Hi, With changing the line 362 of the 'usr/src/sys/arch/mac68k/mac68k/pmap_bootstrap.c', my IIci can reboot cleanly on SBC 4.99.7 and 3.1. I don't understand what this change means, but it seems 'perfect' to me. :) Thanks so much for the good work to Sungwon ! Kazu Inanaga