Physical start address of flash mapping

configname: CONFIG_MTD_PHYSMAP_START

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Mapping drivers for chip access
└─>Physical start address of flash mapping
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This is the physical memory location at which the flash chips
are mapped on your particular target board. Refer to the
memory map which should hopefully be in the documentation for
your board.