Slashdot Mirror

← Back to Stories (view on slashdot.org)

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.

3 of 140 comments (clear)

  1. frosty piss by Anonymous Coward · · Score: -1, Offtopic

    enjoy!

    This comment is GPLv3 licensed.

  2. Good work by Anonymous Coward · · Score: -1, Offtopic

    Maybe one day I'll see a camera with a bog standard USB connector that doesn't need a specific driver just to see the camera's contents as a drive?

    1. Re:Good work by LanceUppercut · · Score: -1, Offtopic

      I hope you do understand that what you are talking about has no relation to the problem described in the original article whatsoever...