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sudo flashrom –r ~/efi/read1.bin -V -p linux_spi:dev=/dev/spidev0.0
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rav wrote: Hey all,
The mac I'm trying to get into is a A1502 EMC2678. I've got the RebelSim clip and it seems to clip onto the port just fine.
Attached is my setup, I've gotten FlashRom installed correctly on my Rasperry Pi. I've double checked to make sure that SPI is enabled.
The error I get when I runis "No EEPROM/flash device found"sudo flashrom –r ~/efi/read1.bin -V -p linux_spi:dev=/dev/spidev0.0
Seems like my wires are mismatched or something. I believe that I have the right GPIO config, triple checked it.
Not sure what else I am missing.
Any help is greatly appreciated.
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Bigwezel wrote: There is probably not going enough power from the pi to the chip. Do you use original power cord to power up the raspberry?
I've had power issue's before. Sometimes there is some capacitor dropping the voltage causing not enough power going to the chip. What you can try is connecting a 85 watt charger to the board and than read out the chip. When you connect the charger without battery it powers the board on automaticcaly. Make sure you turn of the board with the charger on the board before you read the chip.
thaGH05T wrote: Yea, please test your voltage, the purpose of this clip is to not remove the logic board, and usually when we conduct a flash with it we are connecting the battery and sometimes magsafe to counteract the capacitors and/or resistors that may be causing the drop in your case. Use the maximum rated power supply recommended for your pi to help reduce loss on the Pi's end. Your wires seem to be short enough so let us know what your next tests hold.
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sergioz wrote: Hi. Ok, It's definitely a clip problem. I've got MBA 11 Mid-2013 and had to open my own MBA 13 Mid-2013 to check this thing out. Even with external power it drains the power out of the machine. Once connected and switched on, both machines are shutting down. When I disconnect the clip, they power on back again. I've tried switching pins, provide additional power through Arduino Power supply with switcheable v3.3 and V5. Same result. It gives me a strong feeling that power escapes through somewhere when the clip is connected. I also tried Raspberry Pi 2 with the same result. In fact I prefer Bus Pirate because it was able to write chips that I was unable to write with Raspberry sometimes. But this is just a matter of preference, I think.
Maybe the circuit is shorted? The leakage is so bad that no matters if the computer is powered on, with or without battery connected or even with 45W/60W Power supply in, same result.
Any suggestions? I had like two clients already and I really would like to avoid de soldering the chip and do it old school style. Also, I think it would go better with normal 8 pin clip when there's no switchable or hardwired pins, because it gives more control.
Thanks.
neighborhoodguy wrote: The reason it doesnt work on certain models is becuase the eeprom is not getting power - thats why it sometimes you need the battery or magsafe or need it running. Also why you sometimes get a dump that starts with data and the rest is blank. Sometimes the eeprom gets power from PP3V3_SUS and sometimes its PP3V3_SUS_ROM. Helps to check the schematics.
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I'm having the same problem. I turn on the mac and wait for the folder to start flashing. Once I connect the clip on the board it cuts out. Immediately the mac chime plays when I remove the clip. I am using a 5v @ 2.4a for the pi, and a 85W 20v @ 4.25a charger for the mac. I've tried it with the battery connected only, battery and magsafe, magsafe only. All the same results where the mac gets powered off with the clip on the board. I am thinking, should I get higher output power cables for the mac and pi?
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