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SD Card with STM32F405 and STMCube SDIO driver does not work in 4-bit mode

Question asked by dolezal.ivan on Jan 16, 2015
Latest reply on Jan 26, 2015 by dolezal.ivan
I have double checked all connections of SD card socket to uC on our board. We also have pull-up resistors there.
Required setting of 4-bit access can be seen in the SDIO_CLKCR.WIDBUS register during debugging but function disk_initialize called in f_mount retutns FR_NOT_READY.
Any opinion?
However, it is suspicious that I had to increase the SCLK divider to low the SCLK frequency for a reliable work (in 1-bit mode).