#!/bin/bash

# BBeOS Minimal Kernel Build Script
# Builds a basic kernel for BlackBerry Classic Q20

set -e

echo "Building minimal kernel for BBeOS..."

# Set up environment
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-

# Go to kernel source directory
cd kernel-source

# Clean previous build
echo "Cleaning previous build..."
make clean

# Configure kernel
echo "Configuring kernel..."
make qcom_defconfig

# Enable essential features
echo "Enabling essential features..."
./scripts/config --enable CONFIG_SERIAL_MSM_CONSOLE
./scripts/config --enable CONFIG_MMC_MSM
./scripts/config --enable CONFIG_DRM_MSM
./scripts/config --enable CONFIG_SOUND_MSM
./scripts/config --enable CONFIG_INPUT
./scripts/config --enable CONFIG_GPIO_MSM_V3
./scripts/config --enable CONFIG_I2C_MSM
./scripts/config --enable CONFIG_SPI_MSM
./scripts/config --enable CONFIG_USB_MSM_OTG
./scripts/config --enable CONFIG_WLAN_VENDOR_ATH
./scripts/config --enable CONFIG_BT
./scripts/config --enable CONFIG_EXT4_FS
./scripts/config --enable CONFIG_FAT_FS
./scripts/config --enable CONFIG_VFAT_FS
./scripts/config --enable CONFIG_DEBUG_FS
./scripts/config --enable CONFIG_DEBUG_KERNEL
./scripts/config --enable CONFIG_KGDB
./scripts/config --enable CONFIG_KGDB_SERIAL_CONSOLE

# Disable unnecessary features
echo "Disabling unnecessary features..."
./scripts/config --disable CONFIG_MODULES
./scripts/config --disable CONFIG_MODULE_UNLOAD
./scripts/config --disable CONFIG_MODVERSIONS
./scripts/config --disable CONFIG_MODULE_SRCVERSION_ALL

# Set essential options
echo "Setting essential options..."
./scripts/config --set-str CONFIG_CMDLINE "console=ttyMSM0,115200 root=/dev/mmcblk0p1 rw rootwait"
./scripts/config --set-str CONFIG_CMDLINE_FROM_BOOTLOADER "y"
./scripts/config --set-str CONFIG_CMDLINE_EXTEND "y"

# Enable initramfs support
echo "Enabling initramfs support..."
./scripts/config --enable CONFIG_BLK_DEV_INITRD
./scripts/config --set-str CONFIG_INITRAMFS_SOURCE ""
./scripts/config --set-val CONFIG_INITRAMFS_ROOT_UID 0
./scripts/config --set-val CONFIG_INITRAMFS_ROOT_GID 0

# Apply configuration
echo "Applying configuration..."
make olddefconfig

# Build kernel
echo "Building kernel..."
make -j$(nproc) zImage

# Build device tree
echo "Building device tree..."
make dtbs

echo "Kernel build complete!"
echo "Files created:"
echo "  - arch/arm/boot/zImage (kernel image)"
echo "  - arch/arm/boot/dts/qcom/qcom-msm8960-blackberry-q20-simple.dtb (device tree)"