On Wed, May 23, 2018 at 1:43 AM, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote: > On Tue, May 22, 2018 at 10:10:12PM -0700, Andrey Smirnov wrote: >> The call to create_flat_mapping() in mmu.c will change both memory >> type and shareability of all RAM in use by barebox while MMU is on >> when done in conjunction with CONFIG_MMU_EARLY. > > I notice that with MMU_EARLY enabled we call create_flat_mapping() > twice, once in the early MMU code and once when setting up the MMU for > real. In between we remap the the SDRAM cached which then is reverted > during the second call to create_flat_mapping(). > > This seems unnecessary. Does the following help you? Yeah, this, disabling MMU before or having a tlb_invalidate() after all seem to help. Your patch works fine, but it has a slight weirdness in my case because early MMU code would mark OCRAM as cached and regular MMU code wouldn't undo it without the call to create_flat_mapping(), so I'd end up with slightly different memory configuration depending on if EARLY_MMU is enabled or not. Other than that it should work fine. The main reason I chose to go "disable MMU" route is because that follows what ARMv8 MMU code does, but I am perfectly happy with either solution. Thanks, Andrey Smirnov _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
