[flashrom] Problem while erasing chip prior write bin file.

Luca Bacci Bonotti luca.baccibonotti at gmail.com
Tue Mar 6 22:13:54 CET 2018

In your opinion is better the raspberry pi or ch341a to reach my goal?

Should I buy a breadboard for create better connections ?

Can you draw a schematic that I can follow?

Il 6 mar 2018 21:55, "Nico Huber" <nico.h at gmx.de> ha scritto:

> Hello Luca,
> On 06.03.2018 07:25, Luca Bacci Bonotti wrote:
> > I tried with chip soldered and unsoldered. Same results.
> same results? probably due to very different problems. Especially when
> the chip is not part of a circuitry (that might already take care), you
> have to connect all input pins of the chip. Also, very often, a series
> resistor at least on the MISO output is required.
> > I previously tried programming with raspberry PI but it was unable to see
> > my chip.
> > I have both CH341A and Raspberry Pi.
> When you use the Raspberry Pi, make sure you set the `spispeed` parame-
> ter of linux_spi to something reasonable (I'd start trying around 1000,
> i.e. 1MHz), the default is OS dependent and often not reliable.
> > Where should i connect /HOLD /WP on the CH341A ?
> /HOLD should be pulled up towards VCC (i.e. using a series resistor,
> 10kOhm maybe), state of /WP usually only matters when the chip has some
> write-protection set up, so either pull up towards VCC or down towards
> GND (if in doubt, up).
> Nico
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