LibreELEC-MXQ4K:~ # dmesg | grep mmc
[    0.736514] dwmmc_rockchip 30000000.mmc: IDMAC supports 32-bit address mode.
[    0.736873] dwmmc_rockchip 30010000.mmc: IDMAC supports 32-bit address mode.
[    0.737027] dwmmc_rockchip 30000000.mmc: Using internal DMA controller.
[    0.737046] dwmmc_rockchip 30000000.mmc: Version ID is 270a
[    0.737173] dwmmc_rockchip 30000000.mmc: DW MMC controller at irq 57,32 bit host data width,256 deep fifo
[    0.737501] dwmmc_rockchip 30000000.mmc: Got CD GPIO
[    0.737547] dwmmc_rockchip 30020000.mmc: IDMAC supports 32-bit address mode.
[    0.738140] dwmmc_rockchip 30010000.mmc: Using internal DMA controller.
[    0.738161] dwmmc_rockchip 30010000.mmc: Version ID is 270a
[    0.738239] dwmmc_rockchip 30010000.mmc: DW MMC controller at irq 58,32 bit host data width,256 deep fifo
[    0.738516] dwmmc_rockchip 30010000.mmc: allocated mmc-pwrseq
[    0.738535] mmc_host mmc1: card is non-removable.
[    0.739109] dwmmc_rockchip 30020000.mmc: Using internal DMA controller.
[    0.739133] dwmmc_rockchip 30020000.mmc: Version ID is 270a
[    0.739214] dwmmc_rockchip 30020000.mmc: DW MMC controller at irq 59,32 bit host data width,256 deep fifo
[    0.739426] mmc_host mmc2: card is non-removable.
[    0.748653] mmc_host mmc0: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[    0.751402] mmc_host mmc1: Bus speed (slot 0) = 2343750Hz (slot req 400000Hz, actual 390625HZ div = 3)
[    0.751935] mmc_host mmc2: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[    0.795747] mmc_host mmc1: Bus speed (slot 0) = 2343750Hz (slot req 300000Hz, actual 292968HZ div = 4)
[    0.805132] mmc_host mmc2: Bus speed (slot 0) = 300000Hz (slot req 300000Hz, actual 300000HZ div = 0)
[    0.824543] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)
[    0.824623] mmc0: new high speed SDHC card at address aaaa
[    0.825865] mmcblk0: mmc0:aaaa SB32G 29.7 GiB
[    0.829842]  mmcblk0: p1 p2
[    0.845557] mmc_host mmc1: Bus speed (slot 0) = 2343750Hz (slot req 200000Hz, actual 195312HZ div = 6)
[    0.861782] mmc_host mmc2: Bus speed (slot 0) = 200000Hz (slot req 200000Hz, actual 200000HZ div = 0)
[    0.898753] mmc_host mmc1: Bus speed (slot 0) = 2343750Hz (slot req 100000Hz, actual 97656HZ div = 12)
[    0.924821] mmc_host mmc2: Bus speed (slot 0) = 100000Hz (slot req 100000Hz, actual 100000HZ div = 0)
[    2.182919] fsck: /dev/mmcblk0p1: 22 files, 19795/65501 clusters
[    2.977095] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
LibreELEC-MXQ4K:~ #