Hello Luca,
On 05.03.2018 19:33, Luca Bacci Bonotti wrote:
Hi I need help with flashrom . I'm unable to write a firmware using CH341A programmer, test clip pomona 5252 .
flashing in-system (ISP) is sometimes a very delicate procedure. How and if it will work, depends on many things: 1. is the board designed for ISP; if, follow the manual; if not 2. how do you power the flash chip? through the board's regular power supply (strongly advised)? or through the ch341a (discouraged unless you know exactly what you are doing)? 3. are all input pins of the flash chip in a defined state? (e.g. don't forget /HOLD and /WP). See also [1] and [2].
The EEPRom I'm trying to write is S25FL128SAGMFI000.
Regarding ISP, the board the chip is soldered to matters more than the chip. What board is it?
Hope that helps, Nico
[1] https://flashrom.org/ISP [2] https://flashrom.org/Common_problems
I tried with chip soldered and unsoldered. Same results.
The board is a router samknows SK-WB8 I erased uboot. Now samknows support sent me a bin file and I'm trying to write this I attach some images.
I have a bunch of spare chips to try.
The connections to the chip are made following this https://n0wblog.blogspot.it/2017/04/dumping-flash-memory-over-spi.html
I previously tried programming with raspberry PI but it was unable to see my chip. I have both CH341A and Raspberry Pi.
When I tried with PI i followed this
https://blackboxhacking.blogspot.it/2015/08/dump-de-memoire-flash-spi-avec.h...
Where should i connect /HOLD /WP on the CH341A ?
Do you have a schematics I can follow ?
Thanks a lot
Luca
Il 5 mar 2018 21:56, "Nico Huber" nico.h@gmx.de ha scritto:
Hello Luca,
On 05.03.2018 19:33, Luca Bacci Bonotti wrote:
Hi I need help with flashrom . I'm unable to write a firmware using CH341A programmer, test clip pomona 5252 .
flashing in-system (ISP) is sometimes a very delicate procedure. How and if it will work, depends on many things: 1. is the board designed for ISP; if, follow the manual; if not 2. how do you power the flash chip? through the board's regular power supply (strongly advised)? or through the ch341a (discouraged unless you know exactly what you are doing)? 3. are all input pins of the flash chip in a defined state? (e.g. don't forget /HOLD and /WP). See also [1] and [2].
The EEPRom I'm trying to write is S25FL128SAGMFI000.
Regarding ISP, the board the chip is soldered to matters more than the chip. What board is it?
Hope that helps, Nico
[1] https://flashrom.org/ISP [2] https://flashrom.org/Common_problems
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Luca Bacci Bonotti -
Nico Huber