Finally, make sure that the Pomona clip makes contact with the metal wires of the chip.ĭO NOT connect +3.3V until the clip is connected. Make sure the pinouts are correct otherwise, Flashrom will fail to detect a chip, or it will “detect” a 0x0 chip. Alternatively, you can use a dupont lead on the RPi GPIO header but on the test clip side, strip, tin and solder to the pins on the test clip (and use heatshrink tubing for insulation and strain relief).ĭiagram of the 26 GPIO Pins of the Raspberry Pi Model B (for the Model B+ with 40 pins, start counting from the right and leave 14 pins): Some test clips will have the pins too close, but you can bend them so that your dupont leads will fit. The RPi has male GPIO header pins, on which you can use female dupont leads on the other end you normally also use female lead, so get female 2.54mm / 0.1inch dupont female-female (F-F) leads. It will either be a Pomona 5252 or look very similar to it. Search for SO8/SOIC8/SO-IC8/SOIC-8 test clip. This is called In System Programming or ISP for short. This is a special clip (popular brand is the Pomona 5252 test clip). If your flash chip is a SOIC-8 and mounted to a mainboard, you can use a test clip. Test Clip pinout for SO8/SOIC8/SOIC-8 flash chip