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about usb wifi speed on dm355 evm.

YHLShareware
Intellectual 830 points

All,

Could anyone use wifi device with usb interface on DM355 EVM? Did anyone test its speed on DM355 EVM?

I installed a device based on chipset ZD1211 and made it work on DM355 EVM. I got its speed is about 9Mbits/s. Can I get more higher speed on DM355 EVM? Thanks in advance.

 

Best Regards,

Jeff

  • TI__Expert 7435 points

    DM355 USB is definitely capable of supporting far higher throughput than 9Mbps.  Which kernel version are you using ?

    Pl. also ensure that the DM355 USB driver is using DMA mode.  Enable the same in the Inventra config if not enabled already.

    regards

    swami

  • in reply to swami
    Intellectual 830 points

    Swami,

    My kernel version is montavista 2.6.10. My DM355 USB driver should work in DMA mode. Did you mean that wifi driver need to support DMA mode? Your much help is apperciated. Thanks.

     

    Best Regards,

    Jeff

  • in reply to YHLShareware
    TI__Mastermind 37340 points

    Jeff,

    Kernel version 2.6.10 is too general, all our DVSDK releases for DM355 thus far are based on this kernel.  Are you using the latest DVSDK (1.30.00.41)?  If so, I believe DMA is enabled by default (Host mode) in USB drivers but you can always refer to PSP document SPRUFG0 (included  in DVSDK) to get details on what kernel configuration options are available for USB devices.

  • in reply to Juan Gonzales
    Intellectual 830 points

    Hi All,

    I found a serious issue when I used usb hub with inserting WIFI device zydas 1211b based WIFI dongle and usb storage disk.

    1. During starting the linux kernel, I got many error messages

    "FAT: Filesystem panic (dev sda1)
        fat_get_cluster: invalid cluster chain (i_pos 0)
    ls: /usb/merge: Input/output error "

    2. After finishing the linux kernel boot, I loaded the wifi device driver module (insmod zd1211b.ko) and wifi device can work.

        When I did bandwidth test using IPERF(bandwidth test tool), frequently I got errors :

    "Tx status: -110, Error Occur in zd1211_rx_comp_cb, nonzero read bulk status received: -EPROTO", and usb storage disk can not be written (it was set as read-only filesystem).

    Your much help is appreciated. Thanks in advance.

     

    Best Regards,

    Jeff

  • Intellectual 460 points

    Could you tell me what product you purchased containing the ZD1211 chipset and any issues you had getting it to work?

    I am looking for a WiFi USB adapter to use with a product I am developing with the DM355.

    thanks,

    -howy