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24 lines
1.1 KiB
Makefile
24 lines
1.1 KiB
Makefile
CPU_ARCH = cortex-m3
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CPU_FAM = stm32f2
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# STM32F2 uses sectors instead of pages, where the minimum sector length is 16KB
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# (the first sector), therefore RIOTBOOT_LEN must be 16KB to cover a whole sector.
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RIOTBOOT_LEN ?= 0x4000
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# CPU_IRQ_NUMOF for STM32F2 boards is < 81+16 so (97*4 bytes = 388 bytes ~= 0x200)
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# RIOTBOOT_HDR_LEN can be set to 0x200.
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# Details on alignment requirements for M3 in `cpu/cortexm_common/Makefile.include`.
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RIOTBOOT_HDR_LEN ?= 0x200
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# Sectors don't have the same length. Per bank there can be up to 12 sectors. The
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# first 4 sectors are 16kB long, the 5th is 64kB and the remaining 7 are 128kB.
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# Since flash can only be erased by sector, slots can't overlap over sectors.
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# The most efficient layout comes from removing RIOTBOOT_LEN twice, once at the
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# start of the flash for the bootloader, and a second time at the end of the
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# flash, to get evenly sized and distributed slots.
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SLOT0_LEN ?= $(shell printf "0x%x" $$((($(ROM_LEN:%K=%*1024)-2*$(RIOTBOOT_LEN)) / $(NUM_SLOTS))))
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SLOT1_LEN ?= $(SLOT0_LEN)
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include $(RIOTCPU)/stm32_common/Makefile.include
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include $(RIOTMAKE)/arch/cortexm.inc.mk
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