boards/jiminy-256rfr2: Fuse, Troubleshooting
boards/jiminy-256rfr2: Fuse, Troubleshooting

Added explanation for fuse settings.
Brown-out when 1.8V is set as system voltage.
Power increase in deep sleep when ext. xtal as system clock.

A-Paul/RIOT,josephnoir/RIOT,yogo1212/RIOT,OTAkeys/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,smlng/RIOT,mtausig/RIOT,cladmi/RIOT,authmillenon/RIOT,jasonatran/RIOT,aeneby/RIOT,lazytech-org/RIOT,miri64/RIOT,biboc/RIOT,smlng/RIOT,kYc0o/RIOT,jasonatran/RIOT,toonst/RIOT,aeneby/RIOT,biboc/RIOT,RIOT-OS/RIOT,mtausig/RIOT,smlng/RIOT,lazytech-org/RIOT,gebart/RIOT,mfrey/RIOT,x3ro/RIOT,gebart/RIOT,authmillenon/RIOT,x3ro/RIOT,kYc0o/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kYc0o/RIOT,OlegHahm/RIOT,basilfx/RIOT,gebart/RIOT,OTAkeys/RIOT,kaspar030/RIOT,mtausig/RIOT,toonst/RIOT,OlegHahm/RIOT,BytesGalore/RIOT,BytesGalore/RIOT,toonst/RIOT,miri64/RIOT,toonst/RIOT,BytesGalore/RIOT,mfrey/RIOT,kYc0o/RIOT,A-Paul/RIOT,jasonatran/RIOT,yogo1212/RIOT,OTAkeys/RIOT,josephnoir/RIOT,mtausig/RIOT,biboc/RIOT,aeneby/RIOT,authmillenon/RIOT,rfuentess/RIOT,yogo1212/RIOT,josephnoir/RIOT,mfrey/RIOT,ant9000/RIOT,lazytech-org/RIOT,ant9000/RIOT,aeneby/RIOT,mfrey/RIOT,mtausig/RIOT,gebart/RIOT,biboc/RIOT,basilfx/RIOT,authmillenon/RIOT,miri64/RIOT,A-Paul/RIOT,josephnoir/RIOT,cladmi/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,x3ro/RIOT,RIOT-OS/RIOT,gebart/RIOT,x3ro/RIOT,cladmi/RIOT,jasonatran/RIOT,miri64/RIOT,kYc0o/RIOT,miri64/RIOT,biboc/RIOT,ant9000/RIOT,yogo1212/RIOT,ant9000/RIOT,BytesGalore/RIOT,smlng/RIOT,josephnoir/RIOT,cladmi/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,rfuentess/RIOT,BytesGalore/RIOT,rfuentess/RIOT,rfuentess/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,kaspar030/RIOT,ant9000/RIOT,basilfx/RIOT,smlng/RIOT,x3ro/RIOT,mfrey/RIOT,authmillenon/RIOT,A-Paul/RIOT,aeneby/RIOT,toonst/RIOT,jasonatran/RIOT,OTAkeys/RIOT,kaspar030/RIOT,basilfx/RIOT,basilfx/RIOT,yogo1212/RIOT,A-Paul/RIOT,authmillenon/RIOT,cladmi/RIOT,kaspar030/RIOT