Thank you! I swapped out my phone charger for my iPad's wall wart to power the raspberry pi, and I did some power-saving stuff like installing raspbian lite, disabling LEDs and radios, and accessing the pi via SSH rather than a monitor and HDMI. And it worked! The drive seems to be functioning perfectly fine even after doing some reads/writes on the chip.
On Tue, Mar 6, 2018 at 3:42 PM, Nico Huber <nic...@gmx.de> wrote: > 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 >
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