首先，U-Boot1.2.0还没有支持s3c2440，这次移植是用2410的文件稍作修改而成的。其实2440和2410的区别主要是2440的主频更高，增加了摄像头接口和AC‘97音频接口；寄存器方面，除了新增模块的寄存器外，
0 在工作目录下解压U－Boot。
$tar zxvf u-boot.git.tar.gz
$vi Makefile
#为tekkaman2440建立编译项
sbc2410x_config: unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t sbc2410x NULL s3c24x0
tekkaman2440_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t tekkaman2440 tekkaman s3c24x0
各项的意思如下:
arm: CPU的架构(ARCH)
arm920t: CPU的类型(CPU)，其对应于cpu/arm920t子目录。
tekkaman2440: 开发板的型号(BOARD)，对应于board/tekkaman/tekkaman2440目录。
tekkaman: 开发者/或经销商(vender)。
s3c24x0: 片上系统(SOC)。
同时在“ifndef CROSS_COMPILE ”之前 加上自己交叉编译器的路径，比如我使用crosstool-0.43制作的基于2.6.22.2内核和gcc-4.1.0-glibc-2.3.2的 ARM9TDMI交叉编译器，则：
CROSS_COMPILE=/home/tekkaman/working/crosstool-gcc410-k26222/gcc-4.1.0-glibc-2.3.2/arm-9tdmi-linux-gnu/bin/arm-9tdmi-linux-gnu-
开发者/或经销商(vender)中填了 tekkaman ，所以开发板tekkaman2440目录一定要建在/board子目录中的tekkaman目录下 ，否则编译会出错。
$cd board
$mkdir tekkaman tekkaman/tekkaman2440
$cp -arf sbc2410x/* tekkaman/tekkaman2440/
$cd tekkaman/tekkaman2440
$mv sbc2410x.c tekkaman2440.c
还要记得修改自己的开发板tekkaman2440目录下的Makefile文件，不然编译时会出错：
COBJS := tekkaman2440.o flash.o
开发者/或经销商(vender)中填了 tekkaman ，所以开发板tekkaman2440目录一定要建在/board子目录中的tekkaman目录下 ，否则编译会出错。
$cd board
$mkdir tekkaman tekkaman/tekkaman2440
$cp -arf sbc2410x/* tekkaman/tekkaman2440/
$cd tekkaman/tekkaman2440
$mv sbc2410x.c tekkaman2440.c
还要记得修改自己的开发板tekkaman2440目录下的Makefile文件，不然编译时会出错：
COBJS := tekkaman2440.o flash.o
3 在include/configs/中建立配置头文件
$cd ../../..
$cp include/configs/sbc2410x.h include/configs/tekkaman2440.h
3 在include/configs/中建立配置头文件
$cd ../../..
$cp include/configs/sbc2410x.h include/configs/tekkaman2440.h
4 测试编译能否成功
$make tekkaman2440_config
Configuring for tekkaman2440 board...
