Hi, On 06.03.2018 00:20, Jesse Li wrote: > Hey, > > I'm trying to read from and flash to a W25X40ALSNIG [0] that's still > mounted to its hard drive PCB. Following the table from the raspberry pi > wiki page [1], and assuming the raspberry pi pin numbers it mentions are > physical pin numbers (and not the pi's strange GPIO numbering scheme) I > connected the legs of the flash chip to the raspberry pi's GPIO pins. > However, when the two are attached, the pi won't boot (it'll show the three > raspberries in the corner, then it shuts off). I've isolated this to the > VCC (connected to header 17, 3v3) and GND (connected to header 25, GND) , > where having all of the legs of the flash chip detached from the pi except > for those two will reproduce my problem (I hope testing that didn't > actually kill the chip). What am I missing?
the circuitry of your hard drive is most likely not prepared for powe- ring the flash chip directly at its VCC pin. You probably power all 3V3 parts on that PCB which is too much for your RPi's PSU / voltage conver- ter. Killing the SPI flash is unlikely. I can't say the same about other chips on the board, though. Reading the flash while the hard drive is up and running, probably also isn't a good idea. You could desolder the flash chip, or try a stronger PSU, both ways have chances to break some- thing. Nico _______________________________________________ flashrom mailing list flashrom@flashrom.org https://mail.coreboot.org/mailman/listinfo/flashrom
