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Re: [Discuss-gnuradio] [USRP-users] USRP2 and UHD 3.8.3

From: Ian Buckley
Subject: Re: [Discuss-gnuradio] [USRP-users] USRP2 and UHD 3.8.3
Date: Thu, 23 Apr 2015 11:06:19 -0700

The source code for both USRP2 and N210 was updated at the same commit with the new FPGA compat number (78eab419fdcdc18f4da8fd33f267af6c4d0494f6).
Hoever because nothing changed *functionally* on USRP2 someone forgot to re-build USRP2 images for inclusion in the updated binary image package.
You are not affected because you build your FPGA from sourceā€¦it only affects (typical) users who get pre-built FPGA's from Ettus.


On Apr 23, 2015, at 10:47 AM, Jonathan Hedstrom via USRP-users <address@hidden> wrote:

Hi Martin,

Working on a MIMO project with eight USRP2's. I updated everything last night to uhd.git/release_003_008_003-1 ('uhd_usrp_probe' reports UHD_003.008.003-0-g87dfdc3c) and a custom FPGA image based on fpga.git/UHD-3.8.3. Everything seems to be working correctly. Looking at u2_core.v it seems that the compatibility version is correctly changed to v11.1 (from 10.1 previously). What am I missing?

Is this only a problem if you're using the usrp2_fpga.bin image downloaded with the uhd_images_downloader app? I didn't test this.

[ jonathan hedstrom ]

On Thu, Apr 23, 2015 at 11:12 AM, Martin Braun via USRP-users <address@hidden> wrote:
Dear USRP2 users,

(*Note:* this does not affect N2x0, or any other device! Only USRP2,
with the SD-Card).

The latest release (3.8.3) has an issue where UHD won't let you use
USRP2s. Apologies for missing that during testing and RC phases. Latest
maint (and master) contain a fix for this, and future releases will also

If you need to run USRP 2 with a stable release, we recommend 3.8.2,
although the USRP2 code (both host- and FPGA-side) has not changed in a
long time, so older versions will also work.

So, what happened? Our latest release actually had some changes for
N2x0, mostly related to UBX fixes. As a consequence, we updated the N2x0
FPGA images, and increased the compat number. On USRP2, nothing was
changed at all, but due to shared host driver code, UHD is looking for
the same compat number on both devices. Since we didn't touch USRP2
specifically, it fell through in our testing.

This fix simply provides separate compat numbers for USRP2 and N2x0. The
actual FPGA image for USRP2 never changed, so you don't need to burn the
SD card for this. If you already did, that's also fine -- the current
FPGA images for USRP2 are legit.



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