Serial Console Access on B3

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Revision as of 07:15, 1 November 2010 by PA Nilsson (talk | contribs)
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Author: PA


Gaining access to the serial console on B3 is neccessary if you would like to access u-boot to modify any boot parameters or to gain access without a working network.

B3 has the a serial port onboard, but is normally used only for test purposes. The serial port is 3.3V logic, so to connect it to a regular PC port the RS232 drivers would be needed outside B3.

However, FTDI has a USB->3.3V-TTL cable that can be used (TTL-232RG-VREG3V3-WE), it can be bought at various places, one is mouser.com:

http://gb.mouser.com/ProductDetail/FTDI/TTL-232RG-VREG3V3-WE/?qs=sGAEpiMZZMs5ceO8zL%252bTx5iw73fNYn2Q

On this cable the following should be connected to B3:

Orange cable (PC TX data) -> UART0_RX, testpoint 65

Yellow cable (PC RX data) -> UART0_TX, testpoint 66

Black cable -> GND, Connect to one unused PCIe latch pad


See file for description of solder points.

Serial solderpoints.JPG


In short the following needs to be done:

  • Extract the main board from the aluminum casing
  • Solder the three wires as described above
  • Connect the USB cable to your PC