1# SPDX-License-Identifier: GPL-2.0
2
3config ARM_FFA_TRANSPORT
4	bool "Enable Arm Firmware Framework for Armv8-A driver"
5	depends on DM && (ARM64 || SANDBOX)
6	select ARM_SMCCC if !SANDBOX
7	select ARM_SMCCC_FEATURES if !SANDBOX
8	imply CMD_ARMFFA
9	select LIB_UUID
10	select DEVRES
11	help
12	  The Firmware Framework for Arm A-profile processors (FF-A)
13	  describes interfaces (ABIs) that standardize communication
14	  between the Secure World and Normal World leveraging TrustZone
15	  technology.
16
17	  The FF-A support in U-Boot is based on FF-A specification v1.0 and uses SMC32
18	  calling convention.
19
20	  FF-A specification:
21
22	  https://developer.arm.com/documentation/den0077/a/?lang=en
23
24	  In U-Boot FF-A design, FF-A is considered as a discoverable bus.
25	  FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed
26	  by the PSCI driver.
27	  The Secure World is considered as one entity to communicate with
28	  using the FF-A bus.
29	  FF-A communication is handled by one device and one instance (the bus).
30	  The FF-A support on U-Boot  takes care of all the interactions between Normal
31	  world and Secure World.
32
33	  Generic FF-A methods are implemented in the Uclass (arm-ffa-uclass.c).
34	  Arm specific methods are implemented in the Arm driver (arm-ffa.c).
35
36	  FF-A sandbox is provided to run FF-A under sandbox and allows to test the FF-A Uclass.
37	  Sandbox support includes an emulator for Arm FF-A which emulates the FF-A side of
38	  the Secure World and provides FF-A ABIs inspection methods (ffa-emul-uclass.c).
39	  An FF-A sandbox driver is also provided for FF-A communication with the emulated
40	  Secure World (sandbox_ffa.c).
41
42	  For more details about the FF-A support, please refer to doc/arch/arm64.ffa.rst
43