Broadcom FlexRM Mailbox

modulename: bcm-flexrm-mailbox.ko

configname: CONFIG_BCM_FLEXRM_MBOX

Linux Kernel Configuration
└─>Device Drivers
└─>Mailbox Hardware Support
└─>Broadcom FlexRM Mailbox
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Mailbox implementation of the Broadcom FlexRM ring manager,
which provides access to various offload engines on Broadcom
SoCs. Say Y here if you want to use the Broadcom FlexRM.

source code:
selects
CONFIG_GENERIC_MSI_IRQ_DOMAIN