# The FPGA build is not compatible with the host code build **URL:** \ **Category:** GNU Radio\ **Created:** [April 14, 2015, 3:55pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553 "2015-04-14T15:55:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [April 14, 2015, 3:55pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553/1 "2015-04-14T15:55:42Z")
Hi all, I’m a new user of GNURadio and USRP. I used the script “build-gnuradio” to download the source and have installed them all.But when I tried the “uhd\_fft”, the terminal showed as belows: Linux; GNU C++ version 4.6.3; Boost\_104800; UHD\_003.008.002-168-gddae9468 – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes RuntimeError: Please update the firmware and FPGA images for your device. See the application notes for USRP2/N-Series for instructions. Expected FPGA compatibility number 11, but got 10: The FPGA build is not compatible with the host code build. Please run: “/usr/local/lib/uhd/utils/uhd\_images\_downloader.py” “/usr/local/lib/uhd/utils/usrp\_n2xx\_simple\_net\_burner” –addr=“192.168.10.2” I followed the instruction as above. However, the problem still exists. I noticed that the images it downloaded is “uhd-images\_003.008.002-157-gbe03e694.zip”,which seemed to be not compatible with UHD\_003.008.002-168-gddae9468. Can anyone tell me how to figure it out ? which of the files on [files.ettus.com:/binaries/images/](http://files.ettus.com/binaries/images/) is number 11? Thanks very much. Yue – View this message in context: [http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html](http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![cczhengy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/b487fb/32.png) [@cczhengy](https://www.ruby-forum.com/u/cczhengy)\ **Post date:** [April 14, 2015, 4:29pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553/2 "2015-04-14T16:29:48Z")
This is unusual. Not sure how that slipped past. I’ve got a query in to Ettus engineering to see where the slip is. On 2015-04-14 09:38, cczhengy wrote: > – Current send frame size: 1472 bytes > > Yue > > – > View this message in context: > [http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html](http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html) > [2] > Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). > > * * * > > Discuss-gnuradio mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) [3] Links: ---
**Author:** ![cczhengy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/b487fb/32.png) [@cczhengy](https://www.ruby-forum.com/u/cczhengy)\ **Post date:** [April 14, 2015, 4:38pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553/3 "2015-04-14T16:38:51Z")
Also, just to confirm, you did power-cycle the N210 unit after burning new firmware? On 2015-04-14 09:38, cczhengy wrote: > – Current send frame size: 1472 bytes > > Yue > > – > View this message in context: > [http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html](http://gnuradio.4.n7.nabble.com/The-FPGA-build-is-not-compatible-with-the-host-code-build-tp53288.html) > [2] > Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). > > * * * > > Discuss-gnuradio mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) [3] Links: ---
**Author:** ![cczhengy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/b487fb/32.png) [@cczhengy](https://www.ruby-forum.com/u/cczhengy)\ **Post date:** [April 14, 2015, 6:05pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553/4 "2015-04-14T18:05:07Z")
Hey, we did update our FPGA images on the N-Series for the next upcoming release. You will need to update the device according to our manual ([USRP Hardware Driver and USRP Manual: USRP2 and N2x0 Series](http://files.ettus.com/manual/page_usrp2.html)). This change was necessary (among other things) for the N-Series to support our new UBX daughterboard. Note that you might have to git pull again – we didn’t properly sync up code and images release last week, so you might be stuck between the code change and the images update. After git pulling, run uhd\_images\_downloader. Cheers, Martin