Comment # 5 on bug 998440 from Giacomo Comes

I have tested your dracut module script on three cherryview PC.
Acer Aspire R11, Intel compute stick STK1AW32SC, Dell Inspiron 11-3168
In every PC /sys/bus/acpi/devices/INT33FF:00 is present so the module
pinctrl-cherryview is inserted in the initrd and the sd card is working.
However, the Dell Inspiron 11-3168 does not need such module. The SD card
is not accessed as /dev/mmcblk0 but as /dev/sdb. Actually on such laptop 
the sd card reader has always worked and because of that I was not aware that 
it was a cherryview system.

I have tested a modified version of the module script. This one checks the
presence of /sys/bus/mmc/drivers/mmcblk which does exist if the card is
accessed as /dev/mmcmlk0 and is missing if the sd card is accessed as /dev/sdb

Here is the modified check function I have tested.

check() {
  test -d /sys/bus/acpi/devices/INT33FF:00 && test -d
/sys/bus/mmc/drivers/mmcblk
}

With this modified check, the pinctrl-cherryview module is inserted in the
initrd
only for the PC that really needs it.