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This commit adds a number of patches to uClibc that radically simplifies the Thumb handling. uClibc currently has three options that you need to toggle on Thumb configurations depending on the specific ARM CPU being targeted. However, it turns out that none of those options are necessary: - USE_BX can simply be guessed by looking at the ARM core being used. The bx instruction is available for all ARM cores >= ARMv4T. This is exactly what glibc is doing. - USE_LDREXSTREX can also be guessed by looking at the ARM core being used: whenever you have Thumb2, ldrex/strex is available. - COMPILE_IN_THUMB becomes useless, since all it does is passing -mthumb. But just like the uClibc config options to set --march=<foo> have been removed a long time ago, there's no need to -have an option to pass -mthumb. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> 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