On Wed, Oct 21, 2020 at 04:51:39PM +0200, Michael Tretter wrote: > Barebox uses the zero page to trap NULL pointer dereferences. However, > if the SDRAM starts at address 0x0, this makes the first page of the > SDRAM inaccessible and makes it impossible to load images to offset 0x0 > in the SDRAM. > > Trapping NULL pointer dereferences on such systems is still desirable. > Therefore, add a function to disable the traps if accessing the zero > page is necessary and to re-enable the traps after the access is done. > > The zero_page_memcpy function simplifies copying to the SDRAM, because > this is the most common required functionality, but memtest also > accesses the zero page and does not use memcpy. > > Signed-off-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx> Applied, thanks Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 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
