jffs2 corruption on busy local bus.
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From: comp.arch.embedded on 12 Apr 2010 12:34 Did anyone encounter something like the following: I have a system with linux accessing jffs2 nand via a busy local bus. I run into one of the three: random file corruption, magic bit mask 1985 not found, or kernel traps ( BUG_ON(!PageUptodate(pg)) ): ie deadlocks with page_cache_read in the garbage collector. What's keeping the local bus busy is burst mode DMA to a FIFO device. The processor is a powerpc 83XX with a local bus controller supporting : and enbedded NAND flash controller, generic single cycle bus access and UPM ( programmable timing ) to support my burst mode dma. My apologies, I seem these days to be asking questions and not helping to answer them. TTB
From: Vladimir Vassilevsky on 12 Apr 2010 15:16
comp.arch.embedded wrote: > Did anyone encounter something like the following: > > I have a system with linux accessing jffs2 nand via a busy local bus. > I run into one of the three: random file corruption, magic bit mask > 1985 not found, or kernel traps ( BUG_ON(!PageUptodate(pg)) ): ie > deadlocks with page_cache_read in the garbage collector. > > What's keeping the local bus busy is burst mode DMA to a FIFO device. > The processor is a powerpc 83XX with a local bus controller > supporting : and enbedded NAND flash controller, generic single cycle > bus access and UPM ( programmable timing ) to support my burst mode > dma. > > My apologies, I seem these days to be asking questions and not helping > to answer them. Disclaimer: I am not familiar with PPC and linux, however I've ran into similar problems with different systems. Looks like NAND flash driver times out due to the bus congestion. The simplest would be increase the timeout period for operations. Also, you can probably adjust the DMA and CPU core priorities for the bus. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com |