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Most CF Cards Fail DMA Transfers

Posted by kdawson on from the it's-all-in-the-controller dept.

Anomalyst writes "In his quest to create an open source video camera, Andrey Filippov of elphel.com has determined that most Compact Flash devices, although claiming to be DMA capable, do not perform Direct Memory Access transfers correctly. This means successful movement of data to and from the device takes much more time with DMA disabled." The culprit appears to be the controller chip packaged with most of the CF cards Filippov tried. We last visited Elphel and their work on open source digital cameras in 2002. Filippov gave a Tech Talk at Google last year.

5 of 140 comments (clear)

  1. From the utterly irrelevant department by Gothmolly · · Score: 2, Funny

    What's next, some USB mice fail at implementing the USB 2.0 standard? Or some random printer which claims to support PCL really doesn't?

    Geesh, talk about a slow news day.

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    I want to delete my account but Slashdot doesn't allow it.
  2. Re:Open source?? by Anonymous Coward · · Score: 1, Funny

    I asked the same question, and was able to educate myself in about 30 seconds with Google. Try that next time...

  3. Andrey Filippov by pushing-robot · · Score: 1, Funny

    God damn it, why can't I have that last name?

    --
    How can I believe you when you tell me what I don't want to hear?
    1. Re:Andrey Filippov by maxume · · Score: 2, Funny

      I imagine you could, if you really wanted to.

      --
      Nerd rage is the funniest rage.
  4. Re:Market leader? by djdavetrouble · · Score: 4, Funny

    I upgraded from onboard audio to an X-Fi Fatal1ty. My Kill to Death ratio went up by about 25% within a few days.

    NEVER underestimate the power of.... Celebrity Endorsement !

    Get the Fatal1ty mousepad to go up another percent.

    --
    music lover since 1969