[USRP-users] usrp e110 problems with rfx900
marcus.mueller at ettus.com
Fri Oct 30 05:57:56 EDT 2015
On 10/30/2015 09:04 AM, john liu via USRP-users wrote:
> -- Performing wishbone readback test... fail
uh, that's bad. The Wishbone Bus is pretty central to the inner workings
of the E110; if the readback test gives you garbage, it's not surprising
the FPGA version number is non-matching, too.
So, my first hope is that simply the FPGA image file loaded at startup
is broken on your flash memory.
However, you say it happens when a specific RFX900 is plugged in. Now, I
could imagine that specific RFX being defective, leading to some
glitches that disturb the FPGA, but you say it works on a different E110.
So, this is bound to be a process of error source elimination. Let's
call the RFX900 daughterboard with which the first E110 boots "A", and
the daughterboard with which the first USRP doesn't boot "B".
* Make sure both RFX900 (A and B) actually properly work in the second
E110 (do you have a spectrum analyzer, another USRP or something
similar to test whether the dboard actually transmits what it should
when using tx_waveforms?)
* Make sure the first E110 actually boots without daughterboard reliably
* sounds strange, but: re-seat the gumstick-sized embedded controller
of the first USRP (oh-so-gently pull it out vertically, reinsert).
o Boot w/o daughterboard
o Boot w/ B
* Make sure both E110 are equipped identically (e.g. both with or
* back up the contents of your SD card; flash an unmodified image from
 to that SD card
o try to boot without dboard
o try to boot with dboard
* buy another SD card of the same size (4GB)
o bad news: not all SD cards are created equal, and it's known
that some SD cards don't work with the E110. Sadly, it's pretty
impossible to tell without X-ray vision or destructive force who
produced the controller inside the card .
o Flash the stock image from 
+ try in the second E110 w/o daughterboard
+ try in the second E110 with "B"
+ try in the first E110 w/o daughterboard
+ try in the first E110 w/ "A" & "B"
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