From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jaehoon Chung <jh80.chung@samsung.com>
Date: Wed, 26 Aug 2015 15:23:31 +0900
Subject: [U-Boot] DWMMC crontroller in Exynos4412
In-Reply-To: <CAPnjgZ2Pe+ymnE9SiEv5A+Zgsir+pijUtNBAa4DcOOOsox7qgg@mail.gmail.com>
References: <55DCBD93.5050404@uclv.cu>
 <CAPnjgZ2Pe+ymnE9SiEv5A+Zgsir+pijUtNBAa4DcOOOsox7qgg@mail.gmail.com>
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On 08/26/2015 11:26 AM, Simon Glass wrote:
> +Samsung people
> 
> Hi,
> 
> On 25 August 2015 at 13:10, Humberto L?pez Le?n <humberto@uclv.cu> wrote:
>> Hi Simon,
>> I'm working on implementing a driver for SD/MMC cards in the framework
>> GenodeOS. I think you could help me with your experience in this type of
>> implementation in the u-boot.
>> The hardware platform on which the driver will work is a ODROID-x2
>> (exynos4412). I use the DWMMC contoller, but I'm not sure if this is the
>> right controller to handle SD/MMC cards in Exynos4412 SoC. The SDHCI
>> controller is most appropriate?

If you're using exynos4412 board, you can choose sdhci or dwmmc controller for eMMC, not SD/SDIO.
And in my experiment, dwmmc controller is more appropriate than sdhci.(ex, performance)

>>
>> Thank you for your help
> 
> I'm not really sure - the compatible string for that node is:
> 
> compatible = "samsung,exynos4412-dw-mshc";
> 
> which is different from what exynos5 uses.

As i know, Some register are difference..but i know it doesn't implemented for those registers at u-boot side.
If it should be implemented for upper mode than DDR50, it needs to check the compatible.

Best Regards,
Jaehoon Chung

> 
> Possibly Lukasz / Przemyslaw know about this.
> 
> Regards,
> Simon
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