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