SPI NOR w25q128 "flash operation timed out"

[Ahmad Fatoum]

Hello Oliver,

On 17.02.23 09:22, Klotz, Oliver wrote:
> Hello,
> 
> I am using an am335x based SOM with SPI NOR flash.
> Recently the SOM vendor replaced Micron n25q128a13 with Winbond w25q128.
> 
> Winbond works fine with barebox-2016.07.0, but fails with barebox-2023.01.0, barebox-2022.09.0, barebox-2021.07.0.

Can you use git bisect to narrow down the commit that caused the regression?

Cheers,
Ahmad

> 
> Although the device is properly detected as “m25p80 m25p80 at 00: w25q128 (16384 Kbytes)” – INFO(0xef4018).
> erase and mw commands end in "flash operation timed out".
> 
> I tried w/wo CONFIG_MTD_SPI_NOR_USE_4K_SECTORS and with 24/48MHz SPI clock.
> 
> I have added some trace messages for read_sr() and run “erase /dev/m25p0.bareboxenv” (partition size = 128 Kbytes, sector size = 64 Kbytes)
> 
> read_sr() returns 0x00 0x03 0x03 0x03 0x03 0x03 0x03 and then it is stuck to 0xff and this is causing the timeout.
> 
> When running the same binary on the Micron-SOM then I get 0x00, a bunch of 0x03, 0x00, a bunch of 0x03 and finally 0x00 as expected for erasing 2 sectors.
> 
> 
> Is anyone facing similar issue with w25q128?
> 
> Any idea what might be the problem here?
> 
> 
> Thanks and best Regards
> 
> Oliver Klotz
> 
> 
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