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Interfacing to (mini) PCI-E devices

Ryan Hapgood
Prodigy 20 points
Other Parts Discussed in Thread: OMAP3503

We've recently started prototyping with a Gumstix Overo (OMAP3503) and have now discovered we may need to add a mini PCI-E device (with USB pins 36,38 N/C). I guessed that there would be a simple bridge chip that would allow us to use the USB host as the interface to the processor but cannot find anything appropriate. I know of at least one product that must do this, the Ubiquiti SR71-USB, as it uses the Atheros AR9280 (with PCI-E IF) but not surprisingly have had no response from them.

I'm hoping someone may have some experience with PCI-E / OMAP35xx relations they're willing to share? I'm not particularly fond of having to change processor at this point.

Edit: I've received a Ubiquiti SR71-USB and not surprisingly it does not use the advertised chipset. Support has confirmed this but not commented as to whether they will fix their datasheets.

  • 0
    Prodigy 10 points

    I have been working the same issue with a need to get to PCIe.  So far I have only found the solution of going to a platform that supports the PCIe x1 at the start.  V.ery interested in using small gumstix form factor though if such a solution is possible

     

  • 0 in reply to seavee
    Prodigy 20 points

    That could be the case. I've since realised even if I can interface the hardware I'm going to need to customise the drivers and that's making it less feasible. The best solution for us is to abandon the PCI-e device and find a USB equivalent. Not easy but easier it seems.