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stm32f4/Makefile.include: add riotboot requirements

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- Stm32f4 use sectors instead of pages. They go from 16 KB to 128KB.
  The bootloader will use the first sector(16Kb). Slots must start
  at the begining of a sector to not overlap.
- Minimum required RIOBOOT_HDR_LEN or stm32f4 is 0x200
  to respect vector table alignment
This commit is contained in:
fjmolinas 2019-06-08 20:08:56 +02:00 committed by Francisco Molina
parent 75efed16cb
commit c67dfd9918
1 changed files with 17 additions and 0 deletions
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17
cpu/stm32f4/Makefile.include
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@ -1,5 +1,22 @@
export CPU_ARCH = cortex-m4f export CPU_ARCH = cortex-m4f
export CPU_FAM = stm32f4 export CPU_FAM = stm32f4
# STM32F4 uses sectors instead of pages, where the minimum sector length is 16KB
# (the first sector), therefore RIOTBOOT_LEN must be 16KB to cover a whole sector.
RIOTBOOT_LEN ?= 0x4000
# CPU_IRQ_NUMOF for STM32F4 boards is < 102+16 so (118*4 bytes = 472 bytes ~= 0x200)
# RIOTBOOT_HDR_LEN can be set to 0x200.
# Details on alignment requirements for M4 in `cpu/cortexm_common/Makefile.include`.
RIOTBOOT_HDR_LEN ?= 0x200
# Sectors don't have the same length. Per bank there can be up to 12 sectors. The
# first 4 sectors are 16kB long, the 5th is 64kB and the remaining 7 are 128kB.
# Since flash can only be erased by sector, slots can't overlap over sectors.
# RIOTBOOT_LEN is removed twice, once at the start of the flash for the bootloader,
# and a second time at the end of the flash, to get evenly sized and distributed slots.
SLOT0_LEN ?= $(shell printf "0x%x" $$((($(ROM_LEN:%K=%*1024)-2*$(RIOTBOOT_LEN)) / $(NUM_SLOTS))))
SLOT1_LEN ?= $(SLOT0_LEN)
include $(RIOTCPU)/stm32_common/Makefile.include include $(RIOTCPU)/stm32_common/Makefile.include
include $(RIOTMAKE)/arch/cortexm.inc.mk include $(RIOTMAKE)/arch/cortexm.inc.mk