SDIO read_block hangs

[atoktoto]

I managed to get SDIO working with 2 configurations:

• 1-bit bus @ ClockFreq::F4Mhz
• 4-bit bus @ ClockFreq::F1Mhz

With those card reads and writes correctly.

With anything else, it initalizes but the sdio.read_block() call hangs indefinitely or I get RxOverFlow error.

I'm using STM32F411CEU6 (black pill v2) with clocks configuration is as follows:

let clocks = rcc
    .cfgr
    .require_pll48clk()
    .sysclk(72.MHz())
    .hclk(72.MHz())
    .pclk1(36.MHz())
    .pclk2(72.MHz())
    .freeze();

Any idea what might be the reason?