Hello. > > I have a problem with NOR flash when enabling MMU. > > Probably this happen due NOR start address is 0x0. > > Should we a remap memory addresses same as we do it for kernel? > > Or can someone tell what could be the problem? > > This is because the zero page is set to faulting so that you can > catch NULL pointer exceptions. You could disable this (see > vectors_init), but then you can't catch NULL pointer exceptions > anymore. So the best you can do is use map_io_sections and map > your flash to some free region, maybe like this: > > map_io_sections(0x0, (void *)SZ_1M, SZ_32M); > > Then register your flash flash with address 1M instead of 0x0. So, this problem is gone. I found a next one MMU-related problem. When I turn on option MMU_EARLY, barebox is entered to an endless loop or die, I am not sure. Probably problem is in "create_sections" procedure from mmu.c, since I tried to add some debug before this procedure and we reach this mark, after this procedure we dead. Can you get me a point for find a solution? Below is a debug output with CONFIG_MMU_EARLY turned on. barebox 2013.02.0-00235-g2de8827-dirty #25 Thu Feb 7 12:54:06 MSK 2013 Board: Cirrus Logic CLEP7212 initcall-> 0xc0788518 register_device: platform initcall-> 0xc079c988 register_device: fs initcall-> 0xc079e04c initcall-> 0xc0794264 initcall-> 0xc079c958 xmalloc c0380008 (size 1024) initcall-> 0xc079e170 initcall-> 0xc07886fc register_driver: clps711x_serial initcall-> 0xc079e004 xmalloc c0380410 (size 136) register_device: clps711x_serial0 xmalloc c03804a0 (size 192) register_device: cs0 xmalloc c0380568 (size 28) xmalloc c03805a8 (size 28) initcall-> 0xc078709c register_device: global initcall-> 0xc079dec4 xmalloc c03805e8 (size 24) request_region ok: 0xc0000000:0xc1ffffff xmalloc c0380608 (size 36) xmalloc c0380640 (size 36) xmalloc c0380678 (size 136) register_device: mem0 initcall-> 0xc079fd24 request_region ok: 0xc07f4003:0xc07f8002 xmalloc c0380708 (size 36) mmu: ttb: 0xc07f4003 (nothing more) --- _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
