Mango210 S5PV210 SD 부팅 가끔 안되는 문제 patch

http://cafe.naver.com/embeddedcrazyboys
http://www.mangoboard.com/

소스 수정 부분 

u-boot소스에서 

drivers/mmc/s3c_hsmmc.c 파일에서 아래 함수를 수정 했습니다. 

static void sdhci_change_clock(struct sdhci_host *host, uint clock)
{
    int div;
    u16 clk;
    unsigned long timeout;
    u32 ctrl2;

    /* Set SCLK_MMC from SYSCON as a clock source */
    ctrl2 = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
    ctrl2 &= ~(3 << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT);
    ctrl2 |= 2 << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
    writew(ctrl2, host->ioaddr + S3C_SDHCI_CONTROL2);

    writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);

    /* XXX: we assume that clock is between 40MHz and 50MHz */
    if (clock == 0)
        goto out;
    else if (clock <= 400000)
        div = 0x40;
    else if (clock <= 20000000)
        div = 2;
    else if (clock <= 26000000)
        div = 1;
    else

        div = 2;//crazyboys 131213 0 -> 2