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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.

/*-
 * Copyright (c) 2005-2007, Kohsuke Ohtani
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * main.c - driver main routine
 */

#include <driver.h>
#include <machdep.h>

#define MAXDRIVER	100

#ifndef CONFIG_AUTOCONF
extern struct driver *driver_table[];
#endif

/*
 * Entry point of driver module
 */
void
driver_main(void)
{
	struct driver *drv;
	int order, i, err;

	printk("Prex driver module built: " __DATE__ "\n");

	/*
	 * Initialize platform hardware.
	 */
	if (machine_init())
		panic("driver_main: init failed");

#ifndef CONFIG_AUTOCONF
	/*
	 * Call init routine for all device drivers with init order.
	 * Smaller value will be run first.
	 */
	for (order = 0; order < 16; order++) {
		for (i = 0; i < MAXDRIVER; i++) {
			drv = driver_table[i];
			if (drv == NULL)
				break;
			ASSERT(drv->order < 16);
			if (drv->order == order) {
				if (drv->init) {
					printk("Initializing %s\n", drv->name);
					err = drv->init();
				}
			}
		}
	}
#else
	/*
	 * Enter autoconfiguration machinery.
	 * Attach 'root' pseudo device, which will then search for its children.
	 */
	printk("Entering autoconfiguration phase.\n");

	config_attach_rootdev();

	printk("Exiting autoconfiguration phase.\n");

#endif /* !CONFIG_AUTOCONF */

}