W25Q256JVFQ

[Andrej Gornik]

Hi,

I have problem with flashing W25Q256JVFQwith latest git version of flashrom.

root/Temp/flashrom/flashrom -p buspirate_spi:dev=/dev/ttyACM0 -c 
W25Q256.V -w Upall_VTH52X1D.20180622.bin
flashrom p1.0-100-gcabe320 on Linux 4.14.0-kali3-amd64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Bus Pirate firmware 6.1 and older does not support SPI speeds above 2 
MHz. Limiting speed to 2 MHz.
It is recommended to upgrade to firmware 6.2 or newer.
Found Winbond flash chip "W25Q256.V" (32768 kB, SPI) on buspirate_spi.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to [e-mail] if any of the above 
operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and 
mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading old flash chip contents...  done.
Erasing and writing flash chip... FAILED at 0x0025d000! Expected=0xff, 
Found=0xf0, failed byte count from 0x0025d000-0x0025dfff: 0x31b
ERASE FAILED!
Reading current flash chip contents...  done. Looking for another erase 
function.
FAILED at 0x006dc800! Expected=0xff, Found=0x48, failed byte count from 
0x006d8000-0x006dffff: 0x2a7
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase 
function.
Erase/write done.
Verifying flash... FAILED at 0x002bbe59! Expected=0x3b, Found=0x00, 
failed byte count from 0x00000000-0x01ffffff: 0xa114
Your flash chip is in an unknown state.
Please report this on IRC at chat.freenode.net (channel #flashrom) or
mail [e-mail], thanks!

Regards,

Andrej

[Nico Huber]

Hello Andrej,

On 9/23/18 4:11 PM, Andrej Gornik wrote:
> I have problem with flashing W25Q256JVFQwith latest git version of
> flashrom.
> [...]
> Erasing and writing flash chip... FAILED at 0x0025d000! Expected=0xff,
> Found=0xf0, failed byte count from 0x0025d000-0x0025dfff: 0x31b
> ERASE FAILED!
> Reading current flash chip contents...  done. Looking for another erase
> function.
> FAILED at 0x006dc800! Expected=0xff, Found=0x48, failed byte count from
> 0x006d8000-0x006dffff: 0x2a7
> ERASE FAILED!
> Reading current flash chip contents... done. Looking for another erase
> function.
> Erase/write done.
> Verifying flash... FAILED at 0x002bbe59! Expected=0x3b, Found=0x00,
> failed byte count from 0x00000000-0x01ffffff: 0xa114

As it fails at different locations, the problem seems to be arbitrarily
failing reads (flashrom has to read to verify that an erase succeeded).
You should try to read the whole chip and verify (flashrom -v) the
result multiple times. Only if the physical setup is good enough for
valid reads, flashrom can work reliably.

You can also try to reduce the `spispeed` (see manpage) to mitigate a
bad connection. But as the chosen speed (2MHz) is already rather low,
I would check the wiring (wires shouldn't be too long, see also [1][2]).

Hope that helps,
Nico

[1] https://flashrom.org/ISP
[2] https://flashrom.org/Common_problems