the 1/2 speed is because cgminer (and older versions of bfgminer) do not support multi-chip miners and see only the first chip.
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[2014-04-02 03:08:21] nanofury_lowl_probe: Matched "NanoFury NF2 v0.5 by MLM" serial "0000142845", but mcp2210 lowlevel driver failed to open it
[2014-04-02 03:08:22] Probing for an alive pool
[2014-04-02 03:08:22] Network difficulty changed to 96.8M (693.1Th/s)
[2014-04-02 03:08:22] Stratum from pool 0 detected new block
[2014-04-02 03:08:22] Pool 0 is hiding block contents from us
[2014-04-02 03:08:23] mcp2210_spi_transfer: Failed to continue SPI transfer (1 bytes remaining)
[2014-04-02 03:08:23] mcp2210_set_cfg_spi: Error setting current SPI config (248)
[2014-04-02 03:08:23] NFY 0 failure, attempting to reinitialize
[2014-04-02 03:08:23] mcp2210_spi_transfer: Failed to continue SPI transfer (1 bytes remaining)
[2014-04-02 03:08:23] mcp2210_set_cfg_spi: Error setting current SPI config (248)
1. sudo aptitude update
2. sudo aptitude install libudev-dev libusb-1.0-0-dev libfox-1.6-dev autotools-dev autoconf automake libtool libncurses-dev yasm curl libcurl4-openssl-dev libjansson-dev pkg-config uthash-dev make pkg-config yasm
1. git clone git://github.com/signal11/hidapi.git hidapi
2. cd hidapi
3. ./bootstrap
4. ./configure --prefix=/usr
5. make
6. sudo make install
1. mkdir miner
2. cd miner
3. wget http://luke.dashjr.org/programs/bitcoin/files/bfgminer/3.8.1/bfgminer-3.8.1.tbz2
4. tar xvf bfgminer-3.8.1.tbz2
5. cd bfgminer-3.8.1
6. ./configure
7. make
--disable-avalon Compile support for Avalon (default enabled)
--enable-cpumining Build with cpu mining support(default disabled)
--enable-opencl Compile support for OpenCL (default disabled)
--disable-adl Build without ADL monitoring (default enabled)
--disable-bitfury Compile support for Bitfury (default enabled)
--enable-bfsb Compile support for BFSB (default disabled)
--disable-bigpic Compile support for Big Picture Mining USB (default enabled)
--disable-littlefury Compile support for LittleFury (default enabled)
--disable-nanofury Compile support for NanoFury (default enabled)
--disable-hashbuster Compile support for HashBuster Nano (default enabled)
--disable-hashbuster2 Compile support for HashBuster Micro (default if libusb)
--enable-metabank Compile support for Metabank (default disabled)
--disable-bitforce Compile support for BitForce (default enabled)
--disable-icarus Compile support for Icarus (default enabled)
--disable-klondike Compile support for Klondike (default enabled)
--enable-knc Compile support for KnC (default disabled)
--disable-modminer Compile support for ModMiner (default enabled)
--disable-x6500 Compile support for X6500 (default enabled)
--disable-ztex Compile support for ZTEX (default if libusb)
--enable-scrypt Compile support for scrypt mining (default disabled)
--with-system-libblkmaker Use system libblkmaker rather than bundled one (default disabled)
--without-sensors Build with libsensors monitoring (default enabled)
--without-curses Compile support for curses TUI (default enabled)
--without-libmicrohttpd Compile support for libmicrohttpd getwork server (default enabled)
--without-libevent Compile support for libevent stratum server (default enabled)
--without-libusb Compile using libusb (default enabled)
--without-libudev Autodetect FPGAs using libudev (default enabled)
1. sudo nano /boot/cmdline.txt
then add dwc_otg.speed=1 at the end of line
1. cd miner
2. cd bfgminer-3.8.1
3. sudo ./bfgminer
lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/3p, 480M
|__ Port 1: Dev 3, If 0, Class=vend., Driver=smsc95xx, 480M
|__ Port 3: Dev 4, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 4: Dev 5, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 1: Dev 6, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 4: Dev 7, If 0, Class=HID, Driver=usbhid, 12M
lsusb
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 006: ID 04d8:00de Microchip Technology, Inc. <-- USB Miner
Bus 001 Device 007: ID 04d8:00de Microchip Technology, Inc. <-- USB Miner
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
Bus 001 Device 005: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
./bfgminer -o stratum+tcp://stratum.d7.lt:3333 -u username -p password -S nanofury:all --set-device NFY:osc6_bits=33
NO DEVICES FOUND: Press 'M' and '+' to add
# NF2
ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="00de", SUBSYSTEMS=="usb", ACTION=="add", MODE="0666", GROUP="root"
2014-03-25 04:01:06] hid_devinfo_scan: Found "NanoFury NF2 v0.5 by MLM" serial "0000100001"
[2014-03-25 04:01:06] hid_devinfo_scan: Found "NanoFury NF2 v0.5 by MLM" serial "0000100002"
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:005 (path=(null), vid=1a40, pid=0101, manuf=(null), prod=USB 2.0 Hub, serial=(null))
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:004 (path=(null), vid=1a40, pid=0101, manuf=(null), prod=USB 2.0 Hub, serial=(null))
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:003 (path=(null), vid=0424, pid=ec00, manuf=(null), prod=(null), serial=(null))
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:007 (path=(null), vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100001)
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:006 (path=(null), vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100002)
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:001 (path=(null), vid=1d6b, pid=0002, manuf=Linux 3.10.25+ dwc_otg_hcd, prod=DWC OTG Controller, serial=bcm2708_usb)
[2014-03-25 04:01:06] lowlevel_scan: Found usb device at usb:001:002 (path=(null), vid=0424, pid=9512, manuf=(null), prod=(null), serial=(null))
[2014-03-25 04:01:06] lowlevel_scan: Found hid device at hid:/dev/hidraw1 (path=/dev/hidraw1, vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100001)
[2014-03-25 04:01:06] lowlevel_scan: Found hid device at hid:/dev/hidraw0 (path=/dev/hidraw0, vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100002)
[2014-03-25 04:01:06] lowlevel_scan: Found mcp2210 device at hid:/dev/hidraw0 (path=/dev/hidraw0, vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100001)
[2014-03-25 04:01:06] lowlevel_scan: Found mcp2210 device at hid:/dev/hidraw1 (path=/dev/hidraw1, vid=04d8, pid=00de, manuf=Microchip Technology Inc., prod=NanoFury NF2 v0.5 by MLM, serial=0000100002)
[2014-03-25 04:01:06] mcp2210_set_cfg_gpio: Failed to set current GPIO config
[2014-03-25 04:01:06] mcp2210_get_gpio_input: Failed to get current GPIO input values
[2014-03-25 04:01:06] mcp2210_set_cfg_gpio: Failed to set current GPIO config
[2014-03-25 04:01:06] mcp2210_set_cfg_gpio: Failed to set current GPIO config
[2014-03-25 04:01:06] mcp2210_get_gpio_input: Failed to get current GPIO input values
[2014-03-25 04:01:06] mcp2210_set_cfg_gpio: Failed to set current GPIO config
[2014-03-25 04:01:06] nanofury_lowl_probe: Matched "NanoFury NF2 v0.5 by MLM" serial "0000100001", but failed to detect nanofury
[2014-03-25 04:01:06] mcp2210_set_cfg_gpio: Failed to set current GPIO config
[2014-03-25 04:01:06] mcp2210_get_gpio_input: Failed to get current GPIO input values
[2014-03-25 04:01:06] mcp2210_get_gpio_input: Failed to get current GPIO input values
[2014-03-25 04:01:06] nanofury_lowl_probe: Matched "NanoFury NF2 v0.5 by MLM" serial "0000100002", but failed to detect nanofury
[2014-03-25 04:01:06] INFO: bitfury_detect
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:06] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:07] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:07] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:07] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:07] Unable to open SPI device: No such file or directory
[2014-03-25 04:01:07] No Bitfury chips detected!
[2014-03-25 04:01:07] ManageTUI: (none): No new devices found
[2014-03-26 01:43:29] mcp2210_get_configs: Failed to get current SPI config
Select processor to manage using up/down arrow keys
[2014-03-26 01:43:29] NFY 0: Failed to open mcp2210 device
NFY 0 : Initializing... [2014-03-26 01:43:29] NFY 0 failure, exitingSegmentation fault
root@raspberrypi:/usr/bfgminer/bfgminer-3.10.0#