(如果出现：
$ make tekkaman2440_config
Makefile:1927: *** 遗漏分隔符 。 停止。
请在U－boot的根目录下的Makefile的
@$(MKCONFIG) $(@:_config=) arm arm920t tekkaman2440 tekkaman
@$(MKCONFIG) $(@:_config=) arm arm920t tekkaman2440 tekkaman
二、修改U－Boot中的文件，以匹配友善之臂SBC2440V4 (0)修改寄存器地址定义
/* turn off the watchdog */
#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 */
#endif
(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]
# if defined(CONFIG_S3C2410)
ldr r1, =0x7ff //根据2410芯片手册，INTSUBMSK有11位可用，
//vivi也是0x7ff，不知为什么U－Boot一直没改过来。
ldr r0, =INTSUBMSK
str r1, [r0]
# endif
# 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
二、修改U－Boot中的文件，以匹配友善之臂SBC2440V4 (0)修改寄存器地址定义
/* turn off the watchdog */
#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 */
#endif
(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]
# if defined(CONFIG_S3C2410)
ldr r1, =0x7ff //根据2410芯片手册，INTSUBMSK有11位可用，
//vivi也是0x7ff，不知为什么U－Boot一直没改过来。
ldr r0, =INTSUBMSK
str r1, [r0]
# endif
# 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)修改时钟设置（2440的主频可达533MHz，但是我设到533MHz时系统很不稳定，不知是不是SDRAM和总线配置的影响，所以现在先设到 405MHz，以后在改进。）
/* FCLK:HCLK:PCLK = 1:4:8 */
ldr r0, =CLKDIVN
mrc p15, 0, r1, c1, c0, 0 /*read ctrl register tekkaman*/
orr r1, r1, #0xc0000000 /*Asynchronous tekkaman*/
mcr p15, 0, r1, c1, c0, 0 /*write ctrl register tekkaman*/
#if defined(CONFIG_S3C2440)
/*now, CPU clock is 405.00 Mhz tekkaman*/
mov r1, #CLK_CTL_BASE /* tekkaman*/
mov r2, #MDIV_405 /* mpll_405mhz tekkaman*/
add r2, r2, #PSDIV_405 /* mpll_405mhz tekkaman*/
str r2, [r1, #0x04] /* MPLLCON tekkaman */#endif
#if defined(CONFIG_S3C2410)
/*now, CPU clock is 202.8 Mhz tekkaman*/
mov r1, #CLK_CTL_BASE /* tekkaman*/
mov r2, #MDIV_200 /* mpll_200mhz tekkaman*/
add r2, r2, #PSDIV_200 /* mpll_200mhz tekkaman*/
str r2, [r1, #0x04] /* MPLLCON tekkaman */
#endif
#endif /* CONFIG_S3C2400 || CONFIG_S3C2410|| CONFIG_S3C2440利用vivi的代码，将其设为405.00MHz 并在前面加上：
#elif defined(CONFIG_S3C2410)
# define pWTCON 0x53000000
# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
# define INTSUBMSK 0x4A00001C
# define CLKDIVN 0x4C000014 /* clock divisor register */
#define CLK_CTL_BASE 0x4C000000 /* tekkaman */
#if defined(CONFIG_S3C2440)
#define MDIV_405 0x7f << 12 /* tekkaman */
#define PSDIV_405 0x21 /* tekkaman */
#endif
#if defined(CONFIG_S3C2410)
#define MDIV_200 0xa1 << 12 /* tekkaman */
#define PSDIV_200 0x31 /* tekkaman */
#endif
#endif
/* FCLK:HCLK:PCLK = 1:4:8 */
ldr r0, =CLKDIVN
mrc p15, 0, r1, c1, c0, 0 /*read ctrl register tekkaman*/
orr r1, r1, #0xc0000000 /*Asynchronous tekkaman*/
mcr p15, 0, r1, c1, c0, 0 /*write ctrl register tekkaman*/
#if defined(CONFIG_S3C2440)
/*now, CPU clock is 405.00 Mhz tekkaman*/
mov r1, #CLK_CTL_BASE /* tekkaman*/
mov r2, #MDIV_405 /* mpll_405mhz tekkaman*/
add r2, r2, #PSDIV_405 /* mpll_405mhz tekkaman*/
str r2, [r1, #0x04] /* MPLLCON tekkaman */#endif
#if defined(CONFIG_S3C2410)
/*now, CPU clock is 202.8 Mhz tekkaman*/
mov r1, #CLK_CTL_BASE /* tekkaman*/
mov r2, #MDIV_200 /* mpll_200mhz tekkaman*/
add r2, r2, #PSDIV_200 /* mpll_200mhz tekkaman*/
str r2, [r1, #0x04] /* MPLLCON tekkaman */
#endif
#endif /* CONFIG_S3C2400 || CONFIG_S3C2410|| CONFIG_S3C2440利用vivi的代码，将其设为405.00MHz 并在前面加上：
#elif defined(CONFIG_S3C2410)
# define pWTCON 0x53000000
# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
# define INTSUBMSK 0x4A00001C
# define CLKDIVN 0x4C000014 /* clock divisor register */
#define CLK_CTL_BASE 0x4C000000 /* tekkaman */
#if defined(CONFIG_S3C2440)
#define MDIV_405 0x7f << 12 /* tekkaman */
#define PSDIV_405 0x21 /* tekkaman */
#endif
#if defined(CONFIG_S3C2410)
#define MDIV_200 0xa1 << 12 /* tekkaman */
#define PSDIV_200 0x31 /* tekkaman */
#endif
#endif
(3)启动的代码。）
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 co
de */
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, #0x5//非）0x04 需要注意
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
之前加入：
@ LED1 on u-boot stage 1 is ok!
mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_B LED灯等IO初始化根据板子上来
ldr r2,=0x155aa
str r2, [r1, #oGPIO_CON]
mov r2, #0xff
str r2, [r1, #oGPIO_UP]
mov r2, #0x1c0
str r2, [r1, #oGPIO_DAT]
的第一阶段已完成！
后加入：
.align 2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-4
2 在board/tekkaman/tekkaman2440加入NAND Flash读函数文件，拷贝vivi中的nand_read.c文件到此文件夹即可：
#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;
}
3 修改board/tekkaman/tekkaman2440/Makefile文件
......
OBJS := tekkaman2440.o nand_read.o flash.o
......
4 修改include/configs/tekkaman2440.hs3c2410与s3c2440的Nand Flash
......
/*
* 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
/* GPIO */
#define GPIO_CTL_BASE 0x56000000
#define oGPIO_B 0x10
#define oGPIO_CON 0x0 /* R/W, Configures the pins of the port */
#define oGPIO_DAT 0x4 /* R/W, Data register for port */
#define oGPIO_UP 0x8 /* R/W, Pull-up disable register */
#endif /* __CONFIG_H */
5 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/tekkaman/tekkaman2440/lowlevel_init.S文件，我利用友善之臂提供的vivi源码里的信息做了如下更改:
......
/* 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
......
6 修改/board/tekkaman/tekkaman2440/tekkaman2440.c
因为友善之臂SBC2440和smdk2410的GPIO连接有所不同，修改其对GPIO和PLL的配置(请参阅友善之臂SBC2440的硬件说明和 2440芯片手册)：
#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;
......
/* 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();
gpio->GPBDAT = 0x180; //tekkamanninja
return 0;
}
7 为了实现NAND Flash的读写，再次修改请格外注意：如果编译时报错，在Linux下用KWrite等有高亮显示的文本编辑器看看文件的注释是不是为注释应有的颜色（KWrite中为灰色），如果不是,则将注释删除。因为#define后面的注释被认为是程序的一部分。建议注释和#define分行写)
......
/*
* High Level Configuration Options
* (easy to change)
*/
#define CONFIG_ARM920T 1 /* This is an ARM920T Core */
#define CONFIG_S3C2440 1 /* in a SAMSUNG S3C2440 SoC */
#define CONFIG_tekkaman2440 1 /* on a SAMSUNG tekkaman2440 Board */
......
/***********************************************************
* Command definition
***********************************************************/
#define CONFIG_COMMANDS \
(CONFIG_CMD_DFL | \
CFG_CMD_CACHE | \
CFG_CMD_NAND | \
CFG_CMD_NET | \
/*CFG_CMD_EEPROM |*/ \
/*CFG_CMD_I2C |*/ \
/*CFG_CMD_USB |*/ \
CFG_CMD_PING | \
CFG_CMD_ENV | \
CFG_CMD_REGINFO | \
CFG_CMD_DATE | \
CFG_CMD_DHCP | \
CFG_CMD_ELF)
/* this must be included AFTER the definition of CONFIG_COMMANDS (if any) */
#include
#define CFG_LONGHELP
/* undef to save memory */
#define CFG_PROMPT "[Tekkaman2440]#"
/*Monitor Command Prompt */
#define CFG_CBSIZE 256
/* Console I/O Buffer Size */
......
#define CFG_LOAD_ADDR 0x30008000
/* default load address */
......
