Re: [Libreboot] flashing the c201

[Rendov Norra]

Hm. Couldn't find any documentation on that. I just tried it and it didn't
seem to make a difference.

On Friday, August 19, 2016, Duncan Guthrie <address@hidden> wrote:

> I meant clock speed option in flashrom, the spispeed= option.
>
> On 20 August 2016 01:42:42 BST, Rendov Norra <address@hidden
> <javascript:_e(%7B%7D,'cvml','address@hidden');>> wrote:
>>
>> Tried various configurations of powering /WP and /HOLD, but it still
>> doesn't want to talk. Can't find an option to set the clock speed.
>>
>> On Thursday, August 18, 2016, Rendov Norra <address@hidden 
>> <javascript:_e(%7B%7D,'cvml','address@hidden');>> wrote:
>>
>>  Yes, that's exactly what I meant. I power all three because it's suggested
>>>  various places, and the datasheet from the manufacturer states "The /WP pin
>>>  is active low" implying write protection is active when the pin is
>>>  unpowered, and "When /HOLD is brought high, device operation can resume"
>>>  implying that the hold pin needs power in order for the chip to be active.
>>>
>>>  But I'm not exactly an expert in this sort of thing, so I could be wrong.
>>>  That said, I have tried not powering those pins, but I'll probably try
>>>  again this evening (EST) just to make sure.
>>>
>>>  On
>>> Thursday, August 18, 2016, Marcel Maci <address@hidden 
>>> <javascript:_e(%7B%7D,'cvml','address@hidden');>> wrote:
>>>
>>>  Hello Paulk and Rendov
>>>>  I've never flashed a c201 but what surprises me a lot are these lines:
>>>>
>>>>  The power, hold, and wp pins are all bridged and receiving power from
>>>>
>>>>  {pin1,pin17} of the rpi, which is documented to provide 3.3v.
>>>>
>>>>
>>>>  Does "bridged" mean that you put 3.3V to all three pins? Personally I
>>>>  only power the VCC pin and I'm using pin 1 (not 17) of the Raspberry Pi.
>>>>  Hope this helps,
>>>>  Marcel
>>>>
>>>>  El 17 ago 2016, a las 3:35, Rendov Norra <address@hidden 
>>>> <javascript:_e(%7B%7D,'cvml','address@hidden');>> escribió:
>>>>
>>>>  This is a continuation of an email I sent paulk, since he suggested I post
>>>>  here as well.
>>>>
>>>>  I checked all of his suggestions except maybe if all the required pins are
>>>>  getting 3.3v. I'm not entirely clear on how to
>>>> measure that. I get ~2v
>>>>  when
>>>>  measuring from the power source to the pin, and the ground connected.
>>>>  Measuring straight from the power to ground gives me 3.3v.
>>>>
>>>>  The power, hold, and wp pins are all bridged and receiving power from
>>>>  {pin1,pin17} of the rpi, which is documented to provide 3.3v.
>>>>
>>>>  I'm wiring it according to the following documents (pdf warning):
>>>>
>>>>  https://www.winbond.com/resource-files/w25q32bv_revi_100413_
>>>>  wo_automotive.pdf
>>>>
>>>>  https://github.com/bibanon/Coreboot-ThinkPads/wiki/Hardware-
>>>>  Flashing-with-Raspberry-Pi
>>>>
>>>>
>>>>  ---------- Forwarded message ----------
>>>>  From: *Paul Kocialkowski* <address@hidden 
>>>> <javascript:_e(%7B%7D,'cvml','address@hidden');>>
>>>>  Date: Monday, August 8, 2016
>>>>  Subject: On flashing the c201
>>>>  To: Rendov Norra <address@hidden 
>>>> <javascript:_e(%7B%7D,'cvml','address@hidden');>>
>>>>
>>>>
>>>>  Hi,
>>>>
>>>>  Le dimanche 07 août 2016 à 19:45 -0400, Rendov Norra a écrit :
>>>>
>>>>  This is a bit of a longshot, but I'm pretty desperate.
>>>>
>>>>
>>>>  I managed to make chromeos boot on the c201, and external device boot is
>>>>
>>>>  off,
>>>>
>>>>  and the chromebook recovery images fail after ~5 minutes, so as far as I
>>>>
>>>>  can
>>>>
>>>>  tell, using internal spi to flash is out of the question. I've resorted to
>>>>
>>>>  hardware flashing, but I can't get it (RasPi 3) talking to the chip. And
>>>>
>>>>  it
>>>>
>>>>  boots into the firmware (and into recovery), so I know I haven't managed
>>>>
>>>>  to
>>>>
>>>>  fry it.. At least I hope.
>>>>
>>>>
>>>>  I've set the pins according to multiple sources, and re-checked them God
>>>>
>>>>  knows
>>>>
>>>>  how many times. I've tried different configurations of powering the hold
>>>>
>>>>  and
>>>>
>>>>  write protect pins. I've checked continuity between the RPi and the legs
>>>>
>>>>  of
>>>>
>>>>  the chip too many times. The write protect screw is out. I've even tried
>>>>
>>>>  having it sit in the developer/recovery screens and use the power
>>>>
>>>>  supplied by
>>>>
>>>>  the board. I've tried using upstream Flashrom, and I've tried using
>>>>
>>>>  google's
>>>>
>>>>  Flashrom. No matter what I do, it returns "Unknown SPI chip".
>>>>
>>>>
>>>>  I figured if anyone knew anything about this, it'd be you. Thanks for your
>>>>
>>>>  time.
>>>>
>>>>
>>>>  Please consider posting this to the Libreboot mailing list as well. This
>>>>  way,
>>>>  more people can help you and answer your inquiry while others can benefit
>>>>  from
>>>>  the question and its answers as well.
>>>>
>>>>  Some notes and suggestion that may help you:
>>>>  * Make sure you've followed https://libreboot.org/docs/install/c201.html
>>>>   and especially "Installing Libreboot externally, with a SPI flash
>>>>
>>>> programmer"
>>>>  * Check that the VDD, #WP and #HOLD of the chip are +3.3V during activity
>>>>  * Make sure that you're not using 1.8V logic, the chip seems to accept
>>>>  3.3V
>>>>  only
>>>>  * Make sure you've disconnected the device's battery
>>>>  * Make sure you've disconnected any source of power
>>>>  * Maybe try with the battery connected, just in case
>>>>
>>>>  Note that I'll be providing a recovery SPI flash image and rootfs with
>>>>  Debian
>>>>  that should allow recovering from these kinds of situations. Of course,
>>>>  your
>>>>  device is not irremediably bricked.
>>>>
>>>>  Cheers,
>>>>
>>>>  --
>>>>  Paul Kocialkowski, developer of low-level free software for embedded
>>>>  devices
>>>>
>>>>  Website: https://www.paulk.fr/
>>>>  Coding blog: https://code.paulk.fr/
>>>>  Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/
>>>
>>>
>>>
>>>
>>>