21 Jan
2011
21 Jan
'11
7:59 p.m.
On Fri, 21 Jan 2011, Pawel Moll wrote:
VE suffers from serious problem with MMC transfers - low performance, errors when other IO peripherals (especially USB) are used at the same time etc.
It all boils down to the MMC controller short FIFO and - in result - timing constrains. The most problematic case - USB driver hogging CPU and MMC FIFO under/overruns in the result - can be mitigated on SMP system by distributing interrupts handling for these peripherals between cores.
Wouldn't the ultimate solution be to simply use FIQs to service the MMC FIFO?
Nicolas