OK6410（256M RAM ，1G SLC NAND）Uboot-2013-04移植（2）--完善SD卡启动

1.解决Flash: *** failed ***

    修改arch/arm/lib/board.c，把第588行的hang()注释掉，587行的puts(failed);改为puts("0 MiB\n");

    重新make all 后烧写，结果如下

    

2.解决raise: Signal # 8 caught
    修改arch/arm/cpu/arm1176/s3c64xx/timer.c，如下

/*
 * (C) Copyright 2003
 * Texas Instruments <www.ti.com>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <[e-mail]>
 *
 * (C) Copyright 2002-2004
 * Gary Jennejohn, DENX Software Engineering, <[e-mail]>
 *
 * (C) Copyright 2004
 * Philippe Robin, ARM Ltd. <[e-mail]>
 *
 * (C) Copyright 2008
 * Guennadi Liakhovetki, DENX Software Engineering, <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.     See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/proc-armv/ptrace.h>
#ifdef  CONFIG_S3C6400
#include <asm/arch/s3c6400.h>
#else
#include <asm/arch/s3c6410.h>
#endif
#include <div64.h>

//static ulong gd->arch.timer_rate_hz ;
DECLARE_GLOBAL_DATA_PTR;

#define PRESCALER    167

static s3c64xx_timers *s3c64xx_get_base_timers(void)
{
    return (s3c64xx_timers *)ELFIN_TIMER_BASE;
}

/* macro to read the 16 bit timer */
static inline ulong read_timer(void)
{
    s3c64xx_timers *const timers = s3c64xx_get_base_timers();

    return timers->TCNTO4;
}

/* Internal tick units */
/* Last decremneter snapshot */
//static unsigned long lastdec;
/* Monotonic incrementing timer */
//static unsigned long long timestamp;

int timer_init(void)
{
    s3c64xx_timers *const timers = s3c64xx_get_base_timers();

    /* use PWM Timer 4 because it has no output */
    /*
     * We use the following scheme for the timer:
     * Prescaler is hard fixed at 167, divider at 1/4.
     * This gives at PCLK frequency 66MHz approx. 10us ticks
     * The timer is set to wrap after 100s, at 66MHz this obviously
     * happens after 10,000,000 ticks. A long variable can thus
     * keep values up to 40,000s, i.e., 11 hours. This should be
     * enough for most uses:-) Possible optimizations: select a
     * binary-friendly frequency, e.g., 1ms / 128. Also calculate
     * the prescaler automatically for other PCLK frequencies.
     */
    timers->TCFG0 = PRESCALER << 8;
    if (gd->arch.timer_rate_hz == 0) {
        //gd->arch.timer_rate_hz = get_PCLK() / PRESCALER * (100 / 4); /* 100s */
        gd->arch.timer_rate_hz = get_PCLK() / PRESCALER * (100 / 4);
        timers->TCFG1 = (timers->TCFG1 & ~0xf0000) | 0x20000;
    }

    /* load value for 10 ms timeout */
    //gd->arch.lastinc = timers->TCNTB4 = gd->arch.timer_rate_hz ;
    gd->arch.lastinc =timers->TCNTB4 =gd->arch.timer_rate_hz;
    /* auto load, manual update of Timer 4 */
    timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO |
        TCON_4_UPDATE;

    /* auto load, start Timer 4 */
    timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO | COUNT_4_ON;
    //timestamp= 0;
    gd->arch.timer_reset_value=0;
    return 0;
}

/*
 * timer without interrupts
 */

/*
 * This function is derived from PowerPC code (read timebase as long long).
 * On ARM it just returns the timer value.
 */
unsigned long long get_ticks(void)
{
    ulong now = read_timer();

    if (gd->arch.lastinc >= now) {
        /* normal mode */
        gd->arch.timer_reset_value+= gd->arch.lastinc - now;
    } else {
        /* we have an overflow ... */
        gd->arch.timer_reset_value+= gd->arch.lastinc + gd->arch.timer_rate_hz - now;
    }
    gd->arch.lastinc = now;

    return gd->arch.timer_reset_value;
}

/*
 * This function is derived from PowerPC code (timebase clock frequency).
 * On ARM it returns the number of timer ticks per second.
 */
ulong get_tbclk(void)
{
    /* We overrun in 100s */
    return (ulong)(gd->arch.timer_rate_hz / 100);
}

ulong get_timer_masked(void)
{
    unsigned long long res = get_ticks();
    do_div (res, (gd->arch.timer_rate_hz / (100 * CONFIG_SYS_HZ)));
    return res;
}

ulong get_timer(ulong base)
{
    return get_timer_masked() - base;
}

void __udelay(unsigned long usec)
{
    unsigned long long tmp;
    ulong tmo;

    tmo = (usec + 9) / 10;
    tmp = get_ticks() + tmo;    /* get current timestamp*/

    while (get_ticks() < tmp)/* loop till event */
         /*NOP*/;
}

        重新make all 后烧写，结果如下

        

3.解决NAND: No NAND device found!!!

    修改drivers/mtd/nand/nand_ids.c，在/* 8 Gigabit */后添加

            {"NAND 1GiB 1,8V 8-bit", 0x38, 4096, 1024, 512*1024, LP_OPTIONS},//MT

    重新编译烧写后显示