default or selected kernelversion does not have config value CONFIG_FB_SH_MOBILE_MERAM.
Result is shown for kernelversion 6.7-rc3

SuperH Mobile MERAM read ahead support

modulename: sh_mobile_meram.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>SuperH Mobile MERAM read ahead support
In linux kernel since version 3 (release Date: 2011-07-21)  
Enable MERAM support for the SuperH controller.

This will allow for caching of the framebuffer to provide more
reliable access under heavy main memory bus traffic situations.
Up to 4 memory channels can be configured, allowing 4 RGB or
2 YCbCr framebuffers to be configured.

source code: