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
https://hardenedlinux.github.io/firmware/2016/11/17/neutralize_ME_firmware_o...
Hi!
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. For a x220 the 3,3V regulator on the BBB likely doesn't supply enough current, since the Thinkpads usually don't have a diode in the power supply line of the SPI flash and so you power part of the board when you apply the 3,3V to the flash chip. Using an ATX power supply for the 3,3V can be quite dangerous though; if you connect it to the wrong pins, you can easily fry your board, since it can supply quite some current.
Regards Felix
On Tue, Mar 21, 2017 at 8:56 AM, Felix Held felix-coreboot@felixheld.de wrote:
For a x220 the 3,3V regulator on the BBB likely doesn't supply enough current, since the Thinkpads usually don't have a diode in the power supply line of the SPI flash and so you power part of the board when you apply the 3,3V to the flash chip
I just flashed an x220 for someone a week or so back, had no issues with using just the 3.3v from the BBB (which was powered via 5v DC input). I did have to connect WP/HOLD (pins 3/7) to 3.3v as well though, IIRC.
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:
That you attached the clip the wrong way round.
The pins on the clip aren't making proper contact with the legs on
the chip.
- 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
https://hardenedlinux.github.io/firmware/2016/11/17/neutralize_ME_firmware_o...
No problem, Albin. All the things I suggested are of course things I've done at various stages. ;)
Those SOIC clips also need taking care of, and the unfortunate fact is, the more you attach and detach them, the more likely you are to bend one of the pins on the clip.
So, if you're trying to compile and flash you own build, it's a good idea to set the board up in such a way that you can have the clip attached and power the board up with the display attached at the same time, so you can see if your latest attempt worked or not without stressing the clip by removing and reattaching it. Touch wood I'm still on my second clip. :)
All the best,
John.
On 21 Mar 2017, 21:38, at 21:38, Albin albin@fripost.org wrote:
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:
That you attached the clip the wrong way round.
The pins on the clip aren't making proper contact with the legs on
the chip.
- 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
https://hardenedlinux.github.io/firmware/2016/11/17/neutralize_ME_firmware_o...
-
Albin -
Felix Held -
John Lewis -
Matt DeVillier -
Persmule