From 1fa0293b80683810063cc44311150bc218223168 Mon Sep 17 00:00:00 2001
From: Levent Kaya <levent.kaya@codefirst.io>
Date: Tue, 26 Nov 2024 16:23:19 +0300
Subject: [build] run with precompiled kernel

---
 fbgl_qemu_test_env.sh | 97 +++++++++++++++++++++++----------------------------
 1 file changed, 44 insertions(+), 53 deletions(-)

(limited to 'fbgl_qemu_test_env.sh')

diff --git a/fbgl_qemu_test_env.sh b/fbgl_qemu_test_env.sh
index 384ac4b..9957e1a 100644
--- a/fbgl_qemu_test_env.sh
+++ b/fbgl_qemu_test_env.sh
@@ -1,79 +1,70 @@
 #!/bin/bash
 
 # Variables
-BUSYBOX_DIR="busybox_root"   # Directory for BusyBox root filesystem
-BINARY="fbgl_test"           # Precompiled binary
-TARGET_DIR="/mnt/root"       # Target directory for binary on BusyBox
-BUSYBOX_IMAGE="busybox.img"  # Image file for BusyBox environment
-LOOP_DEVICE="/dev/loop0"     # Loop device for BusyBox image
+BUSYBOX_VERSION="1.36.0"               # BusyBox version to download
+PRECOMPILED_KERNEL="https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.5.9.tar.xz"
+BUSYBOX_DIR="busybox_root"             # Directory for BusyBox root filesystem
+BINARY="fbgl_test"                     # Precompiled binary
+BUSYBOX_IMAGE="busybox.img"            # Image file for BusyBox environment
+TARGET_DIR="/mnt/root"                 # Mount point for the BusyBox image
+KERNEL_FILE="vmlinuz"                  # Precompiled kernel file
 
 # Ensure dependencies are installed
-if ! command -v qemu-system-x86_64 &>/dev/null; then
-  echo "Please install QEMU to run BusyBox."
-  exit 1
-fi
-
-if ! command -v losetup &>/dev/null; then
-  echo "Please install losetup for loop device setup."
-  exit 1
-fi
+REQUIRED_TOOLS=("wget" "qemu-system-x86_64" "dd" "mkfs.ext4" "mount" "losetup")
+for tool in "${REQUIRED_TOOLS[@]}"; do
+    if ! command -v $tool &>/dev/null; then
+        echo "Error: $tool is required but not installed. Please install it first."
+        exit 1
+    fi
+done
 
-# 1. Create a Minimal BusyBox Environment
+# Step 1: Download and Build BusyBox
 echo "Setting up BusyBox environment..."
-
-# Download and build BusyBox
-if [ ! -d "busybox" ]; then
-  git clone https://git.busybox.net/busybox
+if [ ! -d "busybox-${BUSYBOX_VERSION}" ]; then
+    wget https://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2
+    tar -xf busybox-${BUSYBOX_VERSION}.tar.bz2
 fi
-cd busybox || exit
+cd busybox-${BUSYBOX_VERSION}
 make defconfig
 sed -i 's/# CONFIG_STATIC/CONFIG_STATIC=y/' .config  # Enable static binary
-make -j$(nproc)
+make -j$(nproc) install CONFIG_PREFIX=../$BUSYBOX_DIR
 cd ..
 
-# Create root filesystem
-mkdir -p $BUSYBOX_DIR/{bin,dev,etc,proc,sys,usr}
-
-# Install BusyBox binaries
-cp busybox/busybox $BUSYBOX_DIR/bin/
-chroot $BUSYBOX_DIR /bin/busybox --install -s
-
-# Add init script
-cat <<EOF >$BUSYBOX_DIR/init
-#!/bin/sh
+# Step 2: Set Up BusyBox Root Filesystem
+echo "Creating BusyBox root filesystem..."
+mkdir -p $BUSYBOX_DIR/{dev,proc,sys,root}
+sudo mknod -m 666 $BUSYBOX_DIR/dev/console c 5 1
+sudo mknod -m 666 $BUSYBOX_DIR/dev/null c 1 3
+echo "#!/bin/sh
 mount -t proc none /proc
 mount -t sysfs none /sys
-exec /bin/sh
-EOF
+exec /bin/sh" > $BUSYBOX_DIR/init
 chmod +x $BUSYBOX_DIR/init
 
-# Create device nodes
-sudo mknod $BUSYBOX_DIR/dev/console c 5 1
-sudo mknod $BUSYBOX_DIR/dev/null c 1 3
-
-# 2. Prepare Framebuffer
-echo "Setting up framebuffer support..."
-sudo mknod $BUSYBOX_DIR/dev/fb0 c 29 0
-
-# 3. Create Image File
-echo "Creating BusyBox disk image..."
+# Step 3: Create and Format Disk Image
+echo "Creating and formatting disk image..."
 dd if=/dev/zero of=$BUSYBOX_IMAGE bs=1M count=64
 mkfs.ext4 $BUSYBOX_IMAGE
 sudo mount -o loop $BUSYBOX_IMAGE $TARGET_DIR
 sudo cp -r $BUSYBOX_DIR/* $TARGET_DIR/
 sudo umount $TARGET_DIR
 
-# 4. Transfer Precompiled Binary
-echo "Transferring binary to BusyBox environment..."
+# Step 4: Download Precompiled Kernel
+if [ ! -f "$KERNEL_FILE" ]; then
+    echo "Downloading precompiled kernel..."
+    wget -O $KERNEL_FILE $PRECOMPILED_KERNEL
+fi
+
+# Step 5: Transfer Precompiled Binary to BusyBox
+echo "Transferring binary to BusyBox..."
 sudo mount -o loop $BUSYBOX_IMAGE $TARGET_DIR
 sudo cp $BINARY $TARGET_DIR/bin/
 sudo umount $TARGET_DIR
 
-# 5. Run in QEMU
-echo "Starting BusyBox in QEMU with framebuffer..."
-qemu-system-x86_64 -kernel busybox/arch/x86/boot/bzImage \
-  -append "root=/dev/sda console=ttyS0" \
-  -hda $BUSYBOX_IMAGE \
-  -nographic
-
-echo "BusyBox environment setup complete."
+# Step 6: Boot with QEMU
+echo "Booting BusyBox with QEMU..."
+qemu-system-x86_64 \
+    -kernel $KERNEL_FILE \
+    -append "root=/dev/sda console=ttyS0 init=/init" \
+    -hda $BUSYBOX_IMAGE \
+    -nographic
-- 
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