I am trying sleep and wake up my Kobo Mini ebook reader manually by using the command rtcwake. The reader is using busybox.cat /proc/version gives me this output:Linux version 2.6.35.3-850-gbc67621+ (gallen@gallen-P5KPL-AM-BM) (gcc version 4.4.4 (4.4.4_09.06.2010) ) #617 PREEMPT Mon Apr 22 11:07:47 CST 2013rtcwake sets the reader to sleep but fails with this message:wakeup from mem at Wed Nov 13 18:02:44 2013rtcwake: short write...and does not wake up again. After some googling I tracked the error down to the removable micro sd card which the reader uses as its primary (and only) storage. Which means that the whole system is running on that sd card which is being removed on standby.I also found another user with the same problem on a completely different device but also with a removable sd card as the primary storage. He solved the problem by enabling the kernel option/parameterMMC_UNSAFE_RESUME.Now my question: How do I set/enable/activate this parameter?Do I have to recompile the kernel? My problem is that I am a complete noob on this topic and Google ony finds source codes and discussions about source codes. 
How do I enable kernel option MMC_UNSAFE_RESUME
kernel;busybox;sd card