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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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3
include/arch/arm/aarch32/cortex_m/scripts/linker.ld
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@ -131,6 +131,9 @@ MEMORY
#if DT_NODE_HAS_STATUS(DT_NODELABEL(sdram2), okay)
SDRAM2 (rw) : ORIGIN = DT_REG_ADDR(DT_NODELABEL(sdram2)), LENGTH = DT_REG_SIZE(DT_NODELABEL(sdram2))
#endif
#endif
#ifdef CONFIG_STM32_BACKUP_SRAM
BACKUP_SRAM (rw) : ORIGIN = DT_REG_ADDR(DT_NODELABEL(backup_sram)), LENGTH = DT_REG_SIZE(DT_NODELABEL(backup_sram))
#endif
/* Used by and documented in include/linker/intlist.ld */
IDT_LIST (wx) : ORIGIN = (RAM_ADDR + RAM_SIZE), LENGTH = 2K