config root man

/*-
 * Copyright (c) 2006 Olivier Houchard
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/xscale/i8134x/i81342_mcu.c 187340 2009-01-16 19:31:27Z cognet $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>

#include <machine/bus.h>
#include <arm/xscale/i8134x/i81342reg.h>
#include <arm/xscale/i8134x/i81342var.h>

void
i81342_sdram_bounds(bus_space_tag_t bt, bus_space_handle_t bh, 
    vm_paddr_t *start, vm_size_t *size)
{
	uint32_t reg;
	int bank_nb;

	reg = bus_space_read_4(bt, bh, SMC_SDBR);
	*start = (reg & SMC_SDBR_BASEADDR_MASK);
	reg = bus_space_read_4(bt, bh, SMC_SBSR);
	if (reg & SMC_SBSR_BANK_NB)
		bank_nb = 1;
	else
		bank_nb = 2;
	
	*size = (reg & SMC_SBSR_BANK_SZ_MASK) * bank_nb;
}