2020年04月01日 | S5PV210的NandFlash应用(一)

准备分析

标题挂了一个（一），代表这个是涉及到NandFlash并不深入，只实现读操作。还是16k的代码，这次从NandFlash中读取，读到iRAM中地址为0xD0024000的地方。并调用main运行。如下图所示：（CPU会自动把B区代码拷贝到A区，我用A区代码从将B区代码拷贝到C区，并调用main运行）

资源工具

同《 S5PV210的LED应用(一)》

NandFlash: K9GAG08U0F (2G)

着手写程序

start.S中的代码拷贝很重要，Makefile中的链接地址很重要。

/*

 * $Id: nand_cp.c,v 1.1 2008/11/20 01:08:36 boyko Exp $

 *

 * (C) Copyright 2006 Samsung Electronics

 *

 * 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

 */

/*

 * You must make sure that all functions in this file are designed

 * to load only U-Boot image.

 *

 * So, DO NOT USE in common read.

 *

 * By scsuh.

 */

/*

 * Standard NAND flash commands

 */

#define NAND_CMD_READ0 0

#define NAND_CMD_READ1 1

#define NAND_CMD_RNDOUT 5

#define NAND_CMD_PAGEPROG 0x10

#define NAND_CMD_READOOB 0x50

#define NAND_CMD_ERASE1 0x60

#define NAND_CMD_STATUS 0x70

#define NAND_CMD_STATUS_MULTI 0x71

#define NAND_CMD_SEQIN 0x80

#define NAND_CMD_RNDIN 0x85

#define NAND_CMD_READID 0x90

#define NAND_CMD_PARAM 0xec

#define NAND_CMD_ERASE2 0xd0

#define NAND_CMD_RESET 0xff

/* Extended commands for large page devices */

#define NAND_CMD_READSTART 0x30

#define NAND_CMD_RNDOUTSTART 0xE0

#define NAND_CMD_CACHEDPROG 0x15

#define NAND_DISABLE_CE() (NFCONT_REG |= (1 << 1))

#define NAND_ENABLE_CE() (NFCONT_REG &= ~(1 << 1))

#define NF_TRANSRnB() do { while(!(NFSTAT_REG & (1 << 0))); } while(0)

//#include

//#include

#include "s5pc110.h"

#define COPY_BL2_SIZE 0x80000

#define NAND_CONTROL_ENABLE() (NFCONT_REG |= (1 << 0))

/*

 * address format

 *              17 16         9 8            0

 * --------------------------------------------

 * | block(12bit) | page(5bit) | offset(9bit) |

 * --------------------------------------------

 */

static int nandll_read_page (uchar *buf, ulong addr, int large_block)

{

int i;

int page_size = 512;

if (1 == large_block)

page_size = 2048;

else if (2 == large_block)

page_size = 8192;

NAND_ENABLE_CE();

NFCMD_REG = NAND_CMD_READ0;

/* Write Address */

NFADDR_REG = 0;

if (large_block)

NFADDR_REG = 0;

NFADDR_REG = (addr) & 0xff;

NFADDR_REG = (addr >> 8) & 0xff;

NFADDR_REG = (addr >> 16) & 0xff;

if (large_block)

NFCMD_REG = NAND_CMD_READSTART;

        NF_TRANSRnB();

/* for compatibility(2460). u32 cannot be used. by scsuh */

for(i=0; i < page_size; i++) {

                *buf++ = NFDATA8_REG;

        }

        NAND_DISABLE_CE();

        return 0;

}

/*

 * Read data from NAND.

 */

static int nandll_read_blocks (ulong dst_addr, ulong size, int large_block)

{

uchar *buf = (uchar *)dst_addr;

int i;

uint page_shift = 9;

if (1 == large_block)

{

page_shift = 11;

/* Read pages */

for (i = (0x6000>>page_shift); i < (size>>page_shift); i++, buf+=(1< {

nandll_read_page(buf, i, large_block);

}

}

else if(2 == large_block)

{

page_shift = 12;

for (i = 0; i < (size>>page_shift); i++, buf+=(1<<(page_shift-1))) 

{

        nandll_read_page(buf, i, large_block);

}

}

return 0;

}

int copy_uboot_to_ram_nand (void)

{

int large_block = 0;

int i;

vu_char id;

NAND_CONTROL_ENABLE();

        NAND_ENABLE_CE();

        NFCMD_REG = NAND_CMD_READID;

        NFADDR_REG =  0x00;

/* wait for a while */

        for (i=0; i<200; i++);

id = NFDATA8_REG;

id = NFDATA8_REG;

if (id > 0x80)

large_block = 1;

if(id == 0xd5)

{

large_block = 2;

}

/* read NAND Block.

* 128KB ->240KB because of U-Boot size increase. by scsuh

* So, read 0x3c000 bytes not 0x20000(128KB).

