> Now I always unplug the AC adapter and remove the battery before > 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 flash. Zoran On Thu, Dec 1, 2016 at 3:02 PM, Trammell Hudson <hud...@trmm.net> wrote: > On Thu, Dec 01, 2016 at 01:15:59PM +0000, Peter Stuge wrote: > > Michael Carbone wrote: > > > I have been attempting to use a raspberry pi for spi flashing and when > I > > > use the 3.3v pin the raspberry pi doesn't power up as the chip draws > too > > > much 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 [1] 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 > connected). > > 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: > > https://www.flickr.com/photos/osr/28494632165/lightbox > > 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: > > https://www.flickr.com/photos/osr/30531707094/lightbox > > 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? > > -- > Trammell > > -- > coreboot mailing list: coreboot@coreboot.org > https://www.coreboot.org/mailman/listinfo/coreboot >
-- coreboot mailing list: coreboot@coreboot.org https://www.coreboot.org/mailman/listinfo/coreboot
