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Re: [Discuss-gnuradio] Recent Changes to UHD causing issue for USRP1?

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Recent Changes to UHD causing issue for USRP1?
Date: Mon, 25 Apr 2011 18:18:36 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110223 Lightning/1.0b2 Thunderbird/3.1.8

> Device Address:
>     serial: 4c745353
> I am 'feeding' in the serial number on the UHD: USRP source block.
> I was trying to use uhd_find_devices as the diagnostic tool.
> I should repeat that on the 'good' environment, the probe indentifies
> USRP DBs correctly.

So to recap:

* The UHD cannot read the eeprom on USRP1 on your older machine: No
dboard IDs no mboard serial number.

* But same USRP1 works perfectly fine on another computer.

* However, the libgnuradio-usrp driver can read the eeprom perfectly
fine on both computers.

So, the firmware is actually doing the I2C transactions. The reads from
a host perspective are just libusb control transactions. One thing that
comes to mind, what libusb are you running? libgnuradio-usrp uses
libusb0.1, but UHD is exclusively libusb1.0. Perhaps you have old buggy
libusb1.0 implementation on your older machine? Something along those

My best guess,

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