*/

//return nandll_read_blocks(CONFIG_SYS_TEXT_BASE, COPY_BL2_SIZE, large_block);

return nandll_read_blocks(0xd0024000, 0x4000, large_block);

}

void board_init_f_nand(unsigned long bootflag)

{

        __attribute__((noreturn)) void (*uboot)(void);

        copy_uboot_to_ram_nand();

        /* Jump to U-Boot image */

        uboot = (void *)0xd024010;

(*uboot)();

        /* Never returns Here */

}

@******************************************************************************

@ File：start.S

@ 功能：启动代码，设置栈，拷贝16k到0xd0020000处

@******************************************************************************  

.text

.global _start

_start:

ldr sp, =0xD0037D80       @ 设置栈，以便调用c函数

adr r0, _start        @ 重定位

                            @ _start当前所位于的地址：0xd0020010 (前边放有16bit的头信息)

ldr r1, =_start           @ _start的链接地址:0xd0024010

ldr r2, =0xd0028000       @ 0xd0028000 = 0xd0024000 + 0x4000(16k) 

cmp r0, r1

beq run_on_dram

bl  nand_asm_init

bl  copy_uboot_to_ram_nand

run_on_dram:  

ldr pc, =main             @ 跳转

halt:

b halt

led_debug:     

ldr     R0,=0xE0200280      @ R0设为GPJ2CON寄存器。此寄存器

                                        @ 用于选择端口J各引脚的功能：

                                        @ 是输出、是输入、还是其他

mov     R1,#0x00000001        

str     R1,[R0]             @ 设置GPJ2_0为输出口, 位[10:9]=0b01

ldr     R0,=0xE0200284      @ R0设为GPJ2DAT寄存器。此寄存器

                                        @ 用于读/写端口GPJ2各引脚的数据

mov     R1,#0x00000000      @ 此值改为0x00000001,

                                        @ 可让LED1熄灭

str     R1,[R0]             @ GPJ2_0输出0，LED1点亮

mov pc, lr

/* Setting GPIO for NAND */

/* This setting is NAND initialze code at booting time in iROM. */

nand_asm_init:

/*

 * Nand Interface Init for SMDKC110

 */

#define ELFIN_GPIO_BASE 0xE0200000 

#define ELFIN_NAND_BASE 0xB0E00000

#define NFCONF_VAL (7<<12)|(7<<8)|(7<<4)|(0<<3)|(0<<2)|(1<<1)|(0<<0)

#define NFCONT_VAL      (0x1<<23)|(0x1<<22)|(0<<18)|(0<<17)|(0<<16)|(0<<10)|(0<<9)|(0<<8)|(0<<7)|(0<<6)|(0x2<<1)|(1<<0)

#define MP01CON_OFFSET 0x2E0

#define MP01PUD_OFFSET 0x2E8

#define MP03CON_OFFSET      0x320

#define MP03PUD_OFFSET      0x328

#define NFCONF_OFFSET       0x00

#define NFCONT_OFFSET       0x04

ldr r0, =ELFIN_GPIO_BASE

ldr r1, [r0, #MP01CON_OFFSET]

bic r1, r1, #(0xf<<8)

orr r1, r1, #(0x3<<8)

str r1, [r0, #MP01CON_OFFSET]

ldr r1, [r0, #MP01PUD_OFFSET]

bic r1, r1, #(0x3<<4)

str r1, [r0, #MP01PUD_OFFSET]

ldr r1, [r0, #MP03CON_OFFSET]

bic r1, r1, #0xFFFFFF

ldr r2, =0x22222222

orr r1, r1, r2

str r1, [r0, #MP03CON_OFFSET]

ldr r1, [r0, #MP03PUD_OFFSET]

ldr r2, =0x3fff

bic r1, r1, r2

str r1, [r0, #MP03PUD_OFFSET]

ldr r0, =ELFIN_NAND_BASE

ldr r1, [r0, #NFCONF_OFFSET]

ldr r2, =0x777F

bic r1, r1, r2

ldr r2, =NFCONF_VAL

orr r1, r1, r2

str r1, [r0, #NFCONF_OFFSET]

ldr r1, [r0, #NFCONT_OFFSET]

ldr r2, =0x707C7

bic r1, r1, r2

ldr r2, =NFCONT_VAL

orr r1, r1, r2

str r1, [r0, #NFCONT_OFFSET]

ldr r1, [r0, #NFCONF_OFFSET]

orr r1, r1, #0x70

orr r1, r1, #0x7700

str     r1, [r0, #NFCONF_OFFSET]

ldr r1, [r0, #NFCONT_OFFSET]

orr r1, r1, #0x03

str     r1, [r0, #NFCONT_OFFSET]

mov pc, lr

main.c

#define GPJ2CON (*(volatile unsigned long *) 0xE0200280)

#define GPJ2DAT (*(volatile unsigned long *) 0xE0200284)

// 延时函数

void delay(unsigned long count)

{

volatile unsigned long i = count;

while (i--)

;

}

void main() //LED 闪烁

{

GPJ2CON = 0x00001111; // 配置引脚

while(1) // 闪烁

{

GPJ2DAT = 0; // LED on

delay(0x100000);

GPJ2DAT = 0xf; // LED off

delay(0x100000);

}

}

下载运行

同《 S5PV210的LED应用(一)》

运行调试

一开始以为程序会很难，应该MLC的，这样的NandFlash涉及到了ECC校验，颇为麻烦，但是细想，只实现读操作，会少许简单一些。最后发现读的时候问题并不多。也并不是那么困难。nand_asm_init和nand_cp.c提取于u-boot，并加以移植。

遗留问题

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