/* Timeout for Flash Write */
#define CFG_ENV_IS_IN_NAND 1
#define CFG_ENV_OFFSET 0X20000
//#define ENV_IS_EMBEDDED 1
#define CFG_NAND_LEGACY
#define CFG_ENV_SIZE 0x10000
/* Total Size of Environment Sector */
/*----------------------------------------------------------------------
* NAND flash settings
*/
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
#define CFG_NAND_BASE 0x4E000000
/* NandFlash控制器在SFR区起始寄存器地址 支持的最在Nand Flash数据 页的大小 */
#define NAND_SECTOR_SIZE SECTORSIZE
#define NAND_BLOCK_MASK 511
/* 页掩码 一个字节的Column地址 */
字节的页块地址总共4字节的页块地址未知芯片的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<<0)));}
#define NAND_DISABLE_CE(nand) {rNFCONT |= (1<<1);}
#define NAND_ENABLE_CE(nand) {rNFCONT &= ~(1<<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 */
以上串口时钟需要重新配置，
第二部分修改如下：
（1）/include/common.h文件的第454行：
#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410) || defined(CONFIG_LH7A40X) || defined(CONFIG_S3C2440)
（2）/include/s3c24x0.h文件的第85、95、99、110、148、404行：
#if defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（3）/cpu/arm920t/s3c24x0/interrupts.c文件的第33行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第38行：#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（4）/cpu/arm920t/s3c24x0/serial.c文件的第22行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第26行：#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
void serial_setbrg (void)
{
S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
int i;
unsigned int reg = 0;
/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
reg = get_PCLK() / (16 * gd->baudrate) - 1;
/* FIFO enable, Tx/Rx FIFO clear */
uart->UFCON = 0x00;
uart->UMCON = 0x0;
/* Normal,No parity,1 stop,8 bit */
uart->ULCON = 0x3;
......
}
（5）/cpu/arm920t/s3c24x0/speed.c文件的第33行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第37行：#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
顺便修改源代码，以匹配s3c2440：
static ulong get_PLLCLK(int pllreg)
{
......
m = ((r & 0xFF000) >> 12) + 8;
p = ((r & 0x003F0) >> 4) + 2;
s = r & 0x3;
//tekkaman
#if defined(CONFIG_S3C2440)
if (pllreg == MPLL)
return((CONFIG_SYS_CLK_FREQ * m * 2) / (p << s));
else if (pllreg == UPLL)
#endif
//tekkaman
return((CONFIG_SYS_CLK_FREQ * m) / (p << s));
}
......
/* return FCLK frequency */
ulong get_FCLK(void)
{
return(get_PLLCLK(MPLL));
}
/* return HCLK frequency */
ulong get_HCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
if (clk_power->CLKDIVN & 0x6)
{
if ((clk_power->CLKDIVN & 0x6)==2) return(get_FCLK()/2);
if ((clk_power->CLKDIVN & 0x6)==6) return((clk_power->CAMDIVN & 0x100) ? get_FCLK()/6 : get_FCLK()/3);
if ((clk_power->CLKDIVN & 0x6)==4) return((clk_power->CAMDIVN & 0x200) ? get_FCLK()/8 : get_FCLK()/4);
return(get_FCLK());
}
else {
return(get_FCLK());
}
}
......
（6）/cpu/arm920t/s3c24x0/usb_ohci.c文件的第45行：
#elif defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440)
(i2c的文件还没修改，因为没用到)
（7）/rtc/s3c24x0_rtc.c文件的第35行：
#elif defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440)
在个文件中添加“defined(CONFIG_tekkaman2440)”，使得原来SBC2410X的代码可以编译进来。
（1）/cpu/arm920t/s3c24x0/interrupts.c文件的第181行：
defined(CONFIG_VCMA9) || defined(CONFIG_tekkaman2440)
9、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 KM29N16000",NAND_MFR_SAMSUNG, 0x64, 21, 1, 2, 0x1000, 0},
{"Samsung K9F1208U0B", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
{"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0x6b, 22, 0, 2, 0x2000, 0},
......
