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Heads up! Implement universal device attachment and autoconfiguration machinery.
This is somewhat similar to traditional BSD autoconf but much more simple.
Three basic data structures involved in autoconfiguration process are:
struct device, which represents abstract device and its private (driver softc) data;
struct driver, which holds {attach,match,detach} entries, name and softc size;
struct attachment, which tells us how drivers are interacted with each other.
Attachment basically describes how to attach devices in system.
Machine specified part should export arrays config_table[] and *drivers[] for config.

This might have broken i386 & gba tree, but there is only a question of time.

#
# System configuration file.
#

#
# Tunable paramters
#
CONFIG_HZ=100			# Ticks/second of the clock
CONFIG_TIME_SLICE=100		# Context switch ratio (msec)
CONFIG_PAGE_SIZE=1024		# Physical/logical page size
CONFIG_KSTACK_SIZE=768		# Kernel stack size
CONFIG_USTACK_SIZE=4096		# User stack size
CONFIG_USER_PRIO=200		# Default priority for user threads
CONFIG_OPEN_MAX=8		# Max open files per process
CONFIG_BUF_CACHE=8		# Blocks for buffer cache
CONFIG_FS_THREADS=1		# Number of file system threads

#
# Platform settings
#
CONFIG_MMU=n			# Memory management unit
CONFIG_CACHE=n			# Cache memory
CONFIG_FPU=n			# Floating point unit
CONFIG_XIP=y			# Execution in place
CONFIG_LITTLE_ENDIAN=y		# Byte order
CONFIG_BIG_ENDIAN=n		# Byte order
CONFIG_ROM_BOOT=n		# Boot from ROM

#
# Device drivers
#
CONFIG_AUTOCONF=y		# Use BSD-style autoconfiguration procedure
CONFIG_KEYBOARD=n		# Keyboard
CONFIG_CONSOLE=n		# Console
CONFIG_FDD=n			# Floppy disk drive
CONFIG_MOUSE=n			# Mouse
CONFIG_RTC=n			# Real time clock
CONFIG_RAMDISK=y		# RAM disk
CONFIG_TTY=n			# TTY driver
CONFIG_PM=n			# Power management
CONFIG_CPUFREQ=n		# CPU frequency control
CONFIG_KEYPAD=n			# Keypad
CONFIG_SAPMC=y			# StrongARM Core Frequency control

#
# Power management
#
CONFIG_PM_POWERSAVE=n		# Power policy: Battery optimized
CONFIG_PM_PERFORMANCE=n		# Power policy: Parformance optimized
CONFIG_DVS_EMULATION=n		# Dynamic voltage scaling emulation

#
# Diagnostic options
#
CONFIG_DIAG_SCREEN=n		# Diagnostic via screen
CONFIG_BOOTUART=0			# Bootstrap USART device no. (0 | 1)

#
# Kernel hacking
#
CONFIG_KDUMP=n			# Kernel dump
CONFIG_DMESG=n			# Enable ring buffer for diagnostic message
CONFIG_GDB=n			# GDB stub
CONFIG_VMTRACE=n		# Trace virtual memory allocation
CONFIG_MIN_MEMORY=n		# Test under limited memory size

#
# File system
#
CONFIG_DEVFS=y			# Device file system
CONFIG_RAMFS=y			# RAM file system
CONFIG_ARFS=y			# Archive file system
CONFIG_FATFS=n			# FAT file system

#
# Executable file formats
#
CONFIG_ELF=y			# ELF file format