Now I always unplug the AC adapter and remove the
powering up my flasher (although I do leave the chip-clip connected).
This is about right. I programmed most of INTEL platforms using dediprog
SF100: ATOM: from D4xx/D5xx (Pine Creek) series, TNC, BYT-M/I, BSW and CORE
(IVB, HSW, BDX-DE, BDW-H, SKL-Y/U), whereas for some HSW-U series it was
necessary to put platform in S5 state by shutting down them to S5. AC in
most cases removed, I did not have battery since I played with test
platforms. And there were 4x2 pins connectors for most of platforms,
recently with special small connector forms and adapters for SF100
programming heads, but in some cases I needed clip to connect directly to
On Thu, Dec 1, 2016 at 3:02 PM, Trammell Hudson <hudson(a)trmm.net> wrote:
On Thu, Dec 01, 2016 at 01:15:59PM +0000, Peter Stuge
Michael Carbone wrote:
> I have been attempting to use a raspberry pi for spi flashing and when
> use the 3.3v pin the raspberry pi
doesn't power up as the chip draws
power through the 3.3v pin for the raspberry pi to also run.
It's not the flash chip drawing current, it's the rest of the mainboard.
For some mainboards (like the 15" 2014 Macbook Pro) I had to add a 1-10
Ohm resistor on the power lead from my flasher, which basically glitches
the rest of the mainboard, but since many SPI flash chips can run at
a slightly lower voltage it allowed me to read/write the firmware.
This is probably not the right way to do it.
Looking online  some folks recommend using
laptop AC adapter +
wake-on-lan (and not using the VCC/3.3v pin), but I'm not sure
that's a dependable strategy
In fact I consider it the *only* dependable strategy. It is the
obvious way to adhere to the required power up sequence.
I've never had success with this technique due to the multi-master
situation that you described. The PCH (or ME?) on modern CPUs
seemed to always be driving the IO lines when I provided power.
Now I always unplug the AC adapter and remove the battery before
powering up my flasher (although I do leave the chip-clip
Perhaps I'm a little more YOLO with many of my test machines than
is prudent, so I don't worry too much about what other bits are being
powered up by the 3.3V rail. On the x230 I used an external bench
supply and found that the rail needed about 110 mA to function:
So on my teensy 2 flasher I replaced the small SMD regulator with
a larger UA78M33 regulator in a TO-220 package that can supply 500mA:
My biggest problem these days is that the chipclips seem to wear out
after a few hundred applications (the pins get pushed upwards, making
the connection flaky). Anyone have a recommendation for one that can
stand up to constant use?
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