1. interrupts 체크
# cat /proc/interrupts | grep mmc
45: 160 0 0 0 GIC-0 161 Level mmc0
46: 0 0 0 0 GIC-0 159 Level mmc1
47: 1223 0 0 0 GIC-0 157 Level mmc2
2. debugfs 활용 (mount -t debugfs none /sys/kernel/debug)
# cat /sys/kernel/debug/mmc0/ios
clock: 50000000 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: 7 (sd uhs DDR50)
signal voltage: 1 (1.80 V)
driver type: 0 (driver type B)
# cat /sys/kernel/debug/mmc2/ios
clock: 100000000 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: 9 (mmc HS200)
signal voltage: 1 (1.80 V)
driver type: 0 (driver type B)
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