since it is broken and inefficient, and then removed by:
commit dc961baaea
Author: chao.an <anchao@xiaomi.com>
Date: Thu Apr 14 18:07:14 2022 +0800
arm/armv7-[a|r]: move fpu save/restore to assembly handler
Save/Restore FPU registers in C environment is dangerous practive,
which cannot guarantee the compiler won't generate the assembly code
with float point registers, especially in interrupt handling
Signed-off-by: chao.an <anchao@xiaomi.com>
commit 8d66dbc068
Author: chao.an <anchao@xiaomi.com>
Date: Thu Apr 7 13:48:04 2022 +0800
arm/armv[7|8]-m: skip the fpu save/restore if stack frame is integer-only
Signed-off-by: chao.an <anchao@xiaomi.com>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
1.Reduce the default size of task_group_s(~512B each task)
2.Scale better between simple and complex application
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ia872137504fddcf64d89c48d6f0593d76d582710
Add support for the STM32G474 family of microcontrollers and the
B-G474E-DPOW1 Discovery Board, which features a STM32G474RET6.
This is a major pull request as it adds support for an entirely
new family of STM32. This support is implemented in
arch/arm/src/stm32 and shares implementation with other STM32
families supported by that code, such as the 'L15xx, 'F10xx,
'F20xx, 'F3xxx, and 'F4xxx.
boards/Kconfig:
* Make NuttX recognize the existence of b-g474e-dpow1,
the B-G474E-DPOW1 Discovery Board.
boards/arm/stm32/b-g474e-dpow1/Kconfig:
boards/arm/stm32/b-g474e-dpow1/README.txt:
boards/arm/stm32/b-g474e-dpow1/configs/nsh/defconfig:
boards/arm/stm32/b-g474e-dpow1/include/board.h:
boards/arm/stm32/b-g474e-dpow1/scripts/Make.defs:
boards/arm/stm32/b-g474e-dpow1/scripts/ld.script:
boards/arm/stm32/b-g474e-dpow1/src/.gitignore:
boards/arm/stm32/b-g474e-dpow1/src/Make.defs:
boards/arm/stm32/b-g474e-dpow1/src/b-g474e-dpow1.h:
boards/arm/stm32/b-g474e-dpow1/src/stm32_appinit.c:
boards/arm/stm32/b-g474e-dpow1/src/stm32_autoleds.c:
boards/arm/stm32/b-g474e-dpow1/src/stm32_boot.c:
boards/arm/stm32/b-g474e-dpow1/src/stm32_userleds.c:
* Add minimal support for the B-G474E-DPOW1 Discovery
Board. The board boots successfully through to the
NSH prompt. NSH runs and is responsive.
With big thanks for detailed code review and suggestions:
David Sidrane (davids5)
Mateusz Szafoni (raiden00)
Abdelatif Guettouche (Ouss4)
Xiang Xiao