topic How to enable UHS mode for SD card in u-boot_201304 in i.MX Processors

How to enable UHS mode for SD card in u-boot_201304

宗標廖 — Thu, 12 Mar 2015 07:45:52 GMT

Hello,

Community

I have a i.MX6Q custom board, and it supports switching to 1.8v for SDIO.

When I worked with u-boot_200908(LTIB version), I can enable the UHS mode

for SD card by setting port_supports_uhs18v filed of struct fsl_esdhc_cfg to 1.

But now I am working with u-boot_201304(Yocto Version), and in this version,

the struct fsl_esdhc_cfg does not have port_supports_uhs18v filed.So I donnot

know how to enable UHS mode for SD card in u-boot_201304.

Could you help me!

Best Regards,

ZongbiaoLiao

igorpadykov — Tue, 17 Mar 2015 13:49:45 GMT

Hi ZongbiaoLiao

in u-boot_201304 voltage change is handled using

host capabilities register (HC_HOSTCAPBLT_VS18, ESDHC_HOSTCAPBLT_VS30, fsl_esdhc.c)

Best regards

igor

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