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sdcard_debug.md

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BAD vs GOOD card in debian

  1. No card inserted - coldboot
root@debian:~# cat /proc/interrupts | grep mmc                                             
  16:         13         13         13         13   IO-APIC-fasteoi   mmc0

root@debian:~# cat /sys/kernel/debug/mmc0/ios 
clock:          0 Hz
vdd:            0 (invalid)
bus mode:       1 (open drain)
chip select:    0 (don't care)
power mode:     0 (off)
bus width:      0 (1 bits)
timing spec:    0 (legacy)
signal voltage: 0 (3.30 V)

root@debian:~# cat /sys/kernel/debug/mmc0/clock 
0
  1. BAD card inserted - coldboot
root@debian:~# cat /proc/interrupts | grep mmc
  16:         13         13         13         13   IO-APIC-fasteoi   mmc0

after card removal:

root@debian:~# cat /proc/interrupts | grep mmc
  16:         13         14         13         13   IO-APIC-fasteoi   mmc0

root@debian:~# cat /sys/kernel/debug/mmc0/ios
clock:          0 Hz
vdd:            0 (invalid)
bus mode:       1 (open drain)
chip select:    0 (don't care)
power mode:     0 (off)
bus width:      0 (1 bits)
timing spec:    0 (legacy)
signal voltage: 0 (3.30 V)

root@debian:~# cat /sys/kernel/debug/mmc0/clock 
0
  1. BAD card inserted - coldboot
root@debian:~# cat /proc/interrupts | grep mmc                                             
  16:        187        197        197        204   IO-APIC-fasteoi   mmc0

root@debian:~# cat /sys/kernel/debug/mmc0/ios 
clock:          50000000 Hz
actual 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:    2 (sd high-speed)
signal voltage: 0 (3.30 V)

cat /sys/kernel/debug/mmc0/clock                                            
50000000