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The 64 bits ARM processors are capable of running 32 bits ARM code, and some platforms are indeed using this capability. Due to this, if we were to keep the separation between Config.in.aarch64 and Config.in.arm, we would have to duplicate the definition of all 64-bits capable ARM cores into both files. Instead of going down this route, let's take the same route as the x86 one: a single Config.in.x86 file, used for both x86 32 bits and x86 64 bits, with the appropriate logic to only show the relevant cores depending on which architecture is selected. In order to do this, we: - Make the "ARM instruction set" choice only visible on ARM 32 bits, since we currently don't support ARM vs. Thumb on AArch64. - Add the relevant values for the BR2_ARCH option. - Add the relevant values for the BR2_ENDIAN option. - Make the "aapcs-linux" BR2_GCC_TARGET_ABI value only used on ARM 32 bits, since this ABI doesn't mean anything on AArch64. - Make the BR2_GCC_TARGET_FPU option depends on ARM 32 bits, since there is no -mfpu option on AArch64. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.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