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soc: arm: st_stm32: add support for STM32 backup SRAM

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Add support for backup SRAM initialization found in multiple STM32
microcontrollers. Linker script facilities are also provided to make it
easy to define variables in the backup SRAM.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
This commit is contained in:
Gerard Marull-Paretas 2021-01-27 13:20:29 +01:00 • committed by Anas Nashif
commit 10532a5310
8 changed files with 113 additions and 0 deletions
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1
include/linker/section_tags.h
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@ -33,6 +33,7 @@
#define __imx_boot_dcd_section Z_GENERIC_SECTION(_IMX_BOOT_DCD_SECTION_NAME)
#define __stm32_sdram1_section Z_GENERIC_SECTION(_STM32_SDRAM1_SECTION_NAME)
#define __stm32_sdram2_section Z_GENERIC_SECTION(_STM32_SDRAM2_SECTION_NAME)
#define __stm32_backup_sram_section Z_GENERIC_SECTION(_STM32_BACKUP_SRAM_SECTION_NAME)
#endif /* CONFIG_ARM */
#if defined(CONFIG_NOCACHE_MEMORY)

2
include/linker/sections.h
View file

@ -61,6 +61,8 @@
#define _STM32_SDRAM1_SECTION_NAME .stm32_sdram1
#define _STM32_SDRAM2_SECTION_NAME .stm32_sdram2
#define _STM32_BACKUP_SRAM_SECTION_NAME .stm32_backup_sram
#ifdef CONFIG_NOCACHE_MEMORY
#define _NOCACHE_SECTION_NAME nocache
#endif