build-custom-kernel.txt

PREPARE A CUSTOM KERNEL
=======================

From the kernel source directory, execute:
$ make tinyconfig

Then, execute 'make menuconfig' and enable the following options:

Kernel hacking > x86 Debugging
	* printk and demsg options
		* Show timing information on printks
		* Set Default console loglevel and Default message log level to 7
	* Compile-time checks and compiler options
		* Debug information (Rely on the toolchain's implicit default DWARF version)
		* Generate BTF typeinfo
	* Generic Kernel Debugging Instruments
		* Magic SysRq key
		* Debug Filesystem
		* KGDB: kernel debugger
	* Tracers
	* x86 Debugging
		* Enable verbose x86 bootup messages
		* Early printk

General setup
	* Configure standard kernel features (expert users):
		* Multiple users, groups and capabilities support
		* open by fhandle syscalls
		* Posix clocks and timers
		* Enable support for printk
		* BUG() support
		* Enable futex support
		* Enable eventpoll support
		* Enable signalfd() system call
		* Enable timerfd() system call
		* Enable eventfd() system call
		* Use full shmem filesystem
		* Enable AIO support
		* Load all symbols for debugging/ksymoops
	* BPF subsystem
		* Enable BPF Just In Time compiler
		* Disable unprivileged BPF by default
		* Enable BPF LSM Instrumentation
	* CPU/Task time and stats accounting
		* Pressure stall information tracking
	* Control Group support
		* CPU Controller
			* CPU Bandwidth provisioning for FAIR_GROUP_SCHED
		* Support for eBPF programs attached to cgroups
	* Namespaces support
	* Initial RAM filesystem and RAM disk (initramfs/initrd) support
	* Enable kcmp() system call

64-bit kernel

Processor type and features
	* Symmetric multi-processing support
	* Linux guest support
		* Enable paravirtualization code
		* KVM Guest support (including kvmclock)
	* Enable DMI scanning
	* EFI runtime service support

Power Management and ACPI options
	* ACPI (Advanced Configuration and Power Interface) Support

Binary emulations
	* IA32 Emulation
	* x32 ABI for 64-bit mode

Virtualization

General architecture-dependent options
	* Enable seccomp to safely execute untrusted bytecode

Enable loadable module support

Enable the block layer
	* Partition Types
		* Advanced partition selection
			* PC BIOS (MSDOS partition tables) support
			* EFI GUID Partition support

Executable file formats
	* Kernel support for ELF binaries
	* Kernel support for scripts starting with #!
	* Kernel support for MISC binaries

Networking support
	* Networking options
		* Packet socket
		* UNIX domain sockets
		* TCP/IP networking
		* Network packet filtering framework (Netfilter)

File systems
	* Second extended fs support
	* The Extended 3 (ext3) file system
		* Ext3 POSIX Access Control Lists
	* The Extended 4 (ext4) filesystem
		* Ext4 POSIX Access Control Lists
	* Kernel automounter support (supports v3, v4 and v5)
	* Enable POSIX file locking API
	* Inotify support for userspace
	* Pseudo filesystems:
		* /proc file system support
		* Sysctl support (/proc/sys)
		* sysfs file system support
		* Tmpfs virtual memory file system support (former shm fs)
			* Tmpfs POSIX Access Control Lists
		* EFI variable filesystem

Security options
	* Enable different security models

Device Drivers
	* PCI support
	* Generic Driver Options
		* Maintain a devtmpfs filesystem to mount at /dev
		* Automount devtmpfs at /dev, after the kernel mounted the rootfs
		* Firmware loader
			* Firmware loading facility
			* Enable users to initiate firmware updates using sysfs
	* Firmware Drivers
		* Add firmware-provided memory map to sysfs
		* Export DMI identification via sysfs to userspace
		* DMI table support in sysfs
		* QEMU fw_cfg device support in sysfs
			* QEMU fw_cfg device parameter parsing
	* Virtio drivers:
		* PCI driver for virtio devices
	* Block devices
		* Virtio block driver
	* SCSI device support
		* SCSI disk support
	* Serial ATA and Parallel ATA drivers (libata)
		* Intel ESB, ICH, PIIX3, PIIX4 PATA/SATA support
	* Network device support
		* Virtio network driver
		* Ethernet driver support
			* Intel devices
				* Intel(R) PRO/100+ support
				* Intel(R) PRO/1000 Gigabit Ethernet support
				* Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support
	* Character Devices
		* Enable TTY
		* Virtual terminal
			* Enable character translations in console
			* Support for console on virtual terminals
		* Unix98 PTY support
		* Legacy (BSD) PTY support
		* TTY driver to output user messages via printk
		* Serial drivers
			* 8250/16550 and compatible serial support
			* Console on 8250/16550 and compatible serial port

Finally, build the kernel with "make bzImage modules"