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使用金属的隔离柱也是可以的，但要注意使用垫片以保护电路板。

查看emmc/sd卡接口工作模式

Code Block
languagebash
themeMidnight
root@phyboard-mira-imx6-7:~# cat /sys/kernel/debug/mmc1/ios
clock:          52000000 Hz
actual clock:   49500000 Hz
vdd:            7 (1.65 - 1.95 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    8 (mmc DDR52)
signal voltage: 0 (1.80 V)
root@phyboard-mira-imx6-7:~# cat /sys/kernel/debug/mmc0/ios
clock:          50000000 Hz
actual clock:   49500000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    2 (sd high-speed)
signal voltage: 0 (3.30 V)

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关闭系统自带的framebuffer console

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