参考tekkman的uboot移植文章,讲解的非常详细;按照这个步骤修改,基本没出现什么大错;
感谢tekkman的共享!
http://blog.chinaunix.net/u1/34474/article_62956.html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
/*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 替换成:
#ifdef CONFIG_S3C2440_NAND_BOOT @tekkaman@@@@@@@@@@@@@@@@SSSSSSSSSSSSS
@ reset NAND
mov r1, #NAND_CTL_BASE
ldr r2, =( (7
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> 9) & 0xff;
NFADDR = (i >> 17) & 0xff;
NFADDR = (i >> 25) & 0xff;
NAND_DETECT_RB;
for(j=0; j /*
* 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;
}
6 NAND Flash的读写需要的配置
/* * NAND flash settings* */
#if CONFIG_CMD_NAND // (CONFIG_COMMANDS & CFG_CMD_NAND)
#define CFG_NAND_BASE 0x4E000000 /* NandFlash控制器在SFR区起始寄存器地址 */
#define CFG_MAX_NAND_DEVICE 1 /* 支持的最在Nand Flash数据 */
#define SECTORSIZE 512 /* 1页的大小 */
#define NAND_SECTOR_SIZE SECTORSIZE
#define NAND_BLOCK_MASK 511/* 页掩码 */
#define ADDR_COLUMN 1 /* 一个字节的Column地址 */
#define ADDR_PAGE 3 /* 3字节的页块地址!!!!!*/
#define ADDR_COLUMN_PAGE 4 /* 总共4字节的页块地址!!!!! */
#define NAND_ChipID_UNKNOWN 0x00 /* 未知芯片的ID号 */
#define NAND_MAX_FLOORS 1
#define NAND_MAX_CHIPS 1
/* Nand Flash命令层底层接口函数 */
#define WRITE_NAND_COMMAND(d, adr) {rNFCMD = d;}
#define WRITE_NAND_ADDRESS(d, adr) {rNFADDR = d;}
#define WRITE_NAND(d, adr) {rNFDATA = d;}
#define READ_NAND(adr) (rNFDATA)
#define NAND_WAIT_READY(nand) {while(!(rNFSTAT&(1
#define WRITE_NAND_COMMANDW(d, adr) NF_CmdW(d)
/* 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)
/* 允许Nand Flash写校验 */
#define CONFIG_MTD_NAND_VERIFY_WRITE 1
#define rNFCONF (*(volatile unsigned int *)0x4e000000)
#define rNFCONT (*(volatile unsigned int *)0x4e000004)
#define rNFCMD (*(volatile unsigned char *)0x4e000008)
#define rNFADDR (*(volatile unsigned char *)0x4e00000c)
#define rNFDATA (*(volatile unsigned char *)0x4e000010)
#define rNFSTAT (*(volatile unsigned int *)0x4e000020)
#define rNFECC (*(volatile unsigned int *)0x4e00002c)
#endif /* __CONFIG_H */
7、在多个文件中添加“CONFIG_S3C2440”,使得原来s3c2410的代码可以编译进来。
(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
三、交叉编译U-Boot。
在U-Boot的根目录下生成uboot.bin下载到开发板
运行,出现如下结果,uboot移植基本成功;在打印nand:64MiB时有点慢。
在qq2440.h文件没有定义CFG_NAND_LEGACY,系统调用的drivers/mtd/nand/nand.c中的nand_init();
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
网络可以用,host开启tftp服务器,在uboot用命令tftp可以下载内核映象
本文来自ChinaUnix博客,如果查看原文请点:
http://blog.chinaunix.net/u2/76444/showart_1160823.html