MACRO

Platform module

• -D __CHIP__=xxx
• -D'INC_PLAT(x)=<platform/__CHIP__/x>'
• #include INC_PLAT(gpio.h)

1
2

$ find |grep gpio.h
./include/platform/stm32f4/gpio.h

compiler front end options

• -std=gnu99
• -isystem
• -nostdlib
• -ffreestanding
• -mcpu=cortex-m4
• -mthumb
• -mthumb-interwork
  • Specify that the code has been generated with interworking between Thumb and ARM code in mind.
• -Xassembler -mimplicit-it=thumb -mno-sched-prolog -mno-unaligned-access
• -Wdouble-promotion
• -fsingle-precision-constant
• -fshort-double
• -fno-toplevel-reorder
• -fdata-sections
• -ffunction-sections
• -g3
• -Wall
• -Werror
• -Wundef
• -Wstrict-prototypes
• -Wno-trigraphs
• -fno-strict-aliasing
• -fno-common
• -Werror-implicit-function-declaration
• -Wno-format-security
• -fno-delete-null-pointer-checks
• -Wdeclaration-after-statement
• -Wno-pointer-sign
• -fno-strict-overflow
• -fconserve-stack
• -MMD
• -MF

Build directory order

1. platform/stm32f4/
2. board/discoveryf4/
3. platform/
4. kernel/lib/
5. kernel/
6. user/
7. user/lib/l4/platform/
8. user/lib/io/
9. user/apps/

.config

• Platform related
• Limitation
• Kernel timer
• Flexiable page
• Thread
• KIP
• Kernel debug

Build binaries

Root Makefile

• Options
  • BOARD
  • PROJECT
• Decide which files to compiled and linked

Implicit Rules

• CC
  • mk/generic.mk
• Loader
  • mk/loader.mk

Questions

• Makefile
  • eval command?