全部博文（185）
分类： LINUX
2009-03-25 12:01:14
一，准备工作
1 进入U-Boot目录，修改Makefile
smdk2410_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t smdk2410 NULL s3c24x0
新建
qq2440_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t qq2440 NULL s3c24x0
2.在board文件夹下创建开发板qq2440目录
$cp -arf smdk2410/* qq2440/
$cd qq2440
$mv smdk2410.c qq2440.c
修改makefile
3. 在include/configs/中建立配置头文件
$cp include/configs/smdk2410.h include/configs/qq2440.h
二，修改文件内容，适应QQ2440开发板
根据代码执行顺序
1 修改/cpu/arm920t/start.S
(1)修改中断禁止部分
#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440)
ldr r0, =pWTCON
mov r1, #0x0
str r1, [r0]
/*
* mask all IRQs by setting all bits in the INTMR - default
*/
mov r1, #0xffffffff
ldr r0, =INTMSK
str r1, [r0]
//添加或者直接替换s3c2410的
# if defined(CONFIG_S3C2440)
ldr r1, =0x7fff //根据2440芯片手册，INTSUBMSK有15位可用
ldr r0, =INTSUBMSK
str r1, [r0]
# endif
（2）时钟设置
# if defined(CONFIG_S3C2400)
# define pWTCON 0x15300000
# define INTMSK 0x14400008 /* Interupt-Controller base addresses */
# define CLKDIVN 0x14800014 /* clock divisor register */
#elif defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440)
# define pWTCON 0x53000000
# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
# define INTSUBMSK 0x4A00001C
# define CLKDIVN 0x4C000014 /* clock divisor register */
/* 配置主频405M */
#define CLK_CTL_BASE 0x4C000000 /* clock */
#if defined(CONFIG_S3C2440)
#define MDIV_405 0x7f << 12 /* 405M */
#define PSDIV_405 0x21 /* */
#endif
# endif
/*FCLK:HCLK:PCLK = 1:4:8 */
ldr r0, =CLKDIVN
mov r1, #5
str r1, [r0]
mrc p15, 0, r1, c1, c0, 0 @ read ctrl register
orr r1, r1, #0xc0000000 @ Asynchronous
mcr p15, 0, r1, c1, c0, 0 @ write ctrl register
#if defined(CONFIG_S3C2440)
/*now, CPU clock is 405.00 Mhz */
mov r1, #CLK_CTL_BASE
mov r2, #MDIV_405
add r2, r2, #PSDIV_405
str r2, [r1, #0x04]
#endif
#endif /* CONFIG_S3C2400 || CONFIG_S3C2410 || CONFIG_S3C2440*/
(3)将从Flash启动改成从NAND Flash启动
将以下U－Boot的重定向语句段：
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate: /* relocate U-Boot to RAM */
adr r0, _start /* r0 <- current position of code */
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq stack_setup
ldr r2, _armboot_start
ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
add r2, r0, r2 /* r2 <- source end address */
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
替换成：
#ifdef CONFIG_S3C2440_NAND_BOOT @tekkaman@@@@@@@@@@@@@@@@SSSSSSSSSSSSS
@ 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
nand1:
add r3, r3, #0x1
cmp r3, #0xa
blt nand1
nand2:
ldr r2, [r1, #oNFSTAT] @ wait ready
tst r2, #0x4
beq nand2
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
@ copy U-Boot to RAM
ldr r0, =TEXT_BASE
mov r1, #0x0
mov r2, #0x20000
bl nand_read_ll
tst r0, #0x0
beq ok_nand_read
bad_nand_read:
loop2: b loop2 @ infinite loop
ok_nand_read:
@ verify
mov r0, #0
ldr r1, =TEXT_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 stack_setup
bne go_next
notmatch:
loop3: b loop3 @ infinite loop
#endif @ CONFIG_S3C2440_NAND_BOOT @tekkaman@@@@@@@@@@@@@@@@@@EEEEEEEEE
在 “ _start_armboot: .word start_armboot ” 后加入：
.align 2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-4
2.在board/qq2440/添加nand_read.c文件
在启动时，将uboot从nandflash拷贝到RAM执行的读取函数
#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;
}
修改相关makefile
3.修改include/configs/qq2440.h
/*
* Nandflash Boot
*/
#define CONFIG_S3C2440_NAND_BOOT 1
#define STACK_BASE 0x33f00000
#define STACK_SIZE 0x8000
//#define UBOOT_RAM_BASE 0x33f80000
/* NAND Flash Controller */
#define NAND_CTL_BASE 0x4E000000
#define bINT_CTL(Nb) __REG(INT_CTL_BASE + (Nb))
/* Offset */
#define oNFCONF 0x00
#define oNFCONT 0x04
#define oNFCMD 0x08
#define oNFADDR 0x0c
#define oNFDATA 0x10
#define oNFSTAT 0x20
#define oNFECC 0x2c
4. 修改board/tekkaman/tekkaman2440/lowlevel_init.S文件
依照开发板的内存区的配置情况, 修改board/qq2440/lowlevel_init.S文件，一般仿smdk2440的配置
......
