UBOOT之DDR2内存移植相关修改简记 .

来源：互联网发布：剑网三男性捏脸数据编辑：程序博客网时间：2024/04/28 18:15

http://blog.csdn.net/evilcode/article/details/5958464

原文地址：http://blog.csdn.net/lightsoure/archive/2010/09/22/5900500.aspx

环境：S5PC100+android（UBOOT 1.3.4）

DDR2 256MB

由于DDR2相对于mobile ddR的低功耗优势，加上产品本身对功耗要求较高，所以需要使用DD2代替MOBILE DDR；

从/board/samsung/smdkc100下的UBOOT链表u-boot.LDS

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.text      :
{
cpu/s5pc1xx/start.o (.text)
cpu/s5pc1xx/s5pc100/cpu_init.o (.text)
board/samsung/smdkc100/lowlevel_init.o (.text)
         cpu/s5pc1xx/onenand_cp.o      (.text)
         cpu/s5pc1xx/nand_cp.o (.text)
         cpu/s5pc1xx/movi.o (.text)
*(.text)
}
可以知道UBOOT整个工作流程，很清晰。我们要做的应该是修改内存部分相关配置；

从START.S中

/*
* Go setup Memory and board specific bits prior to relocation.
*/

ldr sp, =0xd0036000 /* end of sram dedicated to u-boot */
sub sp, sp, #12 /* set stack */
mov fp, #0

bl lowlevel_init /* go setup pll,mux,memory */

以及lowlevel_init .S中

/* when we already run in ram, we don't need to relocate U-Boot.
* and actually, memory controller must be configured before U-Boot
* is running in ram.
*/
ldr r0, =0xff000fff
bic r1, pc, r0 /* r0 <- current base addr of code */
ldr r2, _TEXT_BASE /* r1 <- original base addr in ram */
bic r2, r2, r0 /* r0 <- current base addr of code */
cmp r1, r2 /* compare r0, r1 */
beq 1f /* r0 == r1 then skip sdram init */

/* init system clock */
bl system_clock_init

bl mem_ctrl_asm_init知道内存相关配置在CPU_INIT.S中，好吧，不罗嗦了。直接贴上配置：

step1:

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/************ DLL initialization *************/

       // ldr     r1, =0x6A101000               @ Phycontrol0 DLL parameter setting
ldr     r1, =0x50101008                         //added by S
        str     r1, [r0, #DMC_PHYCONTROL0]


//ldr     r1, =0x000000F4                         //added by S
ldr     r1, =0x000000F6                        //added by S the last bit is 6 for ddr21

        str     r1, [r0, #DMC_PHYCONTROL1]

      // ldr     r1, =0x00000000                            @Phycontrol2 DLL parameter setting
ldr     r1, =0x00000000                         //added by S
        str     r1, [r0, #DMC_PHYCONTROL2]

     // ldr     r1, =0x6A101002                      @DLL on
ldr     r1, =0x5010100a                         //added by S

        str     r1, [r0, #DMC_PHYCONTROL0]

      // ldr     r1, =0x6A101003               @Dll start
ldr     r1, =0x5010100b                         //added by S

        str     r1, [r0, #DMC_PHYCONTROL0]



    ldr r2, = 0xE6000040        @DMC_PHYSTATUS0

loop1:

    ldr r1, [r2]                @Check DLL lock
    ands    r1, r1, #4
    beq loop1

    ldr r1, [r2]
    mov r1, r1, LSR #(0x6)
    and r1, r1, #(0xff)
    mov r1, r1, LSL #(0x18)
        ldr     r2, = 0xE6000018           @DMC_PHYCONTROL0
    ldr r3, [r2]
    bic r3, r3, #(0xff000000)
    orr r1, r3, r2
    str r1, [r2]



       // ldr     r1, =0x6A101003           @Force Value locking
ldr     r1, =0x5010100b                         //added by S
        str     r1, [r0, #DMC_PHYCONTROL0]

       // ldr     r1, =0x6A101009           @Dll off
ldr     r1, =0x50101009                         //added by S
        str     r1, [r0, #DMC_PHYCONTROL0]

#if 0
        ldr     r1, =0x6A101000             @ Phycontrol0 DLL parameter setting
        str     r1, [r0, #DMC_PHYCONTROL0]

        ldr     r1, =0x00008484                             @Phycontrol1 DLL parameter setting
        str     r1, [r0, #DMC_PHYCONTROL1]

        ldr     r1, =0x00000000                             @Phycontrol2 DLL parameter setting
        str     r1, [r0, #DMC_PHYCONTROL2]

#endif
/************ DLL initialization - END *************/
step1中需要注意的是:对于DDR2，手册上说明PHYCONTROL1后最后3位为0X110；

step2:

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        //ldr     r1, =0x0FF01010                         @auto refresh off
ldr     r1, =0x0FF01010                    //added S

        str     r1, [r0, #DMC_CONCONTROL]


        //ldr     r1, =0x00102100
ldr     r1, =0x00212400                     //added by S

        str     r1, [r0, #DMC_MEMCONTROL]




ldr     r1, =0x20f00313                    //1CS 256MB0
       str     r1, [r0, #DMC_MEMCONFIG0]


ldr     r1, =0x40f00313                     //added by S

       str     r1, [r0, #DMC_MEMCONFIG1]


        ldr     r1, =0x20000000


        str     r1, [r0, #DMC_PRECHCONFIG]


    ldr     r1, =0x00100004         @ PwrdnConfig
        str     r1, [r0, #DMC_PWRDNCONFIG
step2中需要注意的是：对于DDR2 与S5PC100来说需要注意的是要与实际内存电路设计相关，我是32bit 两片内存并联，所以DDR2 对应一个CS为256MB，所以对于DMC_MEMCONFIG0来说chip_mask为f0;如果这里为f8则出现，UBOOT引导内核后，在内核的内存配置部分死掉等现象；

还有个部分：

对于这里的设置是否真的能影响功耗，这个还有待测试。

step3:

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/************ Timing Optimization *************/

/************ DDR2_166MHz *************///


// 7.8us*166MHz=0x50e
        ldr     r1, =0x0000050E

        str     r1, [r0, #DMC_TIMINGAREF]

ldr     r1, =0x16233288                           //added bu S
        str     r1, [r0, #DMC_TIMINGROW]



ldr     r1, =0x23250304                    @Timing Data   //added bu S
        str     r1, [r0, #DMC_TIMINGDATA]

ldr     r1, =0x06c80232                     @ Timing Power !!!!!!!!!!!!!!!
        str     r1, [r0, #DMC_TIMINGPOWER]
这部分是要根据你的内存时序来设置的，与其他BOOT内存时序配置类似.

step4:

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/* Direct Command for LPDDR - *///added by S 2010.9.16
/* chip0*/

    ldr     r1, =0x07000000                    @chip0 Deselect
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x01000000                        @chip0 PALL
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x00020000                        @ chip0 EMRS2
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x00030000                        @ chip0 EMRS3
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x00010400                       @ EMRS1 (MEM DLL on, DQS# disable)
        str     r1, [r0, #DMC_DIRECTCMD]


        ldr     r1, =0x00000552                        @ chip0 MRS (MEM DLL reset)
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x01000000                        @ chip0 chip0 PALL
        str     r1, [r0, #DMC_DIRECTCMD]

        ldr     r1, =0x05000000                       @ chip0 chip0 REFA
        str     r1, [r0, #DMC_DIRECTCMD]


        ldr     r1, =0x05000000                       @ chip0 chip0 REFA
        str     r1, [r0, #DMC_DIRECTCMD]


       ldr     r1, =0x00000452                       @ chip0 MRS (MEM DLL unreset), BL=4,CL=5
        str     r1, [r0, #DMC_DIRECTCMD]

       ldr     r1, =0x00010780                      @ chip0 EMRS1 (OCD default)
        str     r1, [r0, #DMC_DIRECTCMD]


      ldr     r1, =0x00010400                     @ chip0 EMRS1 (OCD exit)
        str     r1, [r0, #DMC_DIRECTCMD]
/* chip1*/
ldr r1, =0x07100000             @DirectCmd chip1 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00120000             @DirectCmd chip1 EMRS2
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00130000             @DirectCmd chip1 EMRS3
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110440             @DirectCmd chip1 EMRS1 (MEM DLL on, DQS# disable)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100552             @DirectCmd chip1 MRS (MEM DLL reset) CL=5, BL=4
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100452             @DirectCmd chip1 MRS (MEM DLL unreset)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110780             @DirectCmd chip1 EMRS1 (OCD default)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110400             @DirectCmd chip1 EMRS1 (OCD exit)
    str r1, [r0, #DMC_DIRECTCMD]
/***************************end**********************************
既然前面用到了两个片选则，对两个片选的配置。

step5： Start the DMC.

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// [ 5. Start the DMC.]//added by S


ldr     r1, =0x0FF020B0                       //change S @ConControl auto refresh on
        str     r1, [r0, #DMC_CONCONTROL]

#if 0
        ldr     r1, =0x001000FF         @ PwrdnConfig
        str     r1, [r0, #DMC_PWRDNCONFIG]
#endif




ldr     r1, =0x00212413                  //change S @ MemControl
        str     r1, [r0, #DMC_MEMCONTROL]

        b   exit_cpu_init
启动DMC

到这里这个流程基本结束了，因为没用ONENAND 所以着部分不用关注暂时

经过测试UBOOT能正常引导整个内核以及文件系统。

不过有个疑问：

我是8个BANKS，但是我选2个chips没有问题哦暂时，改成0X00貌似也一样。。这里有点晕忽~

留点疑问吧~等后面再侃侃~