Re: [Libreboot] flashing the c201

[Paul Kocialkowski]

Le vendredi 19 août 2016 à 17:52 -0700, Rendov Norra a écrit :
> Hm. Couldn't find any documentation on that. I just tried it and it didn't
> seem to make a difference.

Perhaps you should try another flasher then? I have never used a Raspberry Pi to
flash the C201, but I've had success with FT2232-based and CH341A-based
flashers.

> 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','ts
> > > > > 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.h
> > > > > tml
> > > > >   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/
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
-- 
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/

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