From mboxrd@z Thu Jan 1 00:00:00 1970 From: robin.randhawa@gmail.com (Robin Randhawa) Date: Mon, 18 Jan 2010 21:35:20 +0000 Subject: Elusive crash in SMC91X/PXA network code? In-Reply-To: References: Message-ID: <20100118213519.GA58659@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Jan 18, 2010 at 06:27:19PM +0000, Michael Abbott wrote: > The bug in question is most reliably forced by transferring a very large > file over NFS while the embedded driver is performing DMA transfers (from > FPGA to XCEP RAM); it is also possible to force the crash by sending > enough UDP packets to the device; I've had no success in forcing the crash > with any other form of network load. It can take anything from a few > seconds to many minutes of such stress for the crash to occur. This sounds almost exactly like a problem I've experienced before, although that was on a development board built around a different processor architecture. Kept experiencing mysterious memory junking which seemed to precipitate quicker when performing large file transfers over NFS. The ethernet controller (an Intel eepro 100 IIRC) had diagnostics which seemed to indicate checksumming errors. After trying virtually every trick in the book, it turned out to be a subtle misconfiguration of the SDRAM RAS-to-CAS delay timing which the bootloader had messed up. With that fixed, everything worked without a hitch. Worth a shot, IMHO. Cheers, Robin