Hi Stephen, Get the MemoryMap using GetMemoryMap function calls and run the memory test , where the memory type belongs to "EfiConventionalMemory" type. Other memory type regions are used for the different purpose. Please check EFI_MEMORY_TYPE and table 25 in the UEFI Spec.
Thanks, Ramesh -----Original Message----- From: Kinney, Michael D [mailto:michael.d.kin...@intel.com] Sent: Saturday, January 25, 2014 12:14 AM To: edk2-devel@lists.sourceforge.net Subject: Re: [edk2] DMA memory regions and device behavior Stephen, A memory stress test can only be run on memory regions that are allocated using AllocatePages() or AllocatePool(). Drivers that use DMA will allocate memory for the DMA buffers. Those buffers show up in the EFI Memory Map through the GetMemoryMap() API as allocated regions. Best regards, Mike -----Original Message----- From: Stephen Polkowski [mailto:step...@centtech.com] Sent: Friday, January 24, 2014 9:56 AM To: edk2-devel@lists.sourceforge.net Subject: [edk2] DMA memory regions and device behavior UEFI gurus, Does UEFI have an api for querying the DMA regions in the memory system? I would like to know where they are. I need to write a memory stress test shell application. The application will need to read/write all the DRAM with patterns. I am worried that it will hit a usb or network buffer while a DMA is in progress. Can I assume that there will be no DMAs until I make a read or write call to a UEFI device? To put it another way, if my application is running in it's own code segment, can I assume that their are no DMAs happening simultaneously? Thanks for your help. Stephen -- Stephen Polkowski Centaur Technology Austin, TX (512) 418-5730 ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
