Kbuild in U-Boot has been talked about for a while and I know of at least one functioning attempt and mentions of independent progress. But I don't see any patches on the mailing list and various people have suggested that nothing is far advanced yet, so I decided to take a look.
For this effort, the goals are:
- Use Kbuild to build U-Boot, even if the existing CONFIG structure remains - Provide access to Kconfig infrastructure so we can migrate to it - Change as little U-Boot code as possible, particularly Makefiles
While some people regard U-Boot's config file approach as primitive, it is very flexible. In practice many Linux build systems use a 'defconfig' which is much the same thing, just without the comments. However, Kbuild/Kconfig does provide some advantages:
- 'make menuconfig' and friends, an easy way to browse/change configuration - More obvious information about configuration dependencies - Configuration help within the Kconfig files, rather than a separate README - The build prints the full path of each file built. Apart from the resulting clarity, this works nicely with IDEs/emacs which can open the correct file/line for each warning/error - Welcoming and familiar to those coming from Linux - Some other things
With respect to a migration path to full use of Kconfig for U-Boot, if that is desired, I suggest it can be done incrementally. The scheme in this series allows existing Makefiles to be used with only minor modification (to fix those which don't follow convention and add information about subdirectories). I think it is feasible to keep the config files and Kconfig running together for a time.
This series is a pretty early and raw attempt to get Kbuild running in U-Boot. I am not entirely comfortable with posting it, but decided that what was missing from previous efforts was posted patches, so here they are. A close review is not needed right now, but thoughts on the approach would be very valuable.
This series is missing all sorts of things, some of them critical (SPL, actual binary output, correct filename for 'u-boot' output, out-of-tree building). It will also pollute your tree with various files that you will need to manually remove afterwards.
But it does produce some sort of output for three boards (sandbox, seaboard, smdk5250).
To get a verbose build, try 'make V=1'. By default only the filenames and warnings/errors are printed.
To try it:
make sandbox_config make size vmlinux ./vmlinux
You can use the existing build system with:
make -f Makefile.legacy sandbox_config make -f Makefile.legacy size u-boot ./u-boot
If you omit the final patch, you can keep the existing build system in place and have the Kconfig one separate, in Makefile.kbuild, for use with 'make -f Makefile.kbuild'.
There is only one build option, and that isn't really an option, but to see it:
make menuconfig
or (perhaps preceeded by 'sudo apt-get install libqt4-dev g++'):
make xconfig
Simon Glass (7): Add some required Kconfig files arm: Allow start.o to come from any directory Tidy up Makefiles to use COBJS consistently Add Kconfig scripts and related material Adjust Kconfig scripts for use by U-Boot Enable Kconfig for U-Boot Switch over to Kbuild
