> Hi Dan, > > Dan Snyder wrote: > > I am attempting to use the hardware encryption support provided by the 5271 > > and am running into this problem. (Access Error Exception when attempting > > to read/write from userspace). How can I modify the kernel to allow access > > to 0x40000000 through 0x401b009f ? > > Section 11.4 of the 5271 RM seems to be what you are looking for. > It describes the access control implemented on this part. > > > > I have been poking through the kernel headers for hours now and I am still > > clueless. > > You probably won't find anything associated with this in the headers, > since the kernel doesn't generally support any of these types of > features. > > > > I believe I need to add the address range to > > /arch/m68knommu/platform/527x/config.c but I am not sure if this is correct > > or exactly how to do so. > > config.c would be an ok place to set this. I suspect you want > to add something like: > > writeb(0x04, 0x40000030) > > which sets the GPACR0 register to allows kernel and user > modes to have read/write access. > > > > Any guidance would be much appreciated. Thank you > > Regards > Greg
Thank you Greg, this worked perfectly. The reference manual had confused me by its suggestion to use the MOVEC instruction to set these registers. - Dan _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
