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OMAP-L138是否支持SDHC（SD2.0）？

novar luo
Prodigy 155 points
Other Parts Discussed in Thread: OMAP-L138

在datasheet和e2e论坛里面都有看到说OMAP-L138 V2.0版本的芯片可以支持SD2.0，也就是说可以支持>2G的卡，文档看了半天也没看明白！

如果支持的SDHC的话，请问寄存器设置和SD1.1有何不同？

我在自己的板子上试过小于2G的卡存取都是正常的，插上超过2G的看读写不正常。

有谁可以教我？

  • 0
    Prodigy 155 points

    已经解决了，物理层是支持的，改驱动就可以了，有兴趣的去看SDv2.0的手册

  • 0
    Prodigy 20 points

    楼主你好，我最近也在做omap138的sd卡驱动，有些问题想问你？能否留个qq我们方便联系啊，急急急，谢谢了！

  • 0 回复 novar luo
    Prodigy 20 points

    我的qq是2539844816，急急急！

  • 0 回复 amy tom
    Prodigy 20 points

    我现在也碰到这个问题，2G以下的卡都OK的，2G以上的卡读写就会出现IOerror错误。大侠，能不能给指点指点，谢谢

    mmcblk0: error -84 transferring data, sector 69120, nr 128, card status 0x900
    end_request: I/O error, dev mmcblk0, sector 69204
    Buffer I/O error on device mmcblk0, logical block 8650
    lost page write due to I/O error on mmcblk0
    end_request: I/O error, dev mmcblk0, sector 69208
    Buffer I/O error on device mmcblk0, logical block 8651
    lost page write due to I/O error on mmcblk0
    end_request: I/O error, dev mmcblk0, sector 69216
    Buffer I/O error on device mmcblk0, logical block 8652
    lost page write due to I/O error on mmcblk0
    end_request: I/O error, dev mmcblk0, sector 69224
    Buffer I/O error on device mmcblk0, logical block 8653
    lost page write due to I/O error on mmcblk0
    end_request: I/O error, dev mmcblk0, sector 69232
    Buffer I/O error on device mmcblk0, logical block 8654
    lost page write due to I/O error on mmcblk0
    end_request: I/O error, dev mmcblk0, sector 69240
    Buffer I/O error on device mmcblk0, logical block 8655
    lost page write due to I/O error on mmcblk0

  • 0 回复 shen javen
    Prodigy 11 points

    freescale提供的解决方法见https://community.freescale.com/thread/277327
    我的imx53的板子上是将linux-2.6.35.3\arch\arm\mach-mx5\mx53_loco.c中

    .max_clk = 50000000,改成.max_clk = 40000000,即：

    static struct mxc_mmc_platform_data mmc3_data = {
        .ocr_mask = MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30
            | MMC_VDD_31_32,
        .caps = MMC_CAP_4_BIT_DATA,
        //.caps = MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA,
        .min_clk = 400000,
        //.max_clk = 50000000,
        .max_clk = 40000000,
        .card_inserted_state = 1,
        .status = sdhc_get_card_det_status,
        .wp_status = 0, /*don't have pin, disable protect*///sdhc_write_protect,
        .clock_mmc = "esdhc_clk",
    };