Consecutive writes to rxmmu table results in system freeze #50
Comments
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How are you writing? -dma, block mem copy, or a slow for loop of e-writes? What if any is the difference in behaviour between the three cases? 2016-02-16 10:32 GMT-05:00 Ola Jeppsson notifications@github.com:
Andreas Olofsson, CEO/Founder at Adapteva Linkedin: linkedin.com/in/andreasolofsson |
No dma, I only use dma_alloc_coherent() to allocate the memory region. It doesn't matter which value I write. It's a for loop around iowrite32() |
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I stand corrected, not always on same addr .... |
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Or rather, if I don't write to the high 32 bits, I get slightly further Always the same address though. No difference if I have no sleep or 100 msec sleep between iterations. Looks like some queue is filling up? |
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If I interleave with reads (ignoring writing to upper 32 bits) |
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@aolofsson |
Use static remapping & disable MMU until this is fixed: "Consecutive writes to rxmmu table results in system freeze" aolofsson/oh#50 This prevents weird memory corruption that can otherwise happen with faulty Epiphany programs. Signed-off-by: Ola Jeppsson <ola@adapteva.com>
Use static remapping & disable MMU until this is fixed: "Consecutive writes to rxmmu table results in system freeze" aolofsson/oh#50 This prevents weird memory corruption that can otherwise happen with faulty Epiphany programs. Signed-off-by: Ola Jeppsson <ola@adapteva.com>
Use static remapping & disable MMU until this is fixed: "Consecutive writes to rxmmu table results in system freeze" aolofsson/oh#50 This prevents weird memory corruption that can otherwise happen with faulty Epiphany programs. Signed-off-by: Ola Jeppsson <ola@adapteva.com>
Until MMU table entries have a valid bit we must initialize all RXMMU table entries to point to a safe 1MB region.
When I try to do that, the system freezes.
[0x31a00000-0x31b00000] is a 1MB contiguous reserved region (dma_alloc_coherent()).
This is reproducible, always gets stuck on the same write.
Inserting sleeps doesn't make any difference.
Log:
Hard freeze
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