Messages in this thread |  | | Date | Wed, 8 Aug 2018 12:39:28 +0100 | From | Catalin Marinas <> | Subject | Re: framebuffer corruption due to overlapping stp instructions on arm64 |
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On Fri, Aug 03, 2018 at 01:09:02PM -0400, Mikulas Patocka wrote: > while (1) { > start = (unsigned)random() % (LEN + 1); > end = (unsigned)random() % (LEN + 1); > if (start > end) > continue; > for (i = start; i < end; i++) > data[i] = val++; > memcpy(map + start, data + start, end - start); > if (memcmp(map, data, LEN)) {
It may be worth trying to do a memcmp(map+start, data+start, end-start) here to see whether the hazard logic fails when the writes are unaligned but the reads are not.
This problem may as well appear if you do byte writes and read longs back (and I consider this a hardware problem on this specific board).
-- Catalin
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