给S5PV210裸机程序添加启动代码

(说明：本贴适用于tiny210v2且NandFlash型号为：K9GAG08U0F，其他暂不支持_不知道这算不算标题党:) )

友善提供了全套的210裸机代码的确很好，代码编写风格也是值得学习的。不过裸机代码是用不开源的Superboot引导的，这样学习裸机总有一种穿着棉裤洗澡的感觉，很不爽。还好了解了S5PV210的启动方式后，对于小于16k的裸机代码都可以将链接地址改为0xd0020010，sp指针设置到0xD0037D80，然后用mkv210_image.c将bin文件***成210.bin。再用Minitools下载u-boot的方式下载这个裸机程序。S5PV210的IROM中的BL0程序会从NandFlash拷贝代码到iram中的0xd0020000处，然后跳到0xd0020010处运行。裸机就可以跑起来了。

但是对于大于16k的代码，就不能完全靠IROM中BL0程序拷贝了。就要自己写一下BL1的启动代码了，自己拷贝。

经过《分析一下tiny210v2的16bitECC校验(已经实现u-boot for tiny210v2)》和《u-boot
for tiny210v2 (NandFlash:K9GAG08U0F)》其实“BL1”代码已经做好了,并且经过引导u-boot的验证的。下面就说说怎么添加到友善的裸机代码中，完全整个裸机代码的开源。下面以13.uart_stdio这个裸机代码添加“BL1”启动的过程说明一下。(烧写方式同上)

1.添加“BL1”目录(目录中包含了Makefile和mkv210_image.c)

2.添加nand_cp.c memory.S s5pv210.h

3.修改原工程的Makefile添加如下红色内容

CC = arm-linux-gcc

LD = arm-linux-ld

AR = arm-linux-ar

OBJCOPY = arm-linux-objcopy

OBJDUMP = arm-linux-objdump

CONFIG_SYS_TEXT_BASE :=0X20000000

COPY_BL2_SIZE :=0x80000

INCLUDEDIR := $(shell pwd)/include

CFLAGS :=-g -Wall -O2 -fno-builtin -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) \

-DCOPY_BL2_SIZE=$(COPY_BL2_SIZE)

CPPFLAGS :=-g -nostdinc -I$(INCLUDEDIR) -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) \

-DCOPY_BL2_SIZE=$(COPY_BL2_SIZE)

export CC AR LD OBJCOPY OBJDUMP INCLUDEDIR CFLAGS CPPFLAGS

objs := start.o memory.o nand_cp.o main.o uart.o clock.o lib/libc.a

all: stdio.bin

make -C ./BL1

cat ./BL1/BL1.bin stdio.bin > 210.bin

stdio.bin: $(objs)

${LD} -Ttext ${CONFIG_SYS_TEXT_BASE} -Tstdio.lds -o stdio.elf $^

${OBJCOPY} -O binary -S stdio.elf $@

${OBJDUMP} -D stdio.elf > stdio.dis

.PHONY : lib/libc.a

lib/libc.a:

cd lib; make; cd ..

%.o:%.c

${CC} $(CPPFLAGS) $(CFLAGS) -c -o $@ $<

%.o:%.S

${CC} $(CPPFLAGS) $(CFLAGS) -c -o $@ $<

clean:

make clean -C lib

make clean -C ./BL1/

rm -f *.bin *.elf *.dis *.o

4.保证工程目录已经实现uart.c 和 start.S,并在start.S中添加如下红色内容：

@******************************************************************************
@ File：start.S
@ 功能：启动代码，设置栈，拷贝代码到CONFIG_SYS_TEXT_BASE处
@******************************************************************************
.text
.global _start
_start:

/*
* set the cpu to SVC32 mode
*/
mrs r0, cpsr
bic r0, r0, #0x1f
orr r0, r0, #0xd3
msr cpsr,r0

/*
* Invalidate L1 I/D
*/
mov r0, #0 @ set up for MCR
mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs
mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array
mcr p15, 0, r0, c7, c10, 4 @ DSB
mcr p15, 0, r0, c7, c5, 4 @ ISB

/*
* disable MMU stuff and caches
*/
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00002000 @ clear bits 13 (--V-)
bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM)
orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align
orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB
bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache
mcr p15, 0, r0, c1, c0, 0

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
ldr r1, =_start @ _start的链接地址:CONFIG_SYS_TEXT_BASE
cmp r0, r1
beq run_on_dram @ 如果在是链接地址处，则直接运行

bl uart_init @ 初始化串口
bl nand_asm_init @ NandFlash初始化
bl mem_init @ dram初始化

bl board_init_f_nand @ 拷贝bl2代码到dram中，并运行

run_on_dram:
bl main @ 跳转

/* 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 (2<<23)|(7<<12)|(7<<8)|(7<<4)|(1<<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 NFCONF_VAL (0<<25)|(0x3<<23)|(7<<12)|(7<<8)|(7<<4)|(1<<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)|(1<<5)|(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

例子源代码：

http://arm9home.net/read.php?tid-80458.html

运行截图：



=============================================================================================================

13-06-26更新：

1.在start.S中添加了启动方式的判断，可以判断是从NandFlash启动还是SD卡启动：



//判断启动方式

#define PRO_ID_BASE 0xE0000000

#define PRO_ID_OFFSET 0x00

#define OMR_OFFSET 0x04

#define BOOT_ONENAND 0x1

#define BOOT_NAND 0x2

#define BOOT_MMCSD 0x3

#define BOOT_NOR 0x4

#define BOOT_SEC_DEV 0x5

#define INF_REG_BASE 0xE010F000

#define INF_REG3_OFFSET 0x0c

ldr r0, =PRO_ID_BASE

ldr r1, [r0,#OMR_OFFSET]

bic r2, r1, #0xffffffc1

/* NAND BOOT */

cmp r2, #0x0 @ 512B 4-cycle

moveq r3, #BOOT_NAND

cmp r2, #0x2 @ 2KB 5-cycle

moveq r3, #BOOT_NAND

cmp r2, #0x4 @ 4KB 5-cycle 8-bit ECC

moveq r3, #BOOT_NAND

cmp r2, #0x6 @ 4KB 5-cycle 16-bit ECC

moveq r3, #BOOT_NAND

cmp r2, #0x8 @ OneNAND Mux

moveq r3, #BOOT_ONENAND

/* SD/MMC BOOT */

cmp r2, #0xc

moveq r3, #BOOT_MMCSD

/* NOR BOOT */

cmp r2, #0x14

moveq r3, #BOOT_NOR

/* Uart BOOTONG failed */

cmp r2, #(0x1<<4)

moveq r3, #BOOT_SEC_DEV

ldr r0, =INF_REG_BASE

str r3, [r0, #INF_REG3_OFFSET]



ldr r1, [r0, #INF_REG3_OFFSET]

cmp r1, #BOOT_NAND /* 0x0 => boot device is nand */

beq nand_boot_210

cmp r1, #BOOT_MMCSD

beq mmcsd_boot_210



nand_boot_210:

mov r0, #'N'

bl putc

bl board_init_f_nand @ 拷贝bl2代码到dram中，并运行

mmcsd_boot_210:

mov r0, #'S'

bl putc

bl board_init_f_mmc

2.添加了mmc_cp.c其中有从SD卡copy到dram中的程序：

typedef unsigned int (*copy_sd_mmc_to_mem) (\

unsigned int channel, \

unsigned int start_block, \

unsigned short block_size, \

unsigned int *trg, \

unsigned int init);

void copy_code_to_dram(void)

{

unsigned long ch;

void (*BL2)(void);

ch = *(volatile unsigned int *)(0xD0037488);

unsigned char channel = 0;



putc('\n');putc('\r');

putc('B');putc('L');putc('1');putc(' ');putc('V');putc('e');putc('r');putc(':');

putc('1');putc('3');putc('0');putc('6');putc('2');putc('6');

putc('\n');putc('\r');

putc('S');putc('t');putc('a');putc('r');putc('t');putc(' ');putc('c');putc('p');putc(' ');

putc('\n');putc('\r');

// 函数指针

copy_sd_mmc_to_mem copy_bl2 = (copy_sd_mmc_to_mem) (*(unsigned int *) (0xD0037F98));

unsigned int ret;



// 通道0

if (ch == 0xEB000000)

channel = 0;

// 通道2

else if (ch == 0xEB200000)

channel = 2;



else

return;



// 0:channel 0

// 33:源,代码位于扇区33,1 sector = 512 bytes

// COPY_BL2_SIZE/512:长度，拷贝COPY_BL2_SIZE/512 sector，即COPY_BL2_SIZE K

// CONFIG_SYS_TEXT_BASE:目的,链接地址CONFIG_SYS_TEXT_BASE

ret = copy_bl2(channel, 33, COPY_BL2_SIZE/512,(unsigned int *)CONFIG_SYS_TEXT_BASE, 0);

putc('R');putc('u');putc('n');putc('n');putc('i');putc('n');putc('g');putc('!');putc(' ');

putc('\n');putc('\r');



// 跳转到DRAM

BL2 = (void *)CONFIG_SYS_TEXT_BASE;

(*BL2)();

}

void board_init_f_mmc()

{

copy_code_to_dram();

}

这个程序来自210的裸机中，红色的地方原来是unsigned char型的改为了unsigned short型的。

从NandFlash启动：




从SD卡启动：(SD卡烧写可以用dd命令或者用这个“SD-Flasher
for Linux v1.0（210版本）”)



这次的代码：

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