.gitignore | 6 + Kconfig | 11 + Makefile | 2147 +++++++++++++++--------- Makefile.legacy | 900 ++++++++++ arch/Kconfig | 0 arch/arm/Kconfig | 0 arch/arm/Makefile | 20 + arch/arm/cpu/Makefile | 23 + arch/arm/cpu/armv7/Makefile | 11 +- arch/arm/cpu/armv7/s5p-common/Makefile | 3 +- arch/arm/cpu/tegra-common/Makefile | 5 +- arch/arm/cpu/tegra20-common/Makefile | 5 +- arch/arm/cpu/u-boot.lds | 2 +- arch/arm/lib/Makefile | 6 +- arch/sandbox/Kconfig | 8 + arch/sandbox/Makefile | 20 + arch/sandbox/cpu/Makefile | 2 + arch/sandbox/lib/Makefile | 4 + arch/x86/Kconfig | 0 arch/x86/Makefile | 24 + config.mk | 5 + doc/Makefile | 20 + drivers/Makefile | 47 + drivers/bios_emulator/Makefile | 4 + drivers/bootcount/Makefile | 2 +- drivers/fpga/Makefile | 2 +- drivers/gpio/Makefile | 1 - drivers/mtd/Makefile | 2 + drivers/mtd/nand/Makefile | 21 +- drivers/mtd/ubi/Makefile | 10 +- drivers/power/Makefile | 2 + drivers/usb/Makefile | 26 + drivers/usb/gadget/Makefile | 4 +- drivers/usb/musb-new/Makefile | 4 + fs/Makefile | 4 + fs/ext4/Makefile | 5 +- fs/fat/Makefile | 5 +- fs/sandbox/Makefile | 5 +- include/linux/kconfig.h | 46 + init/Makefile | 21 + init/main.c | 0 lib/Makefile | 3 + rules.mk | 25 + scripts/Kbuild.include | 278 +++ scripts/Makefile | 37 + scripts/Makefile.asm-generic | 24 + scripts/Makefile.autoconf | 68 + scripts/Makefile.build | 479 ++++++ scripts/Makefile.clean | 104 ++ scripts/Makefile.host | 170 ++ scripts/Makefile.lib | 380 +++++ scripts/Makefile.modpost | 148 ++ scripts/basic/.gitignore | 1 + scripts/basic/Makefile | 15 + scripts/basic/fixdep.c | 433 +++++ scripts/gcc-goto.sh | 21 + scripts/kconfig/.gitignore | 22 + scripts/kconfig/Makefile | 336 ++++ scripts/kconfig/POTFILES.in | 12 + scripts/kconfig/check.sh | 14 + scripts/kconfig/conf.c | 701 ++++++++ scripts/kconfig/confdata.c | 1164 +++++++++++++ scripts/kconfig/expr.c | 1168 +++++++++++++ scripts/kconfig/expr.h | 235 +++ scripts/kconfig/gconf.c | 1542 +++++++++++++++++ scripts/kconfig/gconf.glade | 661 ++++++++ scripts/kconfig/images.c | 326 ++++ scripts/kconfig/kxgettext.c | 235 +++ scripts/kconfig/list.h | 91 + scripts/kconfig/lkc.h | 198 +++ scripts/kconfig/lkc_proto.h | 56 + scripts/kconfig/lxdialog/.gitignore | 4 + scripts/kconfig/lxdialog/BIG.FAT.WARNING | 4 + scripts/kconfig/lxdialog/check-lxdialog.sh | 85 + scripts/kconfig/lxdialog/checklist.c | 332 ++++ scripts/kconfig/lxdialog/dialog.h | 236 +++ scripts/kconfig/lxdialog/inputbox.c | 301 ++++ scripts/kconfig/lxdialog/menubox.c | 436 +++++ scripts/kconfig/lxdialog/textbox.c | 408 +++++ scripts/kconfig/lxdialog/util.c | 664 ++++++++ scripts/kconfig/lxdialog/yesno.c | 114 ++ scripts/kconfig/mconf.c | 963 +++++++++++ scripts/kconfig/menu.c | 644 +++++++ scripts/kconfig/merge_config.sh | 142 ++ scripts/kconfig/nconf.c | 1558 +++++++++++++++++ scripts/kconfig/nconf.gui.c | 654 ++++++++ scripts/kconfig/nconf.h | 96 ++ scripts/kconfig/qconf.cc | 1790 ++++++++++++++++++++ scripts/kconfig/qconf.h | 337 ++++ scripts/kconfig/streamline_config.pl | 634 +++++++ scripts/kconfig/symbol.c | 1310 +++++++++++++++ scripts/kconfig/util.c | 159 ++ scripts/kconfig/zconf.gperf | 47 + scripts/kconfig/zconf.hash.c_shipped | 286 ++++ scripts/kconfig/zconf.l | 364 ++++ scripts/kconfig/zconf.lex.c_shipped | 2420 +++++++++++++++++++++++++++ scripts/kconfig/zconf.tab.c_shipped | 2504 ++++++++++++++++++++++++++++ scripts/kconfig/zconf.y | 740 ++++++++ scripts/link-vmlinux.sh | 227 +++ scripts/mkcompile_h | 100 ++ scripts/mksysmap | 45 + scripts/mod/.gitignore | 5 + scripts/mod/Makefile | 51 + scripts/mod/devicetable-offsets.c | 178 ++ scripts/mod/empty.c | 1 + scripts/mod/file2alias.c | 1236 ++++++++++++++ scripts/mod/mk_elfconfig.c | 57 + scripts/mod/modpost.c | 2222 ++++++++++++++++++++++++ scripts/mod/modpost.h | 187 +++ scripts/mod/sumversion.c | 519 ++++++ scripts/setlocalversion | 176 ++ 111 files changed, 33813 insertions(+), 803 deletions(-) create mode 100644 Kconfig create mode 100644 Makefile.legacy create mode 100644 arch/Kconfig