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Re: port-arm/54614: playing with uaudio panics on rpi
IIRC, we've seen this problem with uvideo before as well.
We should just loosen this assertion in the ARM bus_dma code and explicitly allow zero-length bus_dmamap_sync operations (as a no-op).
> On Oct 12, 2019, at 6:25 AM, sc.dying%gmail.com@localhost wrote:
> [ 26.9767799] panic: kernel diagnostic assertion "len > 0 && offset + len <= map->dm_mapsize" failed: file "/usr/src/sys/arch/arm/arm32/bus_dma.c", line 1058 len 0 offset 0 mapsize 4096
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