ARM Cortex-M support and STM32 defconfigs

Hello,

Here is the v2 of the patches that add support for ARM Cortex-M and STM32 defconfigs.

The changes from v1 are:

- Added Arnout Acked-by on patch "arch/arm: introduce and use BR2_ARM_CPU_ARMV7M".

- Added Arnout Reviewed-by on patch "arch/arm: add Cortex-M4 entry"

- Replace the complicated COMPILE_IN_THUMB/USE_BX logic in uclibc.mk by patches against uClibc-ng that allow to completely get rid of those options. Then simplified uclibc.mk accordingly.

- Remove hard-float suport for now, since there is no support for it in the kernel. Suggested by Arnout.

- Use BR2_BINFMT_FLAT instead of BR2_USE_MMU to decide whether to disable DOPIC in uClibc. Suggested by Arnout.

- Fix typo in DOPIC commit log. Noticed by Arnout.

- Added Arnout Reviewed-by on patch "uclibc: NPTL thread implementation only available on MMU platforms".

- In the patch that ensures musl is built for the ARM instruction set when Thumb1 is selected, clarify the comment. Suggested by Arnout.

- Added Arnout Reviewed-by on package/Makefile.in: adjust LDFLAGS for elf2flt.

- Add hash file to the elf2flt package. Suggested by Arnout.

- Improve the elf2flt upstream change commit log, to explain more clearly why the patch from Waldemar is included in this commit. Done after a comment made by Arnout.

- Merge the elf2flt --disable-werror into the elf2flt upstream change patch, since it's actually related (switching upstream has changed the source code, which is the reason for the new warnings that cause the build issues).

- Switch to kernel 4.5 for the STM32 defconfigs

- Regenerate Linux patches for STM32F469 since they were not applying correctly (reported by Maxime Coquelin).

Thanks!

Thomas

Lee Jones (2):
configs/stm32f429_disco: new configuration for STM32F429 Discovery
board
configs/stm32f469_disco: new configuration for STM32F469 Discovery
board

Thomas Petazzoni (15):
arch/arm: introduce and use BR2_ARM_CPU_ARMV7M arch/arm: Cortex-M3 provides only Thumb-2
arch/arm: add Cortex-M4 entry
uclibc: add patches to simplify Thumb handling
uclibc: remove USE_BX handling
uclibc: gcc >= 4.9 can build a thumb/thread uclibc
uclibc: disable DOPIC on ARM FLAT
uclibc: context functions are not Thumb-compatible
uclibc: NPTL thread implementation only available on MMU platforms
musl: build broken on Thumb, use ARM mode
toolchain-buildroot: update glibc comment for noMMU
toolchain-buildroot: don't show musl on noMMU platforms package/Makefile.in: adjust LDFLAGS for elf2flt
elf2flt: use new upstream site and add ARM patch
afboot-stm32: use the Buildroot toolchain

 arch/Config.in.arm                                 |   10 +-
 board/stmicroelectronics/busybox-minimal.config    | 1057 ++++++++++++++++++++
 board/stmicroelectronics/stm32-post-build.sh       |    8 +
 board/stmicroelectronics/stm32f429-disco/flash.sh  |   20 +
 ...49-disco-don-t-force-init-in-chosen-boota.patch |   32 +
 .../stmicroelectronics/stm32f429-disco/readme.txt  |   30 +
 board/stmicroelectronics/stm32f469-disco/flash.sh  |   20 +
 ...-ARM-stm32-Identify-a-new-board-STM32F469.patch |   25 +
 ...upply-a-DTS-file-for-the-STM32F469-Discov.patch |  101 ++
 ...-Add-new-config-fragment-to-change-RAM-st.patch |   28 +
 .../patches/openocd/0001-add-config.patch          |   37 +
 .../patches/openocd/0002-flash-nor.patch           |   37 +
 .../stmicroelectronics/stm32f469-disco/readme.txt  |   19 +
 .../0001-Use-ld-instead-of-gcc-for-linking.patch   |   61 ++
 boot/afboot-stm32/afboot-stm32.mk                  |    2 +-
 configs/stm32f429_disco_defconfig                  |   18 +
 configs/stm32f469_disco_defconfig                  |   19 +
 package/Makefile.in                                |    2 +-
 .../0001-allow-to-build-arm-flat-binaries.patch    |  123 +++
 package/elf2flt/elf2flt.hash                       |    2 +
 package/elf2flt/elf2flt.mk                         |    8 +-
 package/musl/musl.mk                               |    6 +
 .../0001-arm-remove-use-of-USE_BX-option.patch     |   53 +
 package/uclibc/0002-arm-remove-USE_BX-option.patch |   40 +
 .../0003-arm-remove-use-of-USE_LDREXSTREX.patch    |   49 +
 .../uclibc/0004-arm-remove-USE_LDREXSTREX.patch    |   34 +
 .../uclibc/0005-arm-remove-COMPILE_IN_THUMB.patch  |   43 +
 package/uclibc/Config.in                           |    7 +-
 package/uclibc/uclibc.mk                           |   23 +-
 toolchain/toolchain-buildroot/Config.in            |    4 +
 30 files changed, 1897 insertions(+), 21 deletions(-)
 create mode 100644 board/stmicroelectronics/busybox-minimal.config
 create mode 100755 board/stmicroelectronics/stm32-post-build.sh
 create mode 100755 board/stmicroelectronics/stm32f429-disco/flash.sh
 create mode 100644 board/stmicroelectronics/stm32f429-disco/patches/linux/0001-ARM-stm32f249-disco-don-t-force-init-in-chosen-boota.patch
 create mode 100644 board/stmicroelectronics/stm32f429-disco/readme.txt
 create mode 100755 board/stmicroelectronics/stm32f469-disco/flash.sh
 create mode 100644 board/stmicroelectronics/stm32f469-disco/patches/linux/0001-ARM-stm32-Identify-a-new-board-STM32F469.patch
 create mode 100644 board/stmicroelectronics/stm32f469-disco/patches/linux/0002-ARM-stm32-Supply-a-DTS-file-for-the-STM32F469-Discov.patch
 create mode 100644 board/stmicroelectronics/stm32f469-disco/patches/linux/0003-ARM-configs-Add-new-config-fragment-to-change-RAM-st.patch
 create mode 100644 board/stmicroelectronics/stm32f469-disco/patches/openocd/0001-add-config.patch
 create mode 100644 board/stmicroelectronics/stm32f469-disco/patches/openocd/0002-flash-nor.patch
 create mode 100644 board/stmicroelectronics/stm32f469-disco/readme.txt
 create mode 100644 boot/afboot-stm32/0001-Use-ld-instead-of-gcc-for-linking.patch
 create mode 100644 configs/stm32f429_disco_defconfig

 create mode 100644 configs/stm32f469_disco_defconfig
 create mode 100644 package/elf2flt/0001-allow-to-build-arm-flat-binaries.patch
 create mode 100644 package/elf2flt/elf2flt.hash
 create mode 100644 package/uclibc/0001-arm-remove-use-of-USE_BX-option.patch
 create mode 100644 package/uclibc/0002-arm-remove-USE_BX-option.patch
 create mode 100644 package/uclibc/0003-arm-remove-use-of-USE_LDREXSTREX.patch
 create mode 100644 package/uclibc/0004-arm-remove-USE_LDREXSTREX.patch
 create mode 100644 package/uclibc/0005-arm-remove-COMPILE_IN_THUMB.patch