Fix GRUB boot configuration to resolve flashing cursor issue

- Add terminal and video output configuration in embedded GRUB config
- Load essential GRUB modules (part_gpt, fat, ext2, linux, video drivers)
- Enhance main GRUB config with proper terminal setup and multiple boot options
- Add verbose and recovery mode boot menu entries
- Remove 'quiet' parameter to show boot messages for debugging
- Add console output to both tty0 and serial console
- Include modules in grub-mkstandalone for better hardware compatibility

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

scripts/docker-image-create-uefi.sh

@@ -21,11 +21,13 @@ mkdir -p /staging/esp/boot/grub
 sed "s/@ESP_LABEL@/$ESP_LABEL/g" /build/config/grub-embedded.cfg.in > /tmp/embedded_grub.cfg
 
 # Create GRUB EFI binary using grub-mkstandalone with embedded bootstrap config
+# Include essential modules for better hardware compatibility
 grub-mkstandalone \
     --format=x86_64-efi \
     --output=/staging/esp/EFI/BOOT/BOOTX64.EFI \
     --locales="" \
     --fonts="" \
+    --modules="part_gpt part_msdos fat ext2 normal linux all_video video_bochs video_cirrus gfxterm search search_label search_fs_uuid" \
     "boot/grub/grub.cfg=/tmp/embedded_grub.cfg"
 
 # Find the kernel
@@ -39,14 +41,53 @@ cp $KERNEL_PATH /staging/esp/boot/vmlinuz
 if [ -f "$INITRD_PATH" ]; then cp $INITRD_PATH /staging/esp/boot/initrd.img; fi
 
 # Create GRUB configuration for immutable root with overlay
-printf '%s\n' \
-    'set timeout=3' \
-    'set default=0' \
-    '' \
-    "menuentry \"SparkOS (Immutable Base + Overlay)\" {" \
-    "    linux /boot/vmlinuz root=LABEL=$ROOT_LABEL ro init=/sbin/init console=tty1 quiet" \
-    '}' \
-    > /staging/esp/boot/grub/grub.cfg
+cat > /staging/esp/boot/grub/grub.cfg << EOF
+# GRUB Configuration for SparkOS
+
+# Load essential modules
+insmod part_gpt
+insmod fat
+insmod ext2
+insmod linux
+insmod all_video
+insmod video_bochs
+insmod video_cirrus
+insmod gfxterm
+
+# Set terminal and video modes
+terminal_input console
+terminal_output console
+set gfxmode=auto
+set gfxpayload=keep
+
+# Boot menu settings
+set timeout=5
+set default=0
+
+# Show countdown message
+echo "SparkOS Boot Menu - Starting in \$timeout seconds..."
+
+menuentry "SparkOS" {
+    echo "Loading SparkOS kernel..."
+    linux /boot/vmlinuz root=LABEL=$ROOT_LABEL ro init=/sbin/init console=tty0 console=ttyS0,115200n8
+    echo "Booting..."
+    boot
+}
+
+menuentry "SparkOS (Verbose Mode)" {
+    echo "Loading SparkOS kernel in verbose mode..."
+    linux /boot/vmlinuz root=LABEL=$ROOT_LABEL ro init=/sbin/init console=tty0 console=ttyS0,115200n8 debug loglevel=7
+    echo "Booting in verbose mode..."
+    boot
+}
+
+menuentry "SparkOS (Recovery Mode)" {
+    echo "Loading SparkOS kernel in recovery mode..."
+    linux /boot/vmlinuz root=LABEL=$ROOT_LABEL rw init=/bin/sh console=tty0 console=ttyS0,115200n8
+    echo "Booting into recovery shell..."
+    boot
+}
+EOF
 
 # Prepare root filesystem contents
 echo "Preparing root filesystem..."