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linker: arm: add stm32 ccm sections

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The STM32 has special Core Coupled Memory, ccm for short, that can
only be accessed through the CPU and can not be use for DMA.

The following 3 sections have been added.
- ccm_bss for zero initialized data
- ccm_data for initialized data
- ccm_noinit for uninitialized data

Signed-off-by: Erwin Rol <erwin@erwinrol.com>
This commit is contained in:
Erwin Rol 2017-10-05 01:20:21 +02:00 • committed by Kumar Gala
commit 581446d8cd
4 changed files with 63 additions and 0 deletions
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13
include/linker/linker-defs.h
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@ -235,6 +235,19 @@ extern char _vector_end[];
/* end address of image, used by newlib for the heap */
extern char _end[];
#ifdef CONFIG_CCM_BASE_ADDRESS
extern char __ccm_data_rom_start[];
extern char __ccm_start[];
extern char __ccm_data_start[];
extern char __ccm_data_end[];
extern char __ccm_bss_start[];
extern char __ccm_bss_end[];
extern char __ccm_noinit_start[];
extern char __ccm_noinit_end[];
extern char __ccm_end[];
#endif /* CONFIG_CCM_BASE_ADDRESS */
#endif /* ! _ASMLANGUAGE */
#endif /* _LINKERDEFS_H */

3
include/linker/section_tags.h
View file

@ -20,6 +20,9 @@
#if defined(CONFIG_ARM)
#define __kinetis_flash_config_section __in_section_unique(KINETIS_FLASH_CONFIG)
#define __ti_ccfg_section _GENERIC_SECTION(TI_CCFG)
#define __ccm_data_section _GENERIC_SECTION(_CCM_DATA_SECTION_NAME)
#define __ccm_bss_section _GENERIC_SECTION(_CCM_BSS_SECTION_NAME)
#define __ccm_noinit_section _GENERIC_SECTION(_CCM_NOINIT_SECTION_NAME)
#endif /* CONFIG_ARM */
#endif /* !_ASMLANGUAGE */

5
include/linker/sections.h
View file

@ -51,6 +51,11 @@
#if defined(CONFIG_ARM)
#define KINETIS_FLASH_CONFIG kinetis_flash_config
#define TI_CCFG .ti_ccfg
#define _CCM_DATA_SECTION_NAME ccm_data
#define _CCM_BSS_SECTION_NAME ccm_bss
#define _CCM_NOINIT_SECTION_NAME ccm_noinit
#endif
#include <linker/section_tags.h>