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This commit is based on earlier work from Łukasz Stelmach <l.stelmach@samsung.com> to add support for different page sizes on ARM64. In his initial submission, Łukasz took an approach similar to this one, i.e make it ARM64-specific. Following the feedback on the mailing list, his second version [1] tried to generalize the logic to configure the page size between architectures. But the general consensus during the review process was that there wasn't much to generalize in the end. So, this new iteration is back to a simpler approach: * We have new options in Config.in.arm to configure the page size. Only 4 KB and 64 KB are supported, because our testing in Qemu and real hardware has not allowed to get a successful setup for 16 KB pages. We can always re-add support for 16 KB later if that is resolved. * The logic to define the ARCH_TOOLCHAIN_WRAPPER_OPTS options is moved from the ARC-specific file to arch/arch.mk, and extended to cover ARM64. * The appropriate logic in uclibc.mk and linux.mk is added to tweak the relevant configuration options. * A test case is added in the runtime test infrastructure to test building and booting under Qemu a 64 KB configuration, with all 3 C libraries. For the regular configuration of 4 KB pages, this commit makes one functional change: on ARM64, -Wl,-z,max-page-size=4096 is now passed in the compiler flags of the wrapper. [1] https://patchwork.ozlabs.org/project/buildroot/list/?series=275452 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches