On 22.10.2015 00:24, Denis 'GNUtoo' Carikli wrote:
On Sat, 17 Oct 2015 12:57:54 +0200 Nico Huber nico.h@gmx.de 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 nico.h@gmx.de 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