On 09/12/2014 11:40 AM, Frans Klaver wrote:

I'm not sure. I just reproduced this on a boneblack, using your uart_v9
branch.

quoted

This problem only pops-up if you use DMA. With disabled DMA you don't
see this, right?

I get the lockup both with and without DMA enabled. Here's the 8250
config I use. Our full .config is attached in case it may provide
something relevant.

Hmm. I have a bone black here. Can you tell what you did to get this
lockup? The port configuration (unless 115200 8N1) and what you did to
get this lockup.

Something that may also help: when I have a lockup on the boneblack, dma
is enabled and something is written to console like I described earlier,
I get the following bad irq:

Full dmesg is also attached.

This one should be stuffed by this:
	"[RFC] ARM: edma: unconditionally ack the error interrupt"
	https://lkml.org/lkml/2014/9/10/714

Hope you find something useful in there.

Thanks,
Frans

Sebastian