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arch: arm: core: aarch32: support for On-Chip Memory (OCM) areas in aarch32

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Introduce support for On-Chip Memory (OCM) areas in aarch32 Cortex-A
SoCs. This memory area is suitable for, amongst other things, un-
cached device DMA. The OCM memory can reside either at address zero
or at a high memory address, with configuration of the memory's lo-
cation similar to the configuration of the location of the exception
vectors. In both cases, it must be assured that the low/high OCM
area declaration doesn't overlap with the exception vectors memory
page at either the low/high address. Therefore, all possible OCM
location options shall be described in the SoC's device tree, the
current location shall be indicated via a "chosen" entry in the
target board's device tree.

This commit contains the necessary changes to the linker-related
files as well as the static region declaration for the MMU in-
itialization in the Zynq-7000 SoC-specific init code.

Signed-off-by: Immo Birnbaum <Immo.Birnbaum@weidmueller.com>
This commit is contained in:
Immo Birnbaum 2021-07-15 13:15:53 +02:00 • committed by Carles Cufí
commit 01882b8624
4 changed files with 41 additions and 2 deletions
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7
include/linker/sections.h
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@ -42,7 +42,7 @@
/* Architecture-specific sections */
#if defined(CONFIG_ARM)
#define _KINETIS_FLASH_CONFIG_SECTION_NAME kinetis_flash_config
#define _TI_CCFG_SECTION_NAME .ti_ccfg
#define _TI_CCFG_SECTION_NAME .ti_ccfg
#define _CCM_DATA_SECTION_NAME .ccm_data
#define _CCM_BSS_SECTION_NAME .ccm_bss
@ -50,9 +50,12 @@
#define _ITCM_SECTION_NAME .itcm
#define _DTCM_DATA_SECTION_NAME .dtcm_data
#define _DTCM_DATA_SECTION_NAME .dtcm_data
#define _DTCM_BSS_SECTION_NAME .dtcm_bss
#define _DTCM_NOINIT_SECTION_NAME .dtcm_noinit
#define _OCM_DATA_SECTION_NAME .ocm_data
#define _OCM_BSS_SECTION_NAME .ocm_bss
#endif
#define _IMX_BOOT_CONF_SECTION_NAME .boot_hdr.conf