移植u-boot 1.1.6到TQ2440開發(fā)板-第二階段

移植u-boot 1.1.6到TQ2440開發(fā)板-第二階段

增加uboot對(duì)TQ2440的代碼支持

第一步：修改 SDRAM 配置，修改u-boot-1.1.6/board/TQ2440目錄lowlevel_init.S文件

第54行

#define B1_BWSCON(DW16)
#define B2_BWSCON(DW16)
#define B3_BWSCON(DW16 + WAIT + UBLB)
#define B4_BWSCON(DW16)
#define B5_BWSCON(DW8)
#define B6_BWSCON(DW32)
#define B7_BWSCON(DW32)

第126行

#define REFCNT4F4

第二步：時(shí)鐘設(shè)置，S3c2440 的時(shí)鐘計(jì)算公式和 s3c2410 不一樣，對(duì)于 s3c2440 開發(fā)板，將 PCLK 設(shè)為
400Mhz ，分頻比為 FCLK:HCLK:PCLK=1:4:8，有2種設(shè)定方法，我們使用簡(jiǎn)單的一種。

1、首先屏蔽原來 s3c2410 的時(shí)鐘設(shè)置，修改 u-boot-1.1.6/cpu/arm920t/ 目錄下 start.S 文件 148 行如下：

#if 0


ldrr0, =CLKDIVN
movr1, #3
strr1, [r0]
#endif

2、修改 u-boot-1.1.6/cpu/arm920t/start.S ，將 stack_setup子程序搬到 relocate 子程序之前，因?yàn)樗{(diào)用的 clock_init 函數(shù)需要用到堆棧。

stack_setup:
ldrr0, _TEXT_BASE
subr0, r0, #CFG_MALLOC_LEN
subr0, r0, #CFG_GBL_DATA_SIZE
#ifdef CONFIG_USE_IRQ
subr0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
subsp, r0, #12

blclock_init

#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate:
adrr0, _start
ldrr1, _TEXT_BASE
cmpr0, r1
beqclear_bss

ldrr2, _armboot_start
ldrr3, _bss_start
subr2, r3, r2
addr2, r0, r2
3、編寫clock_init函數(shù)，board/TQ2440 目錄下建議一個(gè)名為 boot_init.c 的文件，編寫 colck_init 函數(shù)，同時(shí)加上一些聲明和延時(shí)子函數(shù)

#include
#include
#define GSTATUS1(*(volatile unsigned int *)0x560000B0)
static inline void delay (unsigned long loops)
{
__asm__ volatile ("1: n"
"subs %0, %1, #1 n"
"bne 1b":"=r" (loops):"0" (loops));
}

#define S3C2440_MPLL_400MHZ((0x5c<<12)| (0x01<<4)|(0x01))
#define S3C2440_MPLL_200MHZ ((0x5c<<12)|(0x01<<4)|(0x02))
#define S3C2440_MPLL_100MHZ ((0x5c<<12)|(0x01<<4)|(0x03))
#define S3C2440_UPLL_96MHZ ((0x38<<12)|(0x02<<4)|(0x01))
#define S3C2440_UPLL_48MHZ ((0x38<<12)|(0x02<<4)|(0x02))
#define S3C2440_CLKDIV (0x05) // | (1<<3))
#define S3C2440_CLKDIV188 0x04
#define S3C2440_CAMDIVN188 ((0<<8)|(1<<9))

#define S3C2410_MPLL_200MHZ((0x5c<<12)|(0x04<<4)|(0x00))
#define S3C2410_UPLL_48MHZ ((0x28<<12)|(0x01<<4)|(0x02))
#define S3C2410_CLKDIV 0x03
void clock_init(void)
{
S3C24X0_CLOCK_POWER *clk_power = (S3C24X0_CLOCK_POWER *)0x4C000000;

if ((GSTATUS1 == 0x32410000)|| (GSTATUS1 == 0x32410002))
{

clk_power- >CLKDIVN = S3C2410_CLKDIV;

__asm__("mrcp15, 0, r1, c1, c0, 0 n"
"orr r1,r1, #0xc0000000 n"
11
"mcr p15, 0, r1, c1, c0, 0 n"
:::"r1"
);

clk_power- >LOCKTIME = 0xFFFFFFFF;

clk_power- >UPLLCON = S3C2410_UPLL_48MHZ;

delay (4000);

clk_power- >MPLLCON = S3C2410_MPLL_200MHZ;

delay (8000);
}
else
{

clk_power- >CLKDIVN = S3C2440_CLKDIV;

__asm__("mrcp15, 0, r1, c1, c0, 0 n"
"orr r1,r1, #0xc0000000 n"
"mcr p15, 0, r1, c1, c0, 0 n"
:::"r1"
);

clk_power- >LOCKTIME = 0xFFFFFFFF;

clk_power- >UPLLCON = S3C2440_UPLL_48MHZ;

delay (4000);

clk_power- >MPLLCON = S3C2440_MPLL_400MHZ;

delay (8000);
}
}

4、修改u-boot-1.1.6/board/TQ2440/TQ2440.c 文件中的 board_init 函數(shù)

int board_init (void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

gpio- >GPACON = 0x007FFFFF;
gpio- >GPBCON = 0x00055555;
gpio- >GPBUP = 0x000007FF;
gpio- >GPCCON = 0xAAAAAAAA;
gpio- >GPCUP = 0x0000FFFF;
gpio- >GPDCON = 0xAAAAAAAA;
gpio- >GPDUP = 0x0000FFFF;
gpio- >GPECON = 0xAAAAAAAA;
gpio- >GPEUP = 0x0000FFFF;
gpio- >GPFCON = 0x000055AA;
gpio- >GPFUP = 0x000000FF;
gpio- >GPGCON = 0xFF94FFBA;
gpio- >GPGUP = 0x0000FFEF;
gpio- >GPGDAT = gpio- >GPGDAT & (~(1<<4)) | (1<<4);
gpio- >GPHCON = 0x002AFAAA;
gpio- >GPHUP = 0x000007FF;

if ((gpio- >GSTATUS1 == 0x32410000) || (gpio- >GSTATUS1 == 0x32410002))
{

gd- >bd- >bi_arch_number = MACH_TYPE_SMDK2410;
}
else
{

gd- >bd- >bi_arch_number = MACH_TYPE_S3C2440;
}

gd- >bd- >bi_boot_params = 0x30000100;
icache_enable();
dcache_enable();
return 0;
}

5、修改u-boot-1.1.6/board/TQ2440的Makefile

COBJS:= TQ2440.o flash.oboot_init.o
并在 board/dong2440/u - boot.lds 文件中 35 行添加如下內(nèi)容：
.text:
{
cpu/arm920t/start.o(.text)
board/TQ2440/boot_init.o(.text)
*(.text)
}
以增加對(duì) boot_init.o 的連接。
其它inclu de/s3c24x0.h ，cpu/arm920t/s3c24x0/speed.c的修改同上面的方法一樣。

第三步：make

最后 make 一下，沒有錯(cuò)誤，加載到內(nèi)存中運(yùn)行正常。我的運(yùn)行結(jié)果如下：
U- Boot 1.1.6 (Sep 4 2010- 13:50:20)
DRAM: 64 MB
Flash: 512 kB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
SMDK2410 # ?
?- alias for help
autoscr - run script from m emory
base- print or set address offset
u - boot 中的提示符“ SMDK2410 #” 可以在/include/configs/dong2440.h 中修改成自己喜歡的
提示符，操作如下：#defineCFG_PROMPT"[dong2440]# "