Date: Fri, 30 May 1997 02:33:30 +0900 From: Kenjiro Cho <kjc@csl.sony.co.jp> To: freebsd-hackers@FreeBSD.ORG Cc: Chuck Cranor <chuck@maria.wustl.edu> Subject: misaligned access to EDO RAM Message-ID: <199705291733.CAA20576@hotaka.csl.sony.co.jp>
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Does anyone know if it is OK to perform misaligned-burst-access to EDO RAM? The DMA unit of an ENI ATM PCI card seems to lock up when it performs misaligned-burst-access crossing 1KB boundary. (e.g. 64-byte-burst from 0xf02663c4 but no problem with 512B boundary e.g. from 0xf02661c4) It happens with a machine with ECC EDO DIMM (dell optiplex GXpro). The lockup doesn't occur with other machines with fastpage DRAM (all P6-200s with Natoma). I suspect the 1K boundary comes from the EDO internal structure, but I'm not sure if the specs (EDO, Natoma, PCI) allow to do that. Any idea? Am I missing something? --kj
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