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Some ARM64 platforms (such as Allwinner A64/H5) have a boot process where U-Boot encapsulates the BL31 part of the ARM trusted firmware. For such platforms, we need to build ATF before U-Boot, and pass a BL31 variable pointing to ATF bl31.bin to the U-Boot build process. This commit introduces a BR2_TARGET_UBOOT_NEEDS_ATF_BL31 variable to achieve this. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> [Thomas: - Rename option to BR2_TARGET_UBOOT_NEEDS_ATF_BL31 - Drop changes to arm-trusted-firmware.mk, they are taken care of by previous commits. - Improve Config.in help text - Add missing dependency on arm-trusted-firmware when BR2_TARGET_UBOOT_NEEDS_ATF_BL31 is enabled. - Use bl31.bin from $(BINARIES_DIR) instead of taking it from ATF's build dir.] [Peter: depend on toplevel atf option and select bl31 option. Ensure it cannot be enabled together with ARM_TRUSTED_FIRMWARE_UBOOT_AS_BL33 as that would cause circular dependencies] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Jagan Teki <jagan@amarulasolutions.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches