Difference between revisions of "Serial Console Access on B3"

From BubbaWiki
Jump to navigation Jump to search
(Created page with '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.<br> B3 ha...')
 
 
(One intermediate revision by one other user not shown)
Line 1: Line 1:
Author: PA
<br>
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.<br>  
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.<br>  


Line 30: Line 34:


*Connect the USB cable to your PC
*Connect the USB cable to your PC
*Open your favorite serial communication program (e.g. PuTTY)
*Find out what your system called the USB cable (e.g., COM1, /dev/ttyUSB0)
*Set the speed/baud rate to 115200.
*Connect!

Latest revision as of 13:23, 26 November 2011

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
  • Open your favorite serial communication program (e.g. PuTTY)
  • Find out what your system called the USB cable (e.g., COM1, /dev/ttyUSB0)
  • Set the speed/baud rate to 115200.
  • Connect!