我正在为 tinkerboard 2s rk3288 构建一个 buildroot 系统，它在 sd 卡（mmc0，映射到 /dev/mmcblk0）上运行完美，但我似乎没有找到 emmc 设备（mmc1）启动内核后，即使 uboot 正确识别。内核日志显示：
>> dmesg | grep mmc
[ 0.000000] Kernel command line: console=ttyS2,115200n8 root=/dev/mmcblk0p1 rootwait
[ 3.102179] dwmmc_rockchip ff0c0000.mmc: IDMAC supports 32-bit address mode.
[ 3.110858] dwmmc_rockchip ff0f0000.mmc: IDMAC supports 32-bit address mode.
[ 3.116458] dwmmc_rockchip ff0d0000.mmc: IDMAC supports 32-bit address mode.
[ 3.132245] dwmmc_rockchip ff0c0000.mmc: Using internal DMA controller.
[ 3.146360] dwmmc_rockchip ff0c0000.mmc: Version ID is 270a
[ 3.158141] dwmmc_rockchip ff0c0000.mmc: DW MMC controller at irq 70,32 bit host data width,256 deep fifo
[ 3.173065] mmc_host mmc0: card is polling.
[ 3.182045] dwmmc_rockchip ff0f0000.mmc: Using internal DMA controller.
[ 3.194553] mmc_host mmc0: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 3.195938] dwmmc_rockchip ff0f0000.mmc: Version ID is 270a
[ 3.211896] dwmmc_rockchip ff0f0000.mmc: DW MMC controller at irq 72,32 bit host data width,256 deep fifo
[ 3.223016] mmc_host mmc1: card is non-removable.
[ 3.251559] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 3.282541] dwmmc_rockchip ff0d0000.mmc: Using internal DMA controller.
[ 3.287773] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)
[ 3.287813] mmc0: new high speed SDHC card at address aaaa
[ 3.288149] mmcblk0: mmc0:aaaa SB16G 14.8 GiB
[ 3.289950] dwmmc_rockchip ff0d0000.mmc: Version ID is 270a
[ 3.289984] dwmmc_rockchip ff0d0000.mmc: DW MMC controller at irq 71,32 bit host data width,256 deep fifo
[ 3.290676] mmcblk0: p1
[ 3.302851] mmc_host mmc1: Bus speed (slot 0) = 300000Hz (slot req 300000Hz, actual 300000HZ div = 0)
[ 3.354551] mmc_host mmc1: Bus speed (slot 0) = 200000Hz (slot req 200000Hz, actual 200000HZ div = 0)
[ 3.421507] mmc_host mmc1: Bus speed (slot 0) = 187500Hz (slot req 187500Hz, actual 187500HZ div = 0)
[ 4.615481] dwmmc_rockchip ff0d0000.mmc: IDMAC supports 32-bit address mode.
[ 4.630936] dwmmc_rockchip ff0d0000.mmc: Using internal DMA controller.
[ 4.638349] dwmmc_rockchip ff0d0000.mmc: Version ID is 270a
[ 4.638365] dwmmc_rockchip ff0d0000.mmc: DW MMC controller at irq 71,32 bit host data width,256 deep fifo
[ 4.642298] dwmmc_rockchip ff0d0000.mmc: IDMAC supports 32-bit address mode.
[ 4.670795] dwmmc_rockchip ff0d0000.mmc: Using internal DMA controller.
[ 4.678198] dwmmc_rockchip ff0d0000.mmc: Version ID is 270a
[ 4.684428] dwmmc_rockchip ff0d0000.mmc: DW MMC controller at irq 71,32 bit host data width,256 deep fifo
[ 4.707375] EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Quota mode: disabled.
[ 4.921339] EXT4-fs (mmcblk0p1): re-mounted. Quota mode: disabled.
[ 15.199116] dwmmc_rockchip ff0d0000.mmc: IDMAC supports 32-bit address mode.
[ 15.213170] dwmmc_rockchip ff0d0000.mmc: Using internal DMA controller.
[ 15.220595] dwmmc_rockchip ff0d0000.mmc: Version ID is 270a
[ 15.226864] dwmmc_rockchip ff0d0000.mmc: DW MMC controller at irq 71,32 bit host data width,256 deep fifo
So far, I managed to use change the device tree from ``rk3288-tinker.dtb`` to ```rk3288-tinker-s.dtb`` in uboot configuration, the difference is precisely the mmc, I strongly suspect about any missing drivers, but couldn't find any clues on what.