SPI NOR w25q128 "flash operation timed out"

["Klotz, Oliver" <Oliver.Klotz@knorr-bremse.com>]

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.

Although the device is properly detected as “m25p80 m25p80@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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