[coreboot] Power supply and X220

[Albin]

Thank you John Lewis and, again, Persmule.

I've now successfully flashed coreboot onto the machine with a disabled
ME and just booted into GNU/Linux.

I connected 3.3v to pin 3 on the BBB (instead of an ATX) and reapplied
the Pomona clip a few times. Then, finally, the chip was recognized. \o/


Happy hacking!

Albin

Den 2017-03-21 kl. 16:47, skrev John Lewis:
> Dear Albin,
> 
> 
> As for Persmule, I've never had the need to use an ATX power supply, or
> anything beyond the external BBB power supply and the two 3.3v
> pins/holes on the BBB itself when flashing Chromebooks externally.
> 
> 
> If the chip isn't being recognised, the most likely culprits are:
> 
> 
> 1. That you attached the clip the wrong way round.
> 
> 2. The pins on the clip aren't making proper contact with the legs on
> the chip.
> 
> 3. You've mis-wired the setup to begin with.
> 
> 
> Regards,
> 
> 
> John.
> 
> 
> On 21/03/17 11:59, Persmule wrote:
> 
>> Dear Albin,
>>
>> You should only power your BBB with an external 5V power supplier, and
>> connect its usb peripheral port to your controlling computer. I have
>> never used any ATX power supplier for this, just the configuration I
>> just described is enough.
>>
>> Best regards,
>>
>> Persmule
>>
>> 在 2017年03月21日 18:55, Albin 写道:
>>> Dear Persmule,
>>>
>>> First, thank you for your work on free software. I'm following your
>>> guide[1] to replace Bios on my Thinkpad X220 with a neutralized
>>> coreboot using a BBB rev. C and an ATX power supply for the v3.3 pin,
>>> but flashrom is unable to recognize the chip. Did you have any
>>> problems recognizing the chip on your device and do you have any
>>> ideas of what to try?
>>>
>>> "image" at #coreboot suggested that I should connect the power cable
>>> to the machine instead of using an external power supply but I
>>> haven't read anywhere that this should work or even be safe.
>>>
>>> My current setup worked for reflashing a macbook2,1 but not for this
>>> x220.
>>>
>>> Again, any advice would be highly appreciated.
>>>
>>> Best,
>>>
>>> Albin
>>>
>>> 1.
>>> https://hardenedlinux.github.io/firmware/2016/11/17/neutralize_ME_firmware_on_sandybridge_and_ivybridge.html
>>
>>
>>
> 
>