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Before > > [..] > >>>> OK. that patch won't change anything then. Can you try this patch instead? >>> >>> Config I am using is basically defconfig wrt memory parameters, yeah, i use 4k. >>> >>> So I tested that patch, thank you, and some other different configurations -- >>> nothing helped. Exactly the same behaviour with the same backtrace. >> >> Did you test the first (4k check) or the second (don't remap on ARM) patch? > > The second one. I think you mentioned that first one won't help for 4k pages. > > >>> So it seems that it is firmware problem after all? >> >> There is no GPU firmware involved in this operation. It's just a >> posted write. E.g., we write to a register to flush the HDP write >> queue and then read the register back to make sure the write posted. >> If the second patch didn't help, then perhaps there is some issue with >> MMIO access on your platform? > > I didn't mean GPU firmware at all. I only had uefi/EL3 firmwares in mind. > > Completely out of the blue, based on nothing, do you think that > adding delay/some mem barrier between write and read might help? That would still be quite some platform bug. > I wonder if host data path code should be executed during common desktop > usage as a common user then why it doesn't break later. Maybe it's some kind of write/read re-ordering issue. But yeah, I also think this is this motherboard problem. Thank you. You should probably ping some ARM guys to figure out what the fault code actually means. Regards, Christian. > > Thanks, > Alexey >