4 Replies Latest reply on Mar 6, 2015 1:27 PM by Intel_Alvarado

    is DMA available on Edison, also which CPU datasheet for reference

    hk101

      I could not find any mention of DMA capability in the Atom CPU ( intended for low power => so remove DMA?)

      I looked in the following folder for Atom CPU data sheet :Intel® Atom™ Processor Technical Resources

      but could not figure out exactly which data sheet to download.

      I am assuming this CPU data sheet is the correct one for reference : Intel® Atom™ Processor Z540/Z530/Z520/Z510/Z500 Datasheet

       

      Anyone has better info?

        • 1. Re: is DMA available on Edison, also which CPU datasheet for reference
          deium

          hk101  You can issue cat /proc/cpuinfo from the console and get more info/capabilities on the Edison cpu.  As far as a data sheet Intel will have to answer that.  See the thread at https://communities.intel.com/message/255139#255139 - Intel will release more documentation https://communities.intel.com/community/makers/edison/documentation when time comes.

           

          it also appears that there is a DMA in 0x00001000-0x00ffffff in the page tables, 32 pages memmap and 3991 pages LIFO batch:0

           

          processor      : 1

          endor_id      : GenuineIntel

          cpu family      : 6

          model          : 74

          model name      : Genuine Intel(R) CPU  4000  @  500MHz

          stepping        : 8

          microcode      : 0x810

          cpu MHz        : 500.000

          cache size      : 1024 KB

          physical id    : 0

          siblings        : 2

          core id        : 1

          cpu cores      : 2

          apicid          : 2

          initial apicid  : 2

          fdiv_bug        : no

          f00f_bug        : no

          coma_bug        : no

          fpu            : yes

          fpu_exception  : yes

          cpuid level    : 11

          wp              : yes

          flags          : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf nonstop_tsc_s3 pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes rdrand lahf_lm 3dnowprefetch ida arat epb dtherm tpr_shadow vnmi flexpriority ept vpid tsc_adjust smep erms

          bogomips        : 998.40

          clflush size    : 64

          cache_alignment : 64

          address sizes  : 36 bits physical, 48 bits virtual

          power management:

          • 2. Re: is DMA available on Edison, also which CPU datasheet for reference
            Eric_Ding

            From Intel® Edison Module Hardware Guide.pdf, cpu info is as below:

            Intel® Atom™ Processor Z34xx Series is the next generation 22 nm SoC product targeted for the smartphone market

            segment. The SoC contains dual IA-32 cores operating at 500 MHz.  The architecture includes 2-wide instruction

            decode and Out Of Order Execution with 1 MB cache shared between the two CPU cores. It includes Intel SIMD

            Extensions 2, 3, 4 (SSE2, SSE3, SSE4.1/4.2). 

            • 3. Re: is DMA available on Edison, also which CPU datasheet for reference
              deium

              ARK showed z3460 z3480 as 64 bit

              • 4. Re: is DMA available on Edison, also which CPU datasheet for reference
                Intel_Alvarado

                Hi,

                 

                DMA is not available on Edison and there are no plans to make it available.

                 

                Sergio