GRAY        BLACK           diff on the gray
PWRCON      0xe3780     0x1e3780        bit 20 unset    # clock power ctrl
PWRCONEXT   0x273e      0x277e          bit 6 unset     # ................ 2
                                        -> nand ?
PCGCCTL     0x0         0x0             -
GRTCTL      0x80000001  0x80000000      bit 0 set (core soft reset)
INTMSK      0x4010420   0x4010420       -