arch: arm: rom_start relocation configuration (8ef8e8b4) · Commits · Wenxi XU / zephyr

arch/arm/Kconfig

+65 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,71 @@ config ARM_CUSTOM_INTERRUPT_CONTROLLER
		is assumed that the custom interrupt control interface implementation
		assumes responsibility for handling the NVIC.

		config ROMSTART_RELOCATION_ROM
		bool
		default n
		help
		Relocates the rom_start region containing the boot-vector data and
		irq vectors to the region specified by configurations:
		ROMSTART_REGION_ADDRESS and ROMSTART_REGION_SIZE

		This is useful for the Linux Remoteproc framework that uses the elf-loader
		such that it is able to load the correct boot-vector (contained in rom_start)
		into the correct memory location independent of the chosen zephyr,flash
		ROM region.

		Most SOCs include an alias for the boot-vector at address 0x00000000
		so a default which might be supported by the corresponding Linux rproc driver.
		If it is not, additionnal options allows to specify the addresses.

		In general this option should be chosen if the zephyr,flash chosen node
		is not placed into the boot-vector memory area.

		While this aims at generating a correct zephyr.elf file, it has the side
		effect of enlarging the bin file. If the zephyr.bin file is used to boot the
		secondary core, this option should be disabled.

		Example:
		on IMX7D, the chosen zephyr,flash can be OCRAM/OCRAM_S/TCM/DDR memories
		for code location. But the boot-vector must be placed into OCRAM_S for the
		CORTEX-M to boot (alias 0, real 0x00180000/32K available).

		if ROMSTART_RELOCATION_ROM

		config ROMSTART_REGION_ADDRESS
		hex
		default 0x00000000
		help
		Start address of the rom_start region.
		This setting can be derived from a DT node reg property or specified directly.

		A default value of 0x00000000 might work in most cases as SOCs have an alias
		to the right memory region of the boot-vector.

		Examples:
		-IMX7D the boot-vector is OCRAM_S (0x00180000, aliased at 0x0).
		-IMX6SX the boot-vector is TCML (0x007F8000, aliased at 0x0).
		-IMX8MQ the boot-vector is TCML (0x007E0000, aliased at 0x0).
		-IMX8MN the boot-vector is ITCM (0x007E0000, aliased at 0x0).

		Example of DT definition:
		$(dt_nodelabel_reg_addr_hex,ocram_s_sys)

		config ROMSTART_REGION_SIZE
		hex
		default 1
		help
		Size of the rom_start region in KB.

		Default is 1KB which is enough to store the boot and irq vectors.

		This setting can be derived from a DT node reg property or specified directly.

		Example for IMX7D that needs the boot-vector into OCRAM_S (0x00180000):
		$(dt_nodelabel_reg_size_hex,ocram_s_sys,0,K)

		endif

		config CODE_DATA_RELOCATION_SRAM
		bool "Relocate code/data sections to SRAM"
		depends on CPU_CORTEX_M

include/zephyr/arch/arm/cortex_m/scripts/linker.ld

+12 −1

Original line number	Diff line number	Diff line
		@@ -26,6 +26,14 @@
		#endif
		#define RAMABLE_REGION RAM

		/* Region of the irq vectors and boot-vector SP/PC */
		#if defined(CONFIG_ROMSTART_RELOCATION_ROM)
		#define ROMSTART_ADDR CONFIG_ROMSTART_REGION_ADDRESS
		#define ROMSTART_SIZE (CONFIG_ROMSTART_REGION_SIZE * 1K)
		#else
		#define ROMSTART_REGION ROMABLE_REGION
		#endif

		#if !defined(CONFIG_XIP) && (CONFIG_FLASH_SIZE == 0)
		#define ROM_ADDR RAM_ADDR
		#else
		@@ -85,6 +93,9 @@ _region_min_align = 4;

		MEMORY
		{
		#if defined(CONFIG_ROMSTART_RELOCATION_ROM)
		ROMSTART_REGION (rx) : ORIGIN = ROMSTART_ADDR, LENGTH = ROMSTART_SIZE
		#endif
		FLASH (rx) : ORIGIN = ROM_ADDR, LENGTH = ROM_SIZE
		RAM (wx) : ORIGIN = RAM_ADDR, LENGTH = RAM_SIZE
		#if defined(CONFIG_LINKER_DEVNULL_MEMORY)
		@@ -129,7 +140,7 @@ SECTIONS
		*/
		#include <snippets-rom-start.ld>

		} GROUP_LINK_IN(ROMABLE_REGION)
		} GROUP_LINK_IN(ROMSTART_REGION)

		#ifdef CONFIG_CODE_DATA_RELOCATION

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