CONFIG_OMAP_MBOX_FWK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Mailbox framework support
modulename: mailbox_mach.ko
and/ormailbox.ko
configname: CONFIG_OMAP_MBOX_FWK
Linux Kernel Configuration
└─>TI OMAP Implementations
└─>Mailbox framework support
In linux kernel since version 2.6.30 (release Date: 2009-06-09)
Say Y here if you want to use OMAP Mailbox framework support for
DSP, IVA1.0 and IVA2 in OMAP1/2/3.
DSP, IVA1.0 and IVA2 in OMAP1/2/3.