(6)lowlevel_init.S
#define B1_BWSCON (DW32) 修改为 #define B1_BWSCON (DW16)
#define B5_BWSCON (DW16) 修改为 #define B5_BWSCON (DW8)
#define REFCNT 1113 /* period=15.6us, HCLK=60Mhz, (2048+1-15.6*60) */
修改为
#define REFCNT 0x4f4/*period=7.8125us,HCLK=100Mhz, (2048+1-7.8125*100) */
二. 头文件修改 include/configs/tq2440.h
(1) cp include/configs/smdk2410.h include/configs/tq2440.h
(2) 增加宏定义:
#define CONFIG_DRIVER_DM9000 1
#define CONFIG_DM9000_BASE 0x20000300
#define DM9000_IO CONFIG_DM9000_BASE
#define DM9000_DATA (CONFIG_DM9000_BASE + 4)
#define CONFIG_DM9000_USE_16BIT
#define CONFIG_SETUP_MEMORY_TAGS 1
#define CONFIG_CMDLINE_TAG 1
(3)#define CONFIG_COMMANDS \中增加如下三项:
CFG_CMD_PING | \
CFG_CMD_JFFS2 | \
CFG_CMD_NAND | \
(4)修改网络相关参数:
#define CONFIG_BOOTDELAY 1
#define CONFIG_BOOTARGS "noinitrd root=/dev/mtdblock2 init=/linuxrc console=ttySAC0"
#define CONFIG_ETHADDR 0a:1b:2c:3d:4e:5f
#define CONFIG_NETMASK 255.255.255.0
#define CONFIG_IPADDR 192.168.1.6
#define CONFIG_SERVERIP 192.168.1.8
(5)#define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */
#if 0
#define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
#endif
修改为:
#if 0
#define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */
#endif
#define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
(6) 在最后#endif /* __CONFIG_H */前增加NAND相关宏定义:
#define CFG_NAND_BASE 0
#define CFG_MAX_NAND_DEVICE 1
#define NAND_MAX_CHIPS 1
三. 修改cpu/arm920t/start.S
(1) #elif defined(CONFIG_S3C2410)后添加:
# define INTMOD 0X4A000004
(2)将
/* FCLK:HCLK:PCLK = 1:2:4 */
/* default FCLK is 120 MHz ! */
ldr r0, =CLKDIVN
mov r1, #3
str r1, [r0]
修改为:
#if 0
/* FCLK:HCLK:PCLK = 1:2:4 */
/* default FCLK is 120 MHz ! */
ldr r0, =CLKDIVN
mov r1, #3
str r1, [r0]
#endif
(3) 在
bl cpu_init_crit
#endif后面加上
/* Set up the stack */
stack_setup:
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
sub sp, r0, #12 /* leave 3 words for abort-stack */
bl clock_init
(4) 将下列代码替换
#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 */
/* Set up the stack */
stack_setup:
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) |
详细的bootloader的移植(4)
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