ChibiOS Free Embedded RTOS

I use internal pullups, its OK.

For test you'd better try SDC example testhal\STM32F4xx\SDC, you may throw out everythyng from main.c and use only the folowing functions:
halInit
chSysInit
sdcStart
sdcConnect
and finally sdcRead/sdcWrite

no need in any pin manipulations in this case.

Do I understand right that ULPI is not officially supported?

Thanks Giovanni!

Digging chibios surprisingly gave me the only set of DMA and FIFO settings that works.

First of all, I use STMcube HAL, but the STM's support is useless, so excuse me for bugging you guys here.

When write to SD card, SDIO controller ALWAYS stops exactly at the last 16 bytes of data (DCOUNT = 0x10), TXUNDERR flag raises in STA register.
At the same time, the corresponding DMA stops ...

I am not yet really familiar with ChibiOS, so I ask because I am searching an alternative to STM's native HAL.