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arch/arm/stm32: set F412 SRAM1_END to 256KiB

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The F412 has 256KiB of system SRAM at 0x20000000 and no CCM. The F2/F4
heap map had no F412 entry, so it used the 128KiB default at
0x20020000 and left the upper half unused.

Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com>
This commit is contained in:
Jacob Dahl 2026-09-01 14:25:25 -06:00 • committed by Xiang Xiao
parent 02c4f9855e
commit 65d0b3f1ce
1 changed files with 8 additions and 1 deletions
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9
arch/arm/src/common/stm32/stm32_allocateheap_m3m4_v1.c
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@ -329,10 +329,15 @@
*
* 5) 64Kib of System SRAM beginning at address 0x2002:0000
*
* The STM32F412 family has 256KiB of System SRAM in one bank and no CCM:
*
* 6) 256KiB of System SRAM beginning at address 0x2000:0000
*
* As determined by the linker script, g_heapbase lies in the 112KiB memory
* region and that extends to 0x2001:0000. But the first and second memory
* regions are contiguous and treated as one in this logic that extends to
* 0x2002:0000 (or 0x2003:0000 for the F427/F437/F429/F439).
* 0x2002:0000 (or 0x2003:0000 for the F427/F437/F429/F439, or 0x2004:0000
* for the F412).