Bootloader for ZJUNIX

Introduction

This is a bootloader for ZJUNIX, with respect to mips32 specification, and is able to run on QEMU.

Build and Run

Build tools:

1. make
2. Cross compiler for mips (either one is ok)
   • mips-mti-elf/mips-img-elf: Provided by MIPS, available on both Windows and Linux.
   • mips-linux-gnu: If you use this compiler, the compilation flags in Makefile should be changed, as they are written for mips-mti-elf/mips-img-elf.

To run:

1. Install QEMU
2. Build (make all)
3. Run (make run)

To debug:

1. Run QEMU in debug mode (make run-gdb)
2. Connect cross compiler's gdb to QEMU (mips-mti-elf-gdb -x scripts/debug.gdb)
3. Within gdb, set break points and execute continue to start debugging bootloader

Reference

1. VGA
   • VGA Specification:
     • VGA Hardware: A short introduction of VGA
     • FreeVGA: Detailed description of VGA, including hardware specification and programming instructions
   • Code snippets:
     • x86 version: written in C and x86 assembly
     • C version without BIOS: written in C without BIOS invocation, but it doesn't setup palettes, which is an indespensible part of bare metal vga driver
2. Compiler
   • mips-mti-elf/mips-img-elf: MIPS

License