diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/plat/allwinner.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/docs/plat/allwinner.rst b/docs/plat/allwinner.rst new file mode 100644 index 000000000..a7e84a304 --- /dev/null +++ b/docs/plat/allwinner.rst @@ -0,0 +1,29 @@ +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: + +:: + + make CROSS_COMPILE=aarch64-linux-gnu- PLAT=sun50i_a64 DEBUG=1 bl31 + +.. _U-Boot documentation: http://git.denx.de/?p=u-boot.git;f=board/sunxi/README.sunxi64;hb=HEAD |