Mango reg sd card error

on mango red i put sd card into the slot and get next error

340.569996] mmc0: mmc_sd_init_card() failure (err = -84)
[ 340.574443] mmc0: error -84 whilst initialising SD card


you can refer to a few topics here:

I remember I used WP76 + R9 FW, it can detect Sandisk 8G SD card and Apacer 2G SD card.

mango red sd card reader is support all classes of micro sd?
i have mmmc hc 4 class and its mounted and class 10 gets error -84?

As i know the sd clock cannot be faster than 60MHz due to the sdio expansion chipset on mangoh board.
Suggest you try somd more other sd card.