On 22.10.2015 00:24, Denis 'GNUtoo' Carikli wrote: > On Sat, 17 Oct 2015 12:57:54 +0200 > Nico Huber <[email protected]> wrote: >> I'd try with the AC adapter. In that case Vcc must _not_ be connected >> to your programmer. GND, OTOH, has to stay connected. > If that happens, could the EC be destroyed? or the laptop power system? > I've a laptop that doesn't lit its leds once a power supply is > connected to it. I broke it while messing with reflashing after trying > to test ME related stuff on it. It's more likely to break a power supply. If you connect different Vcc sources you might get a current flowing in the wrong direction at the weaker source.
> On Sat, 17 Oct 2015 12:57:54 +0200 > Nico Huber <[email protected]> wrote: >>> so that this Vcc pin would be powered by them, or it is forbidden >>> to do it while using SPI programmer in the same time? >> Not forbidden. It's sometimes even encouraged because there are boards >> where the Vcc pin of the flash chip is directly connected to other >> chips, which would draw down the power from the programmer. > Robert, I think it can be detected by measuring the voltage at the pins > of the SPI programmer before and after plugging the clip. > Nico, Are there other common issues of the same kind with laptops? Doing ISP on a board that's not designed for ISP gives issues all over the place. Most can be worked around with very low clocks and a good power supply. But if you get reliable reads, writing usually works too (if there's no write protection). Nico _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
