[coreboot] Power supply and X220

[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
>
>
>

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