VolgaOS legacy bootloader

GPT Partition types

• C586E653-7991-4947-AC24-75F8CFF9945C - VolgaBL second stage bootloader (SSL)
• 876D0DC7-CF66-4C63-BCEE-BD79EE10F593 - VolgaBL third stage bootloader (TSL)
• 78A9E598-3638-4D67-B2EB-0123D0AFBDBD - VolgaOS kernel

Building

Dependencies

• CMake 3.20+
• GCC
• NASM
• Doxygen (optional)

Options

• -DOUTPUT=<directory> path to the directory where bootloader images will be placed. Default: ${CMAKE_BINARY_DIR}/out
• -DBUILD_DOCS=<boolean> build docs. Requires Doxygen. Default: OFF
• -DOUTPUT_DOCS=<directory> path to the directory where docs will be placed. Default: ${OUTPUT}/docs

Steps

1. Create build directory

mkdir build

2. Configure CMake

cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DOUTPUT=../out

3. Run make to build everything

cd build
make

You can also build only bootloader, without docs

cd build
make bootloader

Manual installation

Drive mapping

1. Map your drive using GPT (e.g. using fdisk)
2. Create 2 partitions for SSL and TSL loaders, each 64KB
3. Assign GPT partition types for each partition

Writing images

1. Write bootloader_mbr to the first sector of your bootdrive (WARNING: this will erase your current MBR and other OS's won't boot!)
2. Write bootloader_ssl to SSL partition
3. Write bootloader_tsl to TSL partition