CONFIG_ZBOOT_ROM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Compressed boot loader in ROM/flash
configname: CONFIG_ZBOOT_ROM
Linux Kernel Configuration
└─>Boot options
└─>Compressed boot loader in ROM/flash
In linux kernel since version 2.6.12
Say Y here if you intend to execute your compressed kernel image
(zImage) directly from ROM or flash. If unsure, say N.
(zImage) directly from ROM or flash. If unsure, say N.