u-boot1.1.5-nandflash

u-boot1.5移植

系统环境：
windows XP pro2002 pack2
VMware workstation 5.5.2
linux 9.0（全安装）

编译环境：
cross-2.95.3

原文件
u-boot-1.1.4.tar.bz2
下载地址：ftp://ftp.denx.de/pub/u-boot/

移植过程：
1、参照u-boot1.5移植一文。
2、在fs2410.c修改代码

开头增加如下代码：

#include
#include
#include

最后增加如下代码：

/*
* NAND flash initialization.
*/
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
extern ulong
nand_probe(ulong physadr);


static inline void NF_Reset(void)
{
int i;

NF_SetCE(NFCE_LOW);
NF_Cmd(0xFF); /* reset command */
for(i = 0; i < 10; i++); /* tWB = 100ns. */
NF_WaitRB(); /* wait 200~500us; */
NF_SetCE(NFCE_HIGH);
}


static inline void NF_Init(void)
{
#if 0 /* a little bit too optimistic */
#define TACLS 0
#define TWRPH0 3
#define TWRPH1 0
#else
#define TACLS 0
#define TWRPH0 4
#define TWRPH1 2
#endif

NF_Conf((1<<15)|(0<<14)|(0<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0));
/*nand->NFCONF = (1<<15)|(1<<14)|(1<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); */
/* 1 1 1 1, 1 xxx, r xxx, r xxx*/
/* En 512B 4step ECCR nFCE=H tACLS tWRPH0 tWRPH1 */

NF_Reset();
}

void
nand_init(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

NF_Init();
#ifdef DEBUG
printf("NAND flash probing at 0x%.8lX\n", (ulong)nand);
#endif
printf ("%4lu MB\n", nand_probe((ulong)nand) >> 20);
}
#endif

3、在board/fs2410文件夹中增加nand_read.c文件（参照VIVI）

代码如下：

#include

#define __REGb(x) (*(volatile unsigned char *)(x))
#define __REGi(x) (*(volatile unsigned int *)(x))
#define NF_BASE 0x4e000000

#define NFCONF __REGi(NF_BASE + 0x0)
#define NFCONT __REGi(NF_BASE + 0x4)
#define NFCMD __REGb(NF_BASE + 0x8)
#define NFADDR __REGb(NF_BASE + 0xC)
#define NFDATA __REGb(NF_BASE + 0x10)
#define NFSTAT __REGb(NF_BASE + 0x20)

//#define GPDAT __REGi(GPIO_CTL_BASE+oGPIO_F+oGPIO_DAT)

#define NAND_CHIP_ENABLE (NFCONT &= ~(1<<1))
#define NAND_CHIP_DISABLE (NFCONT |= (1<<1))
#define NAND_CLEAR_RB (NFSTAT |= (1<<2))
#define NAND_DETECT_RB { while(! (NFSTAT&(1<<2)) );}

#define BUSY 4
inline void wait_idle(void) {
while(!(NFSTAT & BUSY));
NFSTAT |= BUSY;
}

#define NAND_SECTOR_SIZE 512
#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)

/* low level nand read function */
int
nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;

if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
return -1; /* invalid alignment */
}

NAND_CHIP_ENABLE;

for(i=start_addr; i < (start_addr + size);) {
/* READ0 */
NAND_CLEAR_RB;
NFCMD = 0;

/* Write Address */
NFADDR = i & 0xff;
NFADDR = (i >> 9) & 0xff;
NFADDR = (i >> 17) & 0xff;
NFADDR = (i >> 25) & 0xff;

NAND_DETECT_RB;

for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
*buf = (NFDATA & 0xff);
buf++;
}
}
NAND_CHIP_DISABLE;
return 0;
｝

4、编辑board/fs2410/Makefile

LIB = $(obj)lib$(BOARD).a

COBJS := fs2410.o nand_read.o flash.o
SOBJS := lowlevel_init.o

5、增加include/nand.h文件

编辑代码如下：

#include

extern int mem_test(unsigned long start, unsigned long ramsize,int mode);

#if (CONFIG_COMMANDS & CFG_CMD_NAND)
typedef enum {
NFCE_LOW,
NFCE_HIGH
} NFCE_STATE;

static inline void NF_Conf(u16 conf)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCONF = conf;
}

static inline void NF_Cmd(u8 cmd)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCMD = cmd;
}

static inline void NF_CmdW(u8 cmd)
{
NF_Cmd(cmd);
udelay(1);
}

static inline void NF_Addr(u8 addr)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFADDR = addr;
}

static inline void NF_SetCE(NFCE_STATE s)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

switch (s) {
case NFCE_LOW:
nand->NFCONF &= ~(1<<11);
break;

case NFCE_HIGH:
nand->NFCONF |= (1<<11);
break;
}
}

static inline void NF_WaitRB(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

while (!(nand->NFSTAT & (1<<0)));
}

static inline void NF_Write(u8 data)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFDATA = data;
}

static inline u8 NF_Read(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

return(nand->NFDATA);
}

static inline void NF_Init_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCONF |= (1<<12);
}

static inline u32 NF_Read_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

return(nand->NFECC);
}

#endif

6、编辑cpu/arm920t/start.S文件，增加nand boot 代码

……………………
/* FCLK:HCLK:PCLK = 1:2:4 */
/* default FCLK is 120 MHz ! */
ldr r0, =CLKDIVN
mov r1, #3
str r1, [r0]
/* END stuff after relocation */
#endif

#ifdef CONFIG_S3C2440_NAND_BOOT
bl copy_myself

#if 1
mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_F
mov r2, #0x00
str r2, [r1, #oGPIO_DAT]
#endif

@ jump to ram
ldr r1, =on_the_ram
add pc, r1, #0
nop
nop
1: b 1b @ infinite loop

on_the_ram:
#endif


ldr pc, _start_armboot

_start_armboot: .word start_armboot

……………………

……………………
ldr pc, _start_armboot

_start_armboot: .word start_armboot

#ifdef CONFIG_S3C2440_NAND_BOOT
copy_myself:
mov r10, lr

@ reset NAND
mov r1, #NAND_CTL_BASE
ldr r2, =( (7<<12)|(7<<8)|(7<<4)|(0<<0) )
str r2, [r1, #oNFCONF]
ldr r2, [r1, #oNFCONF]

ldr r2, =( (1<<4)|(0<<1)|(1<<0) ) @ Active low CE Control
str r2, [r1, #oNFCONT]
ldr r2, [r1, #oNFCONT]

ldr r2, =(0x6) @ RnB Clear
str r2, [r1, #oNFSTAT]
ldr r2, [r1, #oNFSTAT]
mov r2, #0xff @ RESET command
strb r2, [r1, #oNFCMD]
mov r3, #0 @ wait
1: add r3, r3, #0x1
cmp r3, #0xa
blt 1b
2: ldr r2, [r1, #oNFSTAT] @ wait ready
tst r2, #0x4
beq 2b

ldr r2, [r1, #oNFCONT]
orr r2, r2, #0x2 @ Flash Memory Chip Disable
str r2, [r1, #oNFCONT]

@ get read to call C functions (for nand_read())
ldr sp, DW_STACK_START @ setup stack pointer
mov fp, #0 @ no previous frame, so fp=0

mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_F
mov r2, #0xe0
str r2, [r1, #oGPIO_DAT]


@ copy UBOOT to RAM
ldr r0, =UBOOT_RAM_BASE
mov r1, #0x0
mov r2, #0x20000
bl nand_read_ll

#if 1
mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_F
mov r2, #0xb0
str r2, [r1, #oGPIO_DAT]
#endif


tst r0, #0x0
beq ok_nand_read
#ifdef CONFIG_DEBUG_LL
bad_nand_read:
ldr r0, STR_FAIL
ldr r1, SerBase
bl PrintWord
1: b 1b @ infinite loop
#endif
ok_nand_read:
#ifdef CONFIG_DEBUG_LL
ldr r0, STR_OK
ldr r1, SerBase
bl PrintWord
#endif

@ verify
mov r0, #0
ldr r1, =UBOOT_RAM_BASE
mov r2, #0x400 @ 4 bytes * 1024 = 4K-bytes
go_next:
ldr r3, [r0], #4
ldr r4, [r1], #4
teq r3, r4
bne notmatch
subs r2, r2, #4
beq done_nand_read
bne go_next
notmatch:
#ifdef CONFIG_DEBUG_LL
sub r0, r0, #4
ldr r1, SerBase
bl PrintHexWord
ldr r0, STR_FAIL
ldr r1, SerBase
bl PrintWord
#endif
1: b 1b
done_nand_read:

#ifdef CONFIG_DEBUG_LL
ldr r0, STR_OK
ldr r1, SerBase
bl PrintWord
#endif

#if 1
mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_F
mov r2, #0x70
str r2, [r1, #oGPIO_DAT]
#endif

mov pc, r10

@ clear memory
@ r0: start address
@ r1: length
mem_clear:
mov r2, #0
mov r3, r2
mov r4, r2
mov r5, r2
mov r6, r2
mov r7, r2
mov r8, r2
mov r9, r2

clear_loop:
stmia r0!, {r2-r9}
subs r1, r1, #(8 * 4)
bne clear_loop

mov pc, lr

#endif @ CONFIG_S3C2440_NAND_BOOT

文件最后添加：

#ifdef CONFIG_S3C2410_NAND_BOOT
.align 2
DW_STACK_START:
.word STACK_BASE+STACK_SIZE-4
#endif

7、编辑include/configs/fs2410.h文件

修改

#define CONFIG_COMMANDS \
     (CONFIG_CMD_DFL | \
      CFG_CMD_CACHE | \
      CFG_CMD_NAND | \
      /*CFG_CMD_EEPROM |*/ \
      /*CFG_CMD_I2C |*/ \
      /*CFG_CMD_USB |*/ \
      CFG_CMD_REGINFO | \
      CFG_CMD_DATE | \
      CFG_CMD_ELF)

//#define CFG_ENV_IS_IN_FLASH 1
//#define CFG_ENV_SIZE 0x10000

#define CFG_ENV_IS_IN_NAND 1
#define CFG_ENV_OFFSET 0x020000
#define CFG_NAND_BASE 0x4E000000
#define CMD_SAVEENV
#define CFG_NAND_LEGACY
#define CFG_ENV_SIZE 0x10000

文件最后的#endif之前增加如下代码：

#if (CONFIG_COMMANDS & CFG_CMD_NAND)

#define CONFIG_S3C2410_NAND_BOOT 1

#define CFG_MAX_NAND_DEVICE 1 /* Max number of NAND devices */
#define SECTORSIZE 512

#define ADDR_COLUMN 1
#define ADDR_PAGE 2
#define ADDR_COLUMN_PAGE 3

#define NAND_ChipID_UNKNOWN 0x00
#define NAND_MAX_FLOORS 1
#define NAND_MAX_CHIPS 1

#define NAND_WAIT_READY(nand) NF_WaitRB()

#define NAND_DISABLE_CE(nand) NF_SetCE(NFCE_HIGH)
#define NAND_ENABLE_CE(nand) NF_SetCE(NFCE_LOW)


#define WRITE_NAND_COMMAND(d, adr) NF_Cmd(d)
#define WRITE_NAND_COMMANDW(d, adr) NF_CmdW(d)
#define WRITE_NAND_ADDRESS(d, adr) NF_Addr(d)
#define WRITE_NAND(d, adr) NF_Write(d)
#define READ_NAND(adr) NF_Read()
/* the following functions are NOP's because S3C24X0 handles this in hardware */
#define NAND_CTL_CLRALE(nandptr)
#define NAND_CTL_SETALE(nandptr)
#define NAND_CTL_CLRCLE(nandptr)
#define NAND_CTL_SETCLE(nandptr)

#define CONFIG_MTD_NAND_VERIFY_WRITE 1
#define CONFIG_MTD_NAND_ECC_JFFS2 1



/*define NAND BOOT*/

#define UBOOT_RAM_BASE 0x33f80000
#define STACK_BASE 0x33f00000
#define STACK_SIZE 0x8000
#define NAND_CTL_BASE 0x4E000000
#define bINT_CTL(Nb) __REG(INT_CTL_BASE + (Nb))

#define oNFCONF 0x00
#define oNFCMD 0x04
#define oNFADDR 0x08
#define oNFDATA 0x0c
#define oNFSTAT 0x10
#define oNFECC 0x14

#endif


＃endif

8、确认存在以下文件：

drivers/nand_legacy/nand_legacy.c
include/linux/mtd/nand_ids.h
include/linux/mtd/nand.h

9、编辑include/linux/mtd/nand_ids.h文件

{"Samsung K9K1216Q0C", NAND_MFR_SAMSUNG, 0x46, 26, 0, 3, 0x4000, 1},
{"Samsung K9F1208U0M", NAND_MFR_SAMSUNG, 0xf6, 26, 0, 4, 0X4000, 0},
{ NULL,}

编译过程：

1、编辑Makefile 中的交叉编译环境

ifeq ($(ARCH),arm)
CROSS_COMPILE = ／usr/local/arm/2.95.3/bin/arm-linux-
endif

2、编译配置文件

make fs2410_config

3、编译u-boot

make all ARCH=ARM

4、u-boot根目录下编译完成的u-boot.bin文件可以下载到fs2410板的nandflash上。。