kernel/configs/qemu-busybox-min.config


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# This is a minimal configuration for running a busybox initramfs image with
# networking support.
#
# The following command can be used create the configuration for a minimal
# kernel image:
#
# make allnoconfig qemu-busybox-min.config
#
# The following command can be used to build the configuration for a default
# kernel image:
#
# make defconfig qemu-busybox-min.config
#
# On x86, the following command can be used to run qemu:
#
# qemu-system-x86_64 -nographic -kernel vmlinux -initrd initrd.img -nic user,model=rtl8139,hostfwd=tcp::5555-:23
#
# On arm64, the following command can be used to run qemu:
#
# qemu-system-aarch64 -M virt -cpu cortex-a72 -nographic -kernel arch/arm64/boot/Image -initrd initrd.img -nic user,model=rtl8139,hostfwd=tcp::5555-:23

CONFIG_SMP=y
CONFIG_PRINTK=y
CONFIG_PRINTK_TIME=y

CONFIG_PCI=y

# We use an initramfs for busybox with elf binaries in it.
CONFIG_BLK_DEV_INITRD=y
CONFIG_RD_GZIP=y
CONFIG_BINFMT_ELF=y

# This is for /dev file system.
CONFIG_DEVTMPFS=y

# Core networking (packet is for dhcp).
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_INET=y

# RTL8139 NIC support.
CONFIG_NETDEVICES=y
CONFIG_ETHERNET=y
CONFIG_NET_VENDOR_REALTEK=y
CONFIG_8139CP=y

# To get GDB symbols and script.
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
CONFIG_GDB_SCRIPTS=y

# For the power-down button (triggered by qemu's `system_powerdown` command).
CONFIG_INPUT=y
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_KEYBOARD=y