/* REFRESH parameter */
#define REFEN 0x1 /* Refresh enable */
#define TREFMD 0x0 /* CBR(CAS before RAS)/Auto refresh */
#define Trp 0x2 /* 4clk */
#define Trc 0x3 /* 7clk */
#define Tchr 0x2 /* 3clk */
#define REFCNT 1012
5 修改/board/qq2440/qq2440.c
......
#elif FCLK_SPEED==1 /* Fout = 405MHz */
//#define M_MDIV 0x5c
//#define M_PDIV 0x4
//#define M_SDIV 0x0
#define M_MDIV 0x7f
#define M_PDIV 0x2
#define M_SDIV 0x1
......
#elif USB_CLOCK==1
//#define U_M_MDIV 0x48
//#define U_M_PDIV 0x3
#define U_M_MDIV 0x38
#define U_M_PDIV 0x2
#define U_M_SDIV 0x2
......
/* set up the I/O ports */
gpio->GPACON = 0x007FFFFF;
//gpio->GPBCON = 0x00044556;
gpio->GPBCON = 0x00055556;//gpb5，6，7，8为4个led输出
......
/* arch number of S3C2440 -Board */
gd->bd->bi_arch_number = MACH_TYPE_S3C2440 ;
/* adress of boot parameters */
gd->bd->bi_boot_params = 0x30000100;
icache_enable();
dcache_enable();
return 0;
}
（1）/include/common.h
（2）/include/s3c24x0.h
（3）/cpu/arm920t/s3c24x0/interrupts.c
在get_tbclk (void)添加 defined(CONFIG_VCMA9) || defined(CONFIG_S3C2440)
（4）/cpu/arm920t/s3c24x0/serial.c；由于主频变化，这里波特率设置需要重新计算
（5）/cpu/arm920t/s3c24x0/speed.c；根据原来2410的代码，修改匹配2440
（1）/cpu/arm920t/s3c24x0/interrupts.c
8、在 include/linux/mtd/nand_ids.h的结构体nand_flash_ids加入
static struct nand_flash_dev nand_flash_ids[] = {
......
{"Samsung K9F1208U0B", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
......
};
9. board.c添加
#include
10 在/include/s3c24x0.h中加入2440 的NAND FLASH 寄存器定义和CAMDIVN定义：
......
typedef struct {
S3C24X0_REG32 LOCKTIME;
S3C24X0_REG32 MPLLCON;
S3C24X0_REG32 UPLLCON;
S3C24X0_REG32 CLKCON;
S3C24X0_REG32 CLKSLOW;
S3C24X0_REG32 CLKDIVN;
S3C24X0_REG32 CAMDIVN;
} /*__attribute__((__packed__))*/ S3C24X0_CLOCK_POWER;
......
#if defined(CONFIG_S3C2410)
/* NAND FLASH (see S3C2410 manual chapter 6) */
typedef struct {
S3C24X0_REG32 NFCONF;
S3C24X0_REG32 NFCMD;
S3C24X0_REG32 NFADDR;
S3C24X0_REG32 NFDATA;
S3C24X0_REG32 NFSTAT;
S3C24X0_REG32 NFECC;
} /*__attribute__((__packed__))*/ S3C2410_NAND;
#endif
#if defined (CONFIG_S3C2440)
/* NAND FLASH (see S3C2440 manual chapter 6) */
typedef struct {
S3C24X0_REG32 NFCONF;
S3C24X0_REG32 NFCONT;
S3C24X0_REG32 NFCMD;
S3C24X0_REG32 NFADDR;
S3C24X0_REG32 NFDATA;
S3C24X0_REG32 NFMECC0;
S3C24X0_REG32 NFMECC1;
S3C24X0_REG32 NFSECC;
S3C24X0_REG32 NFSTAT;
S3C24X0_REG32 NFESTAT0;
S3C24X0_REG32 NFESTAT1;
S3C24X0_REG32 NFECC;
} /*__attribute__((__packed__))*/ S3C2410_NAND;
#endif
在U－Boot的根目录下生成uboot.bin下载到开发板
U-Boot 1.3.2 (Aug 31 2008 - 18:36:25)
U-Boot code: 33f80000 -> 33f9f328; BSS: -> 33fa4608
DRAM: 64 MB
Flash: 1 MB
NAND: 64 MiB
*** Warning - bad CRC or NAND, using default environment
In: serial
Out: serial
Err: serial
QQ2440 >
注意uboot1.3.2在命令配置上与以前版本的不同；1.3.2 以前是CFG开头，如ping命令（看cmd_net.c）以前是#if (CONFIG_COMMANDS & CFG_CMD_PING)；而1.3.2版是#if defined(CONFIG_CMD_PING)；就是在include/configs/board.h直接定义CONFIG_CMD_PING就可 以了
