure in the README matches the actual project layout and that each tool (e.g., bin_to_verilog_mem.py) is briefly described for clarity.

├── tools/                   # 🛠️ Utility scripts

[Copilot]

Verify that the expected header check in the generated configuration file is correctly specified. If the intended header is '#ifndef VIGNA_CONF_VH', update the check to match it exactly.

Suggested change

	if '`ifndef VIGNA_CONF_VH' not in content:
	if '#ifndef VIGNA_CONF_VH' not in content: