wrote a basic bootloader

scripts/build_stage2.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -e
+
+# Set root directory
+cd "$(dirname "$0")/.."
+
+# Create build directory if it doesn't exist
+mkdir -p build/bios
+
+# Compile C code
+gcc -m32 -ffreestanding -fno-pie -fno-stack-protector -nostdlib -nodefaultlibs \
+    -Wall -Wextra -O2 -c boot/bios/stage2/stage2.c -o build/bios/stage2.o
+
+# Assemble boot code
+nasm -f elf32 boot/bios/stage2/boot.s -o build/bios/boot.o
+
+# Link to binary
+ld -m elf_i386 -T boot/bios/stage2/stage2.ld \
+    build/bios/boot.o \
+    build/bios/stage2.o \
+    -o build/bios/stage2.bin
+
+# Verify size (stage2 can be multiple sectors, but let's warn if it's too large)
+size=$(wc -c < build/bios/stage2.bin)
+if [ "$size" -gt 32768 ]; then    # 64 sectors (32KB) should be plenty
+    echo "Warning: stage2.bin is larger than 32KB ($size bytes)"
+fi
+
+echo "Successfully built stage2.bin ($size bytes)"