Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 23 Oct 2003 11:31:53 +0200 | From | Zoltan Menyhart <> | Subject | Re: [RFC] prevent "dd if=/dev/mem" crash |
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Some machines may require special memory zones, e.g. for ia64 architectures you need to keep the "minimal state save" area for the Processor Abstraction Layer in un-cached memory. If you read the memory "in the usual way" then you access the memory through the HW caches. The ia64 architecture forbids to have both cached and un-cached access to the same memory location (by any of the CPUs, DMAs), otherwise you create a cache paradox => machine check. Think twice before even trying a "dd if=/dev/mem"...
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