CONFIG_EMBEDDEDBOOT is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

CONFIG_EMBEDDEDBOOT (not configurable)

configname: CONFIG_EMBEDDEDBOOT

Linux/PowerPC Kernel Configuration
└─>Platform options
└─>EMBEDDEDBOOT
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
depends
CONFIG_8260 or CONFIG_8xx or CONFIG_4xx