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Until commit "arch/Config.in.sh: fixup MMU selection" in this series, SH2A could either be used with BR2_USE_MMU disabled or BR2_USE_MMU enabled. The later made absolutely no sense, since SH2A does not have a MMU: MMU support was introduced starting from SH3 according to https://en.wikipedia.org/wiki/SuperH#SH-3 Also, since commit22d5501e03("arch: tidy up binary formats config"), which was merged in Buildroot 2015.05, the architecture tuple used when BR2_sh2a=y and BR2_USE_MMU disabled is sh2a-buildroot-uclinux-uclibc, and this was already unsupported back in the days of Buildroot 2015.08 and binutils 2.24, causing the build to fail with: *** BFD does not support target sh2a-buildroot-uclinux-uclibc. just like it fails to build today with recent version of binutils. So, this has been broken since 2015.08, and nobody complained. SH2A is seldom used, so it's time to kill it. It is worth mentioning that there had been an attempt at resurrecting SH2 support around 2015 (see https://lwn.net/Articles/647636/) as part of the J2 core. This effort led to the addition of FDPIC support for SH2A in the musl C library (and therefore proper ELF binaries, with shared libraries), but that was never supported in Buildroot. Now that the J2 project is essentially dead, there is no reason to bother with this. Fixes: http://autobuild.buildroot.net/results/63d01d33ae30f86b63b9f42a9fea116f2f3e9005/ Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commit04ea3d38dd) 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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches