S5PV210 构建最小linux系统（1）---->搬运代码到ram中运行

最新推荐文章于 2023-10-18 20:58:06 发布

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最新推荐文章于 2023-10-18 20:58:06 发布

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分类专栏： S5PV210 文章标签： linux S5PV210

本文链接：https://blog.youkuaiyun.com/qq_15506653/article/details/78476797

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S5PV210 构建最小linux系统（1）—->搬运代码到ram中运行

1.时钟初始化

S5PV210手册时钟树

通过时钟树对相应的寄存器进行配置，得到期望时钟。

//set clock
    ldr r0, =CLK_BASE
    ldr r1, =0x0
    str r1, [r0, #CLK_SRC0]
//set SCLKapll=1000M    
    ldr r1, =(1<<31)|(125<<16)|(3<<8)|1
    str r1, [r0, #APLL_CON0]
//set SCLKmpll=667M
    ldr r1, =(1<<31)|(667<<16)|(12<<8)|1
    str r1, [r0, #MPLL_CON]
    ldr r1, =(1<<28)|(4<<24)|(1<<20)|(3<<16)|(1<<12)|(4<<8)|(4<<4)|0
    str r1, [r0, #CLK_DIV0]
    ldr r1, =(1<<4)|1
    str r1, [r0, #CLK_SRC0]

2.DRAM初始化

DDR2初始化步骤1
DDR2初始化步骤2

依照手册初始化步骤进行ram初始化

//2
    ldr r0, =DMC0_BASE
    ldr r1, =(0x10<<16)|(0x10<<8)|(1<<1)
    str r1, [r0, #PHYCONTROL0]
//3
    ldr r1, =(8<<4)|6
    str r1, [r0, #PHYCONTROL1]
//4
    ldr r1, =(0x10<<16)|(0x10<<8)|(1<<1)|1
    str r1, [r0, #PHYCONTROL0]
//5 
    ldr r1, =0x0FFF2010
    str r1, [r0, #CONCONTROL]
//6 
    ldr r1, =0x00202400
    str r1, [r0, #MEMCONTROL]
//7
    ldr r1, =0x20E00313
    str r1, [r0, #MEMCONFIG0]
//8
    ldr r1, =0xFF000000
    str r1, [r0, #PRECHCONFIG]
//9
    ldr r1, =0x00000618
    str r1, [r0, #TIMINGAREF]

    ldr r1, =0x2B34438A
    str r1, [r0, #TIMINGROW]

    ldr r1, =0x24240000
    str r1, [r0, #TIMINGDATA]

    ldr r1, =0x0BDC0343
    str r1, [r0, #TIMINGPOWER]
//11
wait_lock:
    ldr r1, [r0, #PHYSTATUS]
    and r2, r1, #0x07
    cmp r2, #0x07
    bne wait_lock
//12    
    and r1, #0x3fc0
    mov r1, r1, LSL #18
    ldr r2, =(0x10<<16)|(0x10<<8)|(1<<1)|1
    orr r1, r2, r1
    str r1, [r0, #PHYCONTROL0]

    ldr r1, =0x07000000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x01000000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00020000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00030000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00010400             
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00000542                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x01000000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x05000000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x05000000                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00000442                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00010780                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x00010400                 
    str r1, [r0, #DIRECTCMD]

    ldr r1, =0x0FF02030                 
    str r1, [r0, #CONCONTROL]

    ldr r1, =0xFFFF00FF                 
    str r1, [r0, #PWRDNCONFIG]

    ldr r1, =0x00202400         
    str r1, [r0, #MEMCONTROL]
// dram end
//跳转到代码搬运函数
    b   copy_code_to_dram

3.代码搬运（SD->RAM）

IROM 中的拷贝函数

代码搬运函数

typedef unsigned int (*CopySDMMCtoMem) (unsigned int  channel, unsigned int  start_block, unsigned short block_size, unsigned int  *trg, unsigned int  init);

void copy_code_to_dram(void)
{
    unsigned long ch;
    void (*uboot)(void);
    ch = *(volatile unsigned int *)(0xD0037488);

    CopySDMMCtoMem copy_data = (CopySDMMCtoMem) (*(unsigned int *) (0xD0037F98));

    unsigned int ret;
    led2_on();  
    if (ch == 0xEB000000)
    {
        ret = copy_data(0, 6, 1000,(unsigned int *)0x20000000, 0);  //Uboot
        ret = copy_data(0, 1006, 100,(unsigned int *)0x200C8000, 0);    //Dtb
        ret = copy_data(0, 1106, 20000,(unsigned int *)0x20100000, 0);  //linux kernel
    }
    uboot = (void *)0x20000000;
    (*uboot)(); //跳转到uboot执行
}