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stm32f2/Makefile.include: add riotboot requirements

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- stm32f2 uses sectors instead of pages, they go from 16KB to
  128KB. Smaller sectors are at the begining of the flash. Slots
  must start at the begining of a sector to not overlap.
- Minimum required RIOBOOT_HDR_LEN or stm32f2 is 0x200
  to respect vector table alignment
This commit is contained in:
Francisco Molina 2019-07-24 10:40:19 +02:00
parent 7eb579bf4f
commit f5b8355140
1 changed files with 18 additions and 0 deletions
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18
cpu/stm32f2/Makefile.include
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@ -1,5 +1,23 @@
export CPU_ARCH = cortex-m3
export CPU_FAM = stm32f2
# STM32F2 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 STM32F2 boards is < 81+16 so (97*4 bytes = 388 bytes ~= 0x200)
# RIOTBOOT_HDR_LEN can be set to 0x200.
# Details on alignment requirements for M3 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.
# The most efficient layout comes from removing RIOTBOOT_LEN 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 $(RIOTMAKE)/arch/cortexm.inc.mk