Inird hardcoded, TODO add run option

buildroot_config_fragment

@@ -6,6 +6,8 @@ BR2_PACKAGE_STRACE=y
 BR2_ROOTFS_OVERLAY="../rootfs_overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="../rootfs_post_build_script"
 BR2_ROOTFS_USERS_TABLES="../user_table"
+# Generate output/images/rootfs.cpio
+BR2_TARGET_ROOTFS_CPIO=y
 
 # Host GDB
 BR2_GDB_VERSION="7.11.1"

kernel_config_fragment

@@ -8,6 +8,8 @@ CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_GDB_SCRIPTS=y
+# Allow kernel to understand -initrd
+CONFIG_BLK_DEV_INITRD=y
 
 # Non-static variables show up on /proc/kallsyms
 # https://stackoverflow.com/questions/20196636/does-kallsyms-have-all-the-symbol-of-kernel-functions/44614878#44614878

run

@@ -62,14 +62,15 @@ case "$arch" in
     fi
     cmd="$qemu_common \
 -M pc \
--append 'root=/dev/vda nopat $extra_append' \
+-append 'nopat $extra_append' \
 -device edu \
 -device lkmc_pci_min \
 -device virtio-net-pci,netdev=net0 \
--drive file=${images_dir}/rootfs.ext2,if=virtio,format=raw \
+-initrd ${images_dir}/rootfs.cpio \
 -kernel ${images_dir}/bzImage \
 $extra_flags \
 "
+#-drive file=${images_dir}/rootfs.ext2,if=virtio,format=raw \
   ;;
   arm)
     if $kgdb; then