RK3288 android 7.1 EMMC 问题导致卡死在开机logo 界面
1、在调试 rk3288 android 7.1 遇到部分机器不能开机的问题 logo 如下：
init: Waiting for /dev/.coldboot_done...
[ 3.024810] init: Waiting for /dev/.coldboot_done took 0.00s.
[ 3.024848] init: /dev/hw_random not found
[ 3.025097] keychord: using input dev rk29-keypad for fevent
[ 3.035910] init: write_file: Unable to open '/proc/sys/abi/swp': No such file or directory
[ 3.036094] init: write_file: Unable to open '/sys/module/rockchip_pm/parameters/policy': No such file or directory
[ 3.036498] fs_mgr: Warning: unknown flag resize
[ 3.036620] init: /dev/hw_random not found
[ 3.036715] init: write_file: Unable to open '/sys/block/mmcblk0/bdi/read_ahead_kb': No such file or directory
[ 3.037215] fs_mgr: Warning: unknown flag resize
[ 3.217970] mmcblk2: error -110 sending stop command, original cmd response 0x900, card status 0x400900
[ 3.217986] mmcblk2: error -110 transferring data, sector 746528, nr 8, cmd response 0x900, card status 0x900
[ 3.217997] mmcblk2: retrying using single block read
[ 3.218159] mmcblk2: retrying because a re-tune was needed
[ 3.224562] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.225265] mmcblk2: retrying because a re-tune was needed
[ 3.231736] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.231845] mmcblk2: error -84 transferring data, sector 746536, nr 8, cmd response 0x900, card status 0xb00
[ 3.231890] mmcblk2: retrying using single block read
[ 3.238314] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.238415] mmcblk2: error -84 transferring data, sector 746536, nr 8, cmd response 0x900, card status 0x0
[ 3.238457] blk_update_request: I/O error, dev mmcblk2, sector 746536
[ 3.244867] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.245073] mmcblk2: error -84 transferring data, sector 746538, nr 6, cmd response 0x900, card status 0x0
[ 3.245117] blk_update_request: I/O error, dev mmcblk2, sector 746538
[ 3.251521] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.251728] mmcblk2: error -84 transferring data, sector 746540, nr 4, cmd response 0x900, card status 0x0
[ 3.251773] blk_update_request: I/O error, dev mmcblk2, sector 746540
[ 3.258175] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.258389] mmcblk2: error -84 transferring data, sector 746542, nr 2, cmd response 0x900, card status 0x0
[ 3.258435] blk_update_request: I/O error, dev mmcblk2, sector 746542
[ 3.264857] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.265044] mmcblk2: retrying because a re-tune was needed
[ 3.268952] random: nonblocking pool is initialized
[ 3.271560] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.271679] mmcblk2: error -84 transferring data, sector 746544, nr 240, cmd response 0x900, card status 0xb00
[ 3.271720] mmcblk2: retrying using single block read
[ 3.278149] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.278252] mmcblk2: error -84 transferring data, sector 746544, nr 240, cmd response 0x900, card status 0x0
[ 3.278264] blk_update_request: I/O error, dev mmcblk2, sector 746544
[ 3.284671] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.284845] mmcblk2: error -84 transferring data, sector 746546, nr 238, cmd response 0x900, card status 0x0
[ 3.284854] blk_update_request: I/O error, dev mmcblk2, sector 746546
[ 3.291271] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.291608] mmcblk2: error -84 transferring data, sector 746550, nr 234, cmd response 0x900, card status 0x0
[ 3.291620] blk_update_request: I/O error, dev mmcblk2, sector 746550
[ 3.298044] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.298223] mmcblk2: error -84 transferring data, sector 746552, nr 232, cmd response 0x900, card status 0x0
[ 3.298236] blk_update_request: I/O error, dev mmcblk2, sector 746552
[ 3.304661] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.305150] mmcblk2: error -84 transferring data, sector 746558, nr 226, cmd response 0x900, card status 0x0
[ 3.305163] blk_update_request: I/O error, dev mmcblk2, sector 746558
[ 3.311562] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.311741] mmcblk2: error -84 transferring data, sector 746560, nr 224, cmd response 0x900, card status 0x0
[ 3.311752] blk_update_request: I/O error, dev mmcblk2, sector 746560
[ 3.318157] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
[ 3.318329] mmcblk2: error -84 transferring data, sector 746562, nr 222, cmd response 0x900, card status 0x0
[ 3.324731] dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
二、通过logo dwmmc_rockchip ff0f0000.dwmmc 基本可以肯定是emmc 出现了问题，然后尝试着 降低EMMC clk
然后基本就可以判定是 硬件EMMC 走线有问题了。
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