On Thu, Jan 29, 2015 at 08:25:54PM +0100, Robert Jarzmik wrote: > Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> writes: > > > On Thu, Jan 29, 2015 at 10:12:46AM +0100, Wjatscheslaw Stoljarski wrote: > >> Hello, > >> > >> If I try to read from first 4k RAM on imx53/imx6, with md or from code, > >> barebox show stacktrace with mesage: > >> "unable to handle NULL pointer dereference at address 0x...". > >> Is it possible in some way do that? > > > > The only way I know is to disable CONFIG_MMU in the config. > I think the solution in arch/arm/boards/mioa701/board.c (remapping the 0x0 > address) should work here : > docg3_iospace = map_io_sections(0x0, (void *)0xe0000000, 0x2000); We could create a /dev/zeropage with the code above. That would make the zero page generally available. I don't know if this is worth the effort though. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