create mode 100644 arch/arm/Kconfig create mode 100644 arch/arm/Makefile create mode 100644 arch/arm/cpu/Makefile create mode 100644 arch/sandbox/Kconfig create mode 100644 arch/sandbox/Makefile create mode 100644 arch/x86/Kconfig create mode 100644 arch/x86/Makefile create mode 100644 doc/Makefile create mode 100644 drivers/Makefile create mode 100644 drivers/usb/Makefile create mode 100644 include/linux/kconfig.h create mode 100644 init/Makefile create mode 100644 init/main.c create mode 100644 scripts/Kbuild.include create mode 100644 scripts/Makefile create mode 100644 scripts/Makefile.asm-generic create mode 100644 scripts/Makefile.autoconf create mode 100644 scripts/Makefile.build create mode 100644 scripts/Makefile.clean create mode 100644 scripts/Makefile.host create mode 100644 scripts/Makefile.lib create mode 100644 scripts/Makefile.modpost create mode 100644 scripts/basic/.gitignore create mode 100644 scripts/basic/Makefile create mode 100644 scripts/basic/fixdep.c create mode 100644 scripts/gcc-goto.sh create mode 100644 scripts/kconfig/.gitignore create mode 100644 scripts/kconfig/Makefile create mode 100644 scripts/kconfig/POTFILES.in create mode 100755 scripts/kconfig/check.sh create mode 100644 scripts/kconfig/conf.c create mode 100644 scripts/kconfig/confdata.c create mode 100644 scripts/kconfig/expr.c create mode 100644 scripts/kconfig/expr.h create mode 100644 scripts/kconfig/gconf.c create mode 100644 scripts/kconfig/gconf.glade create mode 100644 scripts/kconfig/images.c create mode 100644 scripts/kconfig/kxgettext.c create mode 100644 scripts/kconfig/list.h create mode 100644 scripts/kconfig/lkc.h create mode 100644 scripts/kconfig/lkc_proto.h create mode 100644 scripts/kconfig/lxdialog/.gitignore create mode 100644 scripts/kconfig/lxdialog/BIG.FAT.WARNING create mode 100644 scripts/kconfig/lxdialog/check-lxdialog.sh create mode 100644 scripts/kconfig/lxdialog/checklist.c create mode 100644 scripts/kconfig/lxdialog/dialog.h create mode 100644 scripts/kconfig/lxdialog/inputbox.c create mode 100644 scripts/kconfig/lxdialog/menubox.c create mode 100644 scripts/kconfig/lxdialog/textbox.c create mode 100644 scripts/kconfig/lxdialog/util.c create mode 100644 scripts/kconfig/lxdialog/yesno.c create mode 100644 scripts/kconfig/mconf.c create mode 100644 scripts/kconfig/menu.c create mode 100755 scripts/kconfig/merge_config.sh create mode 100644 scripts/kconfig/nconf.c create mode 100644 scripts/kconfig/nconf.gui.c create mode 100644 scripts/kconfig/nconf.h create mode 100644 scripts/kconfig/qconf.cc create mode 100644 scripts/kconfig/qconf.h create mode 100644 scripts/kconfig/streamline_config.pl create mode 100644 scripts/kconfig/symbol.c create mode 100644 scripts/kconfig/util.c create mode 100644 scripts/kconfig/zconf.gperf create mode 100644 scripts/kconfig/zconf.hash.c_shipped create mode 100644 scripts/kconfig/zconf.l create mode 100644 scripts/kconfig/zconf.lex.c_shipped create mode 100644 scripts/kconfig/zconf.tab.c_shipped create mode 100644 scripts/kconfig/zconf.y create mode 100644 scripts/link-vmlinux.sh create mode 100755 scripts/mkcompile_h create mode 100644 scripts/mksysmap create mode 100644 scripts/mod/.gitignore create mode 100644 scripts/mod/Makefile create mode 100644 scripts/mod/devicetable-offsets.c create mode 100644 scripts/mod/empty.c create mode 100644 scripts/mod/file2alias.c create mode 100644 scripts/mod/mk_elfconfig.c create mode 100644 scripts/mod/modpost.c create mode 100644 scripts/mod/modpost.h create mode 100644 scripts/mod/sumversion.c create mode 100755 scripts/setlocalversion