JTAG wiring

I'm hoping to resurrect a bricked GoFlex Home dock using a Bus Pirate, but have never done anything like this before. My understanding is that I need to connect a cable between the Bus Pirate and the GFH unit, but I'm don't know which wires to connect to which pins.
Does anyone know where I can find a wiring diagram?

I found this here :-https://wiki.openwrt.org/toh/seagate/goflexnet#recovery_bricked_uboot_of_goflexnet_buspirate_cygwin

(Seeed Studio BusPirate - GoFlex.net)  (GoFlex.net - Seeed Studio BusPirate)
(            nc         -   1  nc   )  ( 10  GND   -    serial cable GND   )
(     6  blue   (aux)   -   2  IN   )  (  9  RxD   -    serial cable TxD   )
(     8  gray   (mosi)  -   3  TDI  )  (  8  TxD   -    serial cable RxD   )
(     9  white  (cs)    -   4  TMS  )  (  7  CN    -           nc          )
(     7  purple (clk)   -   5  TCK  )  (  6  DOT   -    10  black (miso)   )
power on goflex.net, serial, buspirate

And whilst the GoFlex side of things looks quite clear, the BusPirate side does match up with the labels on the board....

I can see where pins 2 3 4 5 6 10 on the GoFlex are connected to, but what about pins 1 7 8 9 ? No pins are labelled RxD or TxD on the BP, the missing labels are +5V VPU 3V3 ADC. I take it that pins 1 7 on GoFlex are not connected.