default or selected kernelversion does not have config value CONFIG_M25PXX_USE_FAST_READ.
Result is shown for kernelversion 6.2.5
Use FAST_READ OPCode allowing SPI CLK <= 50MHz
configname: CONFIG_M25PXX_USE_FAST_READ
Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Self-contained MTD device drivers
└─>Use FAST_READ OPCode allowing SPI CLK <= 50MHz
In linux kernel since version 2.6.26 (release Date: 2008-07-13)
This option enables FAST_READ access supported by ST M25Pxx.