anyone got a working sdhci interface on any MT7620 based router boards?
I have a board that contains MT7620A and I have built openwrt from chaos calmer branch of Openwrt buildroot.
Everything works fine except for the SD card interface.that board came with official Ralink firmware where the SD interface was working so it shouldnt be a hardware issue.
I have tried different approaches from adding pinctrl information in dts file to adding and removing kernel modules but nothing works.dmesg output

[    8.410000] mtk-sd: MediaTek MT6575 MSDC Driver
[    8.420000] sdhci: Secure Digital Host Controller Interface driver
[    8.420000] sdhci: Copyright(c) Pierre Ossman
[    8.430000] sdhci-pltfm: SDHCI platform and OF driver helper

but thats all.When I insert SD card,nothing happens.

So need help guys.
TIA

(Last edited by hrshovon on 16 May 2016, 10:57)