A201开发板使用淘宝客服提供的固件(update_2053_2053.img)SD卡识别有问题_问答

插卡后kernel log见下，不知道有没有人也遇到同样的问题啊

[root@RV1126_RV1109:/]#
[root@RV1126_RV1109:/]# [ 29.412402] dwmmc_rockchip ffc60000.dwmmc: Busy; trying anyway
[ 29.912497] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)
[ 30.053072] mmc2: error -110 whilst initialising SD card
[ 30.553171] dwmmc_rockchip ffc60000.dwmmc: Busy; trying anyway
[ 31.053275] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)
[ 31.171601] mmc_host mmc2: Bus speed (slot 0) = 300000Hz (slot req 300000Hz, actual 300000HZ div = 0)
[ 31.694095] dwmmc_rockchip ffc60000.dwmmc: Busy; trying anyway
[ 32.194183] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)
[ 32.312441] mmc_host mmc2: Bus speed (slot 0) = 200000Hz (slot req 200000Hz, actual 200000HZ div = 0)
[ 32.840795] dwmmc_rockchip ffc60000.dwmmc: Busy; trying anyway
[ 33.340877] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)
[ 33.463556] mmc_host mmc2: Bus speed (slot 0) = 100000Hz (slot req 100000Hz, actual 100000HZ div = 0)
[ 33.996725] dwmmc_rockchip ffc60000.dwmmc: Busy; trying anyway
[ 34.496831] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)

自己提的问题还是得自己回，已经确认，A201的开发板电源电路与官方使用RK809设计存在不一样。
对于UHC卡，插卡后会进行协商是否支持1.8V IO工作电压进行数据通信，而实际上A201的板子只支持3.3V的供电，导致后面流程出错，进而识别不了UHC类型的卡。这时候需要修改设备树将UHC相关的支持删除，把UHC的卡当作普通的HC卡使用。

难受的是对于这个问题，咨询了半天易百纳的工程师，而且还换了一套新板子，竟然没有任何回复提到这些点。

以下是同一张卡识别为不同类型卡的kernel log。
1.识别为HC卡：
[root@RV1126_RV1109:/]#
[root@RV1126_RV1109:/]# [ 235.774265] mmc_host mmc2: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 236.015085] mmc_host mmc2: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)
[ 236.015231] mmc2: new high speed SDHC card at address aaaa
[ 236.017939] mmcblk2: mmc2:aaaa WX32G 29.7 GiB
[ 236.020805] mmcblk2: p1

2.识别为普通UHC卡：
[root@RV1126_RV1109:/]# [ 24.194935] mmc_host mmc1: Bus speed (slot 0) = 198000000Hz (slot req 200000000Hz, actual 198000000HZ div = 0)
[ 24.509865] dwmmc_rockchip ffc60000.dwmmc: Successfully tuned phase to 260
[ 24.509941] mmc1: new ultra high speed SDR104 SDHC card at address aaaa
[ 24.512294] mmcblk1: mmc1:aaaa WX32G 29.7 GiB
[ 24.514172] mmcblk1: p1

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A201开发板使用淘宝客服提供的固件(update_2053_2053.img)SD卡识别有问题

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