};
10、修改/lib_arm中的 board.c。
......
#include
#include
#include
#include
#include
#include
#include
......
static int display_banner (void)
{
S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
gpio->GPBDAT = 0x100; //tekkamanninja
//在串口初始化和console初始化完成，串口输出信息之前，LED1、LED2、LED3会亮起！
printf ("\n\n%s\n\n", version_string);
debug ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n",
_armboot_start, _bss_start, _bss_end);
printf ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n", //tekkaman
_armboot_start, _bss_start, _bss_end); //tekkaman
#ifdef CONFIG_MODEM_SUPPORT
debug ("Modem Support enabled\n");
#endif
#ifdef CONFIG_USE_IRQ
debug ("IRQ Stack: %08lx\n", IRQ_STACK_START);
debug ("FIQ Stack: %08lx\n", FIQ_STACK_START);
#endif
return (0);
}
......
void start_armboot (void)
{
init_fnc_t **init_fnc_ptr;
char *s;
#ifndef CFG_NO_FLASH
ulong size;
#endif
#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
unsigned long addr;
#endif
S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
......
gpio->GPBDAT = 0x0; //tekkamanninja
//在进入命令提示符之前，四个LED会同时亮起！
/* main_loop() can return to retry autoboot, if so just run it again. */
for (;;) {
main_loop ();
}
/* NOTREACHED - no way out of command loop except booting */
}
11、 修改common/env_nand.c
......
#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif
int nand_legacy_rw (struct nand_chip* nand, int cmd,
size_t start, size_t len,
size_t * retlen, u_char * buf);
extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];
extern int nand_legacy_erase(struct nand_chip *nand, size_t ofs, size_t len, int clean);
/* info for NAND chips, defined in drivers/nand/nand.c */
extern nand_info_t nand_info[CFG_MAX_NAND_DEVICE];
......
#else /* ! CFG_ENV_OFFSET_REDUND */
int saveenv(void)
{
ulong total;
int ret = 0;
puts ("Erasing Nand...");
//if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
if (nand_legacy_erase(nand_dev_desc + 0, CFG_ENV_OFFSET, CFG_ENV_SIZE, 0))
return 1;
puts ("Writing to Nand... ");
total = CFG_ENV_SIZE;
//ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
ret = nand_legacy_rw(nand_dev_desc + 0,
0x00 | 0x02, CFG_ENV_OFFSET, CFG_ENV_SIZE,
&total, (u_char*)env_ptr);
if (ret || total != CFG_ENV_SIZE)
return 1;
puts ("done\n");
return ret;
......
#else /* ! CFG_ENV_OFFSET_REDUND */
/*
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
*/
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
ulong total;
int ret;
total = CFG_ENV_SIZE;
//ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
ret = nand_legacy_rw(nand_dev_desc + 0, 0x01 | 0x02, CFG_ENV_OFFSET, CFG_ENV_SIZE, &total, (u_char*)env_ptr);
......
12、 在/board/tekkaman/tekkaman2440/tekkaman2440.c文件的末尾添加对Nand Flash 的初始化函数（在后面Nand Flash的操作都要用到）
u-boot运行至第二阶段进入start_armboot()函数。其中nand_init()函数是对nand flash的最初初始化函数。Nand_init()函数在两个文件中实现。其调用与CFG_NAND_LEGACY宏有关，如果没有定义这个宏，系统调用 drivers/nand/nand.c中的nand_init()；否则调用自己在board/tekkaman/tekkaman2440/tekkaman2440.c中的nand_init()函数。这里我选择第二种方式。
#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_Cont(u16 cont)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFCONT = cont;
}
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->NFCONT &= ~(1<<1);
break;
case NFCE_HIGH:
nand->NFCONT |= (1<<1);
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->NFCONT |= (1<<4);
}
static inline u32 NF_Read_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
return(nand->NFECC);
}
#endif
#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((TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4));
NF_Cont((1<<6)|(1<<4)|(1<<1)|(1<<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
12 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
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