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cpu/cortexm_common: add .backup.noinit section #21559

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Merged
merged 1 commit into from
Jun 24, 2025
Merged

cpu/cortexm_common: add .backup.noinit section #21559

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6 changes: 6 additions & 0 deletions cpu/cortexm_common/include/cpu_conf_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,12 @@ extern "C" {
* and initialized with user provided data on cold boot.
*/
#define BACKUP_RAM_DATA __attribute__((section(".backup.data")))

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and never initialized.
*/
#define BACKUP_RAM_NOINIT __attribute__((section(".backup.noinit")))
#endif /* CPU_HAS_BACKUP_RAM */

/**
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6 changes: 6 additions & 0 deletions cpu/cortexm_common/ldscripts/cortexm_base.ld
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Expand Up @@ -229,6 +229,12 @@ SECTIONS
. = ALIGN(4);
} > bkup_ram

.backup.noinit (NOLOAD) : ALIGN(4) {
_sbackup_noinit = .;
*(.backup.noinit)
_ebackup_noinit = .;
} > bkup_ram

.heap3 (NOLOAD) : ALIGN(4) {
_sheap1 = . ;
_eheap1 = ORIGIN(bkup_ram) + LENGTH(bkup_ram);
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