U-boot customization for customized board

[srinivasaporam]

Hi,

We have got customized board based on IMX6D. Now, we are bringing up the board for which we are customizing U-Boot and compiling it.

Now, for some of the freescale boards ccgr_init() is like below

static void ccgr_init(void)

{

    struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;

    writel(0xFFFFFFFF, &ccm->CCGR0);

    writel(0xFFFFFFFF, &ccm->CCGR1);

    writel(0xFFFFFFFF, &ccm->CCGR2);

    writel(0xFFFFFFFF, &ccm->CCGR3);

    writel(0xFFFFFFFF, &ccm->CCGR4);

    writel(0xFFFFFFFF, &ccm->CCGR5);

    writel(0xFFFFFFFF, &ccm->CCGR6);

    writel(0x00260324, &ccm->cbcmr);

}

where as some of the boards ccgr_init() function is defined as below:

static void ccgr_init(void)

{

    struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;

    writel(0x00C03F3F, &ccm->CCGR0);

    writel(0x0030FC03, &ccm->CCGR1);

    writel(0x0FFFC000, &ccm->CCGR2);

    writel(0x3FF00000, &ccm->CCGR3);

    writel(0x00FFF300, &ccm->CCGR4);

    writel(0x0F0000C3, &ccm->CCGR5);

    writel(0x000003FF, &ccm->CCGR6);

}

how to write ccgr_init() function for our board. how to arrive at those values.

also, i have another query on  mx6_ddr_sysinfo () (from imx_ddr.h)

struct mx6_ddr_sysinfo {

    u8 dsize;    /* size of bus (in dwords: 0=16bit,1=32bit,2=64bit) */

    u8 cs_density;    /* density per chip select (Gb) */

    u8 ncs;        /* number chip selects used (1|2) */

    char cs1_mirror;/* enable address mirror (0|1) */

    char bi_on;    /* Bank interleaving enable */

    u8 rtt_nom;    /* Rtt_Nom (DDR3_RTT_*) */

    u8 rtt_wr;    /* Rtt_Wr (DDR3_RTT_*) */

    u8 ralat;    /* Read Additional Latency (0-7) */

    u8 walat;    /* Write Additional Latency (0-3) */

    u8 mif3_mode;    /* Command prediction working mode */

    u8 rst_to_cke;    /* Time from SDE enable to CKE rise */

    u8 sde_to_rst;    /* Time from SDE enable until DDR reset# is high */

    u8 pd_fast_exit;/* enable precharge powerdown fast-exit */

    u8 ddr_type;    /* DDR type: DDR3(0) or LPDDR2(1) */

};

in this .cs-density value should be given as 2 if our DDR is 2Gb per chip select. But some places like Sabresd they are using 24, and some places they are using 20 etc.  how to get correct value.

[igorpadykov]

Hi Srinivasa

ccm->CCGRx define whch modules are used ("1" in CCGRx) in uboot, which

not. Description can be found in CCM chapter of RM.

Regarding mx6_ddr_sysinfo, one can look at presentation with

description MMDC settings

https://community.freescale.com/docs/DOC-104363

Best regards

igor

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