I have been having some issues getting a UBX-40v1 daughterboard recognized with the current master release. When using "uhd_usrp_probe" I get this error:

[INFO] [UHDlinux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_3.11.0.git-221-g298a13ac]
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Determining maximum frame size...
[INFO] [X300] Maximum frame size: 8000 bytes.
[INFO] [X300] Setup basic communication...
[INFO] [X300] Loading values from EEPROM...
[INFO] [X300] Setup RF frontend clocking...
[INFO] [X300] Radio 1x clock:200
[INFO] [RFNOC] [DMA FIFO] Running BIST for FIFO 0...
[INFO] [DEBUG] [DMA FIFO] Clock rate for BIST calculation: 0
[INFO] [RFNOC] pass (Throughput: 0.0MB/s)
[INFO] [RFNOC] [DMA FIFO] Running BIST for FIFO 1...
[INFO] [DEBUG] [DMA FIFO] Clock rate for BIST calculation: 0
[INFO] [RFNOC] pass (Throughput: 0.0MB/s)
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [RFNOC RADIO] Register loopback test passed
[ERROR] [DBMGR] The daughterboard manager encountered a recoverable error in init.
Loading the "unknown" daughterboard implementations to continue.
The daughterboard cannot operate until this error is resolved.
bad lexical cast: source type value could not be interpreted as target
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
  _____________________________________________________
 /
|       Device: X-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: X300
|   |   revision: 11
|   |   revision_compat: 7
|   |   product: 30817
|   |   mac-addr0: 00:80:2f:23:28:76
|   |   mac-addr1: 00:80:2f:23:28:77
|   |   gateway: 192.168.10.1
|   |   ip-addr0: 192.168.20.2
|   |   subnet0: 255.255.255.0
|   |   ip-addr1: 192.168.50.2
|   |   subnet1: 255.255.255.0
|   |   ip-addr2: 192.168.30.2
|   |   subnet2: 255.255.255.0
|   |   ip-addr3: 192.168.40.2
|   |   subnet3: 255.255.255.0
|   |   serial: 30B4E7A
|   |   FW Version: 5.1
|   |   FPGA Version: 33.0
|   |   FPGA git hash: 000000f
|   |   RFNoC capable: Yes
|   |
|   |   Time sources:  internal, external, gpsdo
|   |   Clock sources: internal, external, gpsdo
|   |   Sensors: ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: UBX-40 v1 (0x0078)
|   |   |   Serial: 30B1D92
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: B
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: B
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: UBX-40 v1 (0x0077)
|   |   |   Serial: 30B1D92
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: B
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: B
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       RFNoC blocks on this device:
|   |   |
|   |   |   * DmaFIFO_0
|   |   |   * Radio_0
|   |   |   * Radio_1
|   |   |   * DDC_0
|   |   |   * DDC_1
|   |   |   * DUC_0
|   |   |   * DUC_1


*Rolling back to an earlier version seems to resolve this issue.*

linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_003.010.002.HEAD-0-gbd6e21dc
-- X300 initialization sequence...
-- Determining maximum frame size... 8000 bytes.
-- Setup basic communication...
-- Loading values from EEPROM...
-- Setup RF frontend clocking...
-- Radio 1x clock:200
-- [DMA FIFO] Running BIST for FIFO 0... pass (Throughput: 1304.6MB/s)
-- [DMA FIFO] Running BIST for FIFO 1... pass (Throughput: 1304.0MB/s)
-- [RFNoC Radio] Performing register loopback test... pass
-- [RFNoC Radio] Performing register loopback test... pass
-- [RFNoC Radio] Performing register loopback test... pass
-- [RFNoC Radio] Performing register loopback test... pass
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
  _____________________________________________________
 /
|       Device: X-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: X300
|   |   revision: 11
|   |   revision_compat: 7
|   |   product: 30817
|   |   mac-addr0: 00:80:2f:23:28:76
|   |   mac-addr1: 00:80:2f:23:28:77
|   |   gateway: 192.168.10.1
|   |   ip-addr0: 192.168.20.2
|   |   subnet0: 255.255.255.0
|   |   ip-addr1: 192.168.50.2
|   |   subnet1: 255.255.255.0
|   |   ip-addr2: 192.168.30.2
|   |   subnet2: 255.255.255.0
|   |   ip-addr3: 192.168.40.2
|   |   subnet3: 255.255.255.0
|   |   serial: 30B4E7A
|   |   FW Version: 5.1
|   |   FPGA Version: 33.0
|   |   RFNoC capable: Yes
|   |
|   |   Time sources:  internal, external, gpsdo
|   |   Clock sources: internal, external, gpsdo
|   |   Sensors: ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: UBX-40 v1 (0x0078)
|   |   |   Serial: 30B1D92
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: UBX RX
|   |   |   |   Antennas: TX/RX, RX2, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: B
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: B
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: UBX-40 v1 (0x0077)
|   |   |   Serial: 30B1D92
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: UBX TX
|   |   |   |   Antennas: TX/RX, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: B
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: B
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       RFNoC blocks on this device:
|   |   |
|   |   |   * DmaFIFO_0
|   |   |   * Radio_0
|   |   |   * Radio_1
|   |   |   * DDC_0
|   |   |   * DDC_1
|   |   |   * DUC_0
|   |   |   * DUC_1

I tested this on another X300 with TwinRXs installed and they seem to initialize fine with both versions. I am wondering if it is specific to the UBX board.

Thanks,
Steve
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