diff --git a/ion/src/device/n0110/ram20008000-20032000.ld b/ion/src/device/n0110/ram20008000-20032000.ld new file mode 100644 index 000000000..292973ffd --- /dev/null +++ b/ion/src/device/n0110/ram20008000-20032000.ld @@ -0,0 +1,81 @@ +/* Create a firmware that runs from RAM. + * Caution: ST's bootloader uses some RAM, so we want to stay off of that memory + * region. Per AN2606, sections 31.1 and 36.1, it's using 16Kbytes form address + * 0x20000000. We'll try to play safe and avoid the first 32KB of RAM. + * + * This is used to: + * - Flash faster. Flashing using ST's ROMed DFU bootloader is reliable but + * very slow. To make flashing faster, we can leverage ST's bootloader to copy + * a small "flasher" in RAM, and run it from there. + * - Run the bench software from the RAM. */ + +MEMORY { + RAM_BUFFER (rw) : ORIGIN = 0x20000000 + 32K, LENGTH = 200K - 32K +} + +/* The stack is quite large: we put it equal to Epsilon's. + * Indeed, when building the flasher, we're making the USB::Calculator object + * live on the stack, and it's quite large (about 4K just for this single + * object). Using a stack too small would result in some memory being + * overwritten (for instance, vtables that live in the .rodata section). */ + +STACK_SIZE = 32K; +_jump_reset_address = 0x00200000; + +SECTIONS { + .isr_vector_table ORIGIN(RAM_BUFFER) : { + KEEP(*(.isr_vector_table)) + } >RAM_BUFFER + + .text : { + . = ALIGN(4); + *(.text) + *(.text.*) + } >RAM_BUFFER + + .init_array : { + . = ALIGN(4); + _init_array_start = .; + KEEP (*(.init_array*)) + _init_array_end = .; + } >RAM_BUFFER + + .rodata : { + . = ALIGN(4); + *(.rodata) + *(.rodata.*) + } >RAM_BUFFER + + .data : { + . = ALIGN(4); + *(.data) + *(.data.*) + } >RAM_BUFFER + + .bss : { + . = ALIGN(4); + _bss_section_start_ram = .; + *(.bss) + *(.bss.*) + *(COMMON) + _bss_section_end_ram = .; + } >RAM_BUFFER + + .stack : { + . = ALIGN(8); + _stack_end = .; + . += (STACK_SIZE - 8); + . = ALIGN(8); + _stack_start = .; + } >RAM_BUFFER + + .phony : { + /* We won't do dynamic memory allocation */ + _heap_start = .; + _heap_end = .; + /* Effectively bypass copying .data to RAM */ + _data_section_start_flash = .; + _data_section_start_ram = .; + _data_section_end_ram = .; + } >RAM_BUFFER +} diff --git a/ion/src/device/n0110/ram20032000.ld b/ion/src/device/n0110/ram20032000.ld new file mode 100644 index 000000000..209acb459 --- /dev/null +++ b/ion/src/device/n0110/ram20032000.ld @@ -0,0 +1,81 @@ +/* Create a firmware that runs from RAM. + * Caution: ST's bootloader uses some RAM, so we want to stay off of that memory + * region. Per AN2606, sections 31.1 and 36.1, it's using 16Kbytes form address + * 0x20000000. We'll try to play safe and avoid the first 32KB of RAM. + * + * This is used to: + * - Flash faster. Flashing using ST's ROMed DFU bootloader is reliable but + * very slow. To make flashing faster, we can leverage ST's bootloader to copy + * a small "flasher" in RAM, and run it from there. + * - Run the bench software from the RAM. */ + +MEMORY { + RAM_BUFFER (rw) : ORIGIN = 0x20000000 + 200K, LENGTH = 256K - 200K +} + +/* The stack is quite large: we put it equal to Epsilon's. + * Indeed, when building the flasher, we're making the USB::Calculator object + * live on the stack, and it's quite large (about 4K just for this single + * object). Using a stack too small would result in some memory being + * overwritten (for instance, vtables that live in the .rodata section). */ + +STACK_SIZE = 32K; +_jump_reset_address = 0x20008000; + +SECTIONS { + .isr_vector_table ORIGIN(RAM_BUFFER) : { + KEEP(*(.isr_vector_table)) + } >RAM_BUFFER + + .text : { + . = ALIGN(4); + *(.text) + *(.text.*) + } >RAM_BUFFER + + .init_array : { + . = ALIGN(4); + _init_array_start = .; + KEEP (*(.init_array*)) + _init_array_end = .; + } >RAM_BUFFER + + .rodata : { + . = ALIGN(4); + *(.rodata) + *(.rodata.*) + } >RAM_BUFFER + + .data : { + . = ALIGN(4); + *(.data) + *(.data.*) + } >RAM_BUFFER + + .bss : { + . = ALIGN(4); + _bss_section_start_ram = .; + *(.bss) + *(.bss.*) + *(COMMON) + _bss_section_end_ram = .; + } >RAM_BUFFER + + .stack : { + . = ALIGN(8); + _stack_end = .; + . += (STACK_SIZE - 8); + . = ALIGN(8); + _stack_start = .; + } >RAM_BUFFER + + .phony : { + /* We won't do dynamic memory allocation */ + _heap_start = .; + _heap_end = .; + /* Effectively bypass copying .data to RAM */ + _data_section_start_flash = .; + _data_section_start_ram = .; + _data_section_end_ram = .; + } >RAM_BUFFER +} diff --git a/scripts/targets.device.mak b/scripts/targets.device.mak index a8c607312..b51a4a4ce 100644 --- a/scripts/targets.device.mak +++ b/scripts/targets.device.mak @@ -54,7 +54,7 @@ openocd: # fully filled ifeq ($(EPSILON_USB_DFU_XIP)$(EPSILON_DEVICE_BENCH),10) $(BUILD_DIR)/ion/src/$(PLATFORM)/shared/usb/flasher.o: SFLAGS += $(ION_DEVICE_SFLAGS) -$(BUILD_DIR)/flasher.$(EXE): LDSCRIPT = ion/src/$(PLATFORM)/$(MODEL)/ram.ld +$(BUILD_DIR)/flasher.$(EXE): LDSCRIPT = ion/src/$(PLATFORM)/$(MODEL)/ram20032000.ld $(BUILD_DIR)/flasher.$(EXE): $(objs) $(BUILD_DIR)/ion/src/$(PLATFORM)/shared/usb/flasher.o else $(BUILD_DIR)/flasher.$(EXE): @@ -63,7 +63,7 @@ endif #TODO Do not build all apps... Put elsewhere? ifeq ($(EPSILON_USB_DFU_XIP)$(EPSILON_DEVICE_BENCH),11) -$(BUILD_DIR)/benchRAM.$(EXE): LDSCRIPT = ion/src/$(PLATFORM)/$(MODEL)/ram.ld +$(BUILD_DIR)/benchRAM.$(EXE): LDSCRIPT = ion/src/$(PLATFORM)/$(MODEL)/ram20008000-20032000.ld $(BUILD_DIR)/benchRAM.$(EXE): $(objs) $(call object_for,$(bench_src)) else $(BUILD_DIR)/benchRAM.$(EXE):