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cpu/stm32: setup memory length for stm32mp157x

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The stm32mp157c has the particularity to not having flash memory but
only SRAM.
Thus a part of SRAM must be considered as a ROM to flash the firmware
into.
In case of the stm32mp157c, the RETRAM (64kB) is used as ROM and the
4 banks of SRAM (384kB) are used as RAM.
However, as ROM_LEN, RAM_LEN, ROM_START_ADDRESS, RAM_START_ADDRESS and
ROM_OFFSET could be overloaded by user, set them with "?=" operator.
If the ROM_START_ADDRESS and the RAM_START_ADDRESS are not set at the
end of that file, it is a classic stm32 MCU with flash, thus set this
variables with common memory addresses for stm32 MCU family:
ROM_START_ADDR ?= 0x08000000
RAM_START_ADDR ?= 0x20000000

Signed-off-by: Gilles DOFFE <gilles.doffe@savoirfairelinux.com>
This commit is contained in:
Gilles DOFFE 2020-08-02 23:48:59 +02:00
parent 4bfbb75578
commit 7b7a75c3ca
1 changed files with 33 additions and 4 deletions
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37
cpu/stm32/stm32_mem_lengths.mk
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@ -1,7 +1,3 @@
# Set the common memory addresses for stm32 MCU family
ROM_START_ADDR ?= 0x08000000
RAM_START_ADDR ?= 0x20000000
# The next block takes care of setting the rigth lengths of RAM and ROM # The next block takes care of setting the rigth lengths of RAM and ROM
# for the stm32 family. Most of the CPUs should have been taken into # for the stm32 family. Most of the CPUs should have been taken into
# account here, so no need to assign the lengths per model. # account here, so no need to assign the lengths per model.
@ -278,6 +274,13 @@ else ifeq ($(STM32_TYPE), W)
endif endif
endif endif
endif endif
else ifeq ($(STM32_TYPE), MP)
ifeq ($(STM32_FAMILY), 1)
ifeq ($(STM32_MODEL), 157)
RAM_START_ADDR = 0x10000000
RAM_LEN = 384K
endif
endif
endif endif
ifeq ($(RAM_LEN), ) ifeq ($(RAM_LEN), )
@ -308,6 +311,26 @@ else ifeq ($(STM32_ROMSIZE), H)
ROM_LEN = 1536K ROM_LEN = 1536K
else ifeq ($(STM32_ROMSIZE), I) else ifeq ($(STM32_ROMSIZE), I)
ROM_LEN = 2048K ROM_LEN = 2048K
else ifeq ($(STM32_TYPE), MP)
ifeq ($(STM32_FAMILY), 1)
# STM32MP1 family has no flash ROM memory.
# Thus a part of SRAM must be considered as ROM.
# RETRAM (0x0 address) is setup as ROM by default.
# However in RIOT, vector table is relocated using VTOR register.
# Considering the minimum alignment is 128 words and knowing the number of
# interrupt vectors for a given MCU, if a device has for example 150 interrupt
# channels:
# Vector table has a size of 150 * 4 = 600 = 0x258
# As the table should be 128 word aligned, vector table size reserved is 0x400.
ifeq ($(STM32_MODEL), 157)
ROM_START_ADDR ?= 0x0
ifneq (,$(filter stm32mp1_eng_mode,$(USEMODULE)))
ROM_OFFSET ?= 0x400
endif
ROM_LEN ?= 64K
endif
endif
else
endif endif
ifeq ($(STM32_PINCOUNT), A) ifeq ($(STM32_PINCOUNT), A)
@ -348,4 +371,10 @@ else ifeq ($(STM32_PINCOUNT), V)
STM32_PIN = 100 STM32_PIN = 100
else ifeq ($(STM32_PINCOUNT), Z) else ifeq ($(STM32_PINCOUNT), Z)
STM32_PIN = 144 STM32_PIN = 144
else ifeq ($(STM32_PINCOUNT), AC)
STM32_PIN = 361
endif endif
# Set the common memory addresses for stm32 MCU family
ROM_START_ADDR ?= 0x08000000
RAM_START_ADDR ?= 0x20000000