|
|
|
|
Trusted Firmware-A for Allwinner ARMv8 SoCs
|
|
|
|
|
===========================================
|
|
|
|
|
|
|
|
|
|
Trusted Firmware-A (TF-A) implements the EL3 firmware layer for Allwinner
|
|
|
|
|
SoCs with ARMv8 cores. Only BL31 is used to provide proper EL3 setup and
|
|
|
|
|
PSCI runtime services.
|
|
|
|
|
|
|
|
|
|
U-Boot's SPL acts as a loader, loading both BL31 and BL33 (typically U-Boot).
|
|
|
|
|
Loading is done from SD card, eMMC or SPI flash, also via an USB debug
|
|
|
|
|
interface (FEL).
|
|
|
|
|
|
|
|
|
|
BL31 lives in SRAM A2, which is documented to be accessible from secure
|
|
|
|
|
world only.
|
|
|
|
|
|
|
|
|
|
Current limitations:
|
|
|
|
|
|
|
|
|
|
- Missing PMIC support
|
|
|
|
|
|
|
|
|
|
After building bl31.bin, the binary must be fed to the U-Boot build system
|
|
|
|
|
to include it in the FIT image that the SPL loader will process.
|
|
|
|
|
bl31.bin can be either copied (or sym-linked) into U-Boot's root directory,
|
|
|
|
|
or the environment variable BL31 must contain the binary's path.
|
|
|
|
|
See the respective `U-Boot documentation`_ for more details.
|
|
|
|
|
|
|
|
|
|
To build for machines with an A64 or H5 SoC:
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
make CROSS_COMPILE=aarch64-linux-gnu- PLAT=sun50i_a64 DEBUG=1 bl31
|
|
|
|
|
|
|
|
|
|
To build for machines with an H6 SoC:
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
make CROSS_COMPILE=aarch64-linux-gnu- PLAT=sun50i_h6 DEBUG=1 bl31
|
|
|
|
|
|
|
|
|
|
.. _U-Boot documentation: http://git.denx.de/?p=u-boot.git;f=board/sunxi/README.sunxi64;hb=HEAD
|
|
|
|
|
|
|
|
|
|
Trusted OS dispatcher
|
|
|
|
|
=====================
|
|
|
|
|
|
|
|
|
|
One can boot Trusted OS(OP-TEE OS, bl32 image) along side bl31 image on Allwinner A64.
|
|
|
|
|
|
|
|
|
|
In order to include the 'opteed' dispatcher in the image, pass 'SPD=opteed' on the command line
|
|
|
|
|
while compiling the bl31 image and make sure the loader (SPL) loads the Trusted OS binary to
|
|
|
|
|
the beginning of DRAM (0x40000000).
|
|
|
|
|
|
