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stm32/mboot: Allow a board to customise the linker scripts.

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A board can now define MBOOT_LD_FILES (at the Makefile-level) to specify
custom linker scripts.  And stm32_generic.ld has been split into 2 pieces
so one or the other can be reused (usually stm32_sections.ld wolud be
reused by a board, and stm32_memory.ld redefined).

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2021-04-28 16:26:20 +10:00
parent 97f09fda3e
commit 58be5a5aa3
3 changed files with 14 additions and 9 deletions
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3
ports/stm32/mboot/Makefile
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@ -85,7 +85,8 @@ CFLAGS += -DBUILDING_MBOOT=$(BUILDING_MBOOT)
CFLAGS += -DMICROPY_HW_STM32WB_FLASH_SYNCRONISATION=0 CFLAGS += -DMICROPY_HW_STM32WB_FLASH_SYNCRONISATION=0
CFLAGS += -DBOOTLOADER_DFU_USB_VID=$(BOOTLOADER_DFU_USB_VID) -DBOOTLOADER_DFU_USB_PID=$(BOOTLOADER_DFU_USB_PID) CFLAGS += -DBOOTLOADER_DFU_USB_VID=$(BOOTLOADER_DFU_USB_VID) -DBOOTLOADER_DFU_USB_PID=$(BOOTLOADER_DFU_USB_PID)
LDFLAGS = -nostdlib -L . -T stm32_generic.ld -Map=$(@:.elf=.map) --cref MBOOT_LD_FILES ?= stm32_memory.ld stm32_sections.ld
LDFLAGS = -nostdlib -L . $(addprefix -T,$(MBOOT_LD_FILES)) -Map=$(@:.elf=.map) --cref
LIBS = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name) LIBS = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
# Remove uncalled code from the final image. # Remove uncalled code from the final image.

10
ports/stm32/mboot/stm32_memory.ld Normal file
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@ -0,0 +1,10 @@
/*
Linker script fragment for mboot on an STM32xxx MCU.
This defines the memory sections for the bootloader to use.
*/
MEMORY
{
FLASH_BL (rx) : ORIGIN = 0x08000000, LENGTH = 32K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 120K
}

10
ports/stm32/mboot/stm32_generic.ld → ports/stm32/mboot/stm32_sections.ld
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@ -1,14 +1,8 @@
/* /*
GNU linker script for generic STM32xxx MCU Linker script fragment for mboot on an STM32xxx MCU.
This needs the following MEMORY sections to be defined: FLASH_BL, RAM.
*/ */
/* Specify the memory areas */
MEMORY
{
FLASH_BL (rx) : ORIGIN = 0x08000000, LENGTH = 32K /* sector 0 (can be 32K) */
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 120K
}
/* produce a link error if there is not this amount of RAM for these sections */ /* produce a link error if there is not this amount of RAM for these sections */
_minimum_stack_size = 8K; _minimum_stack_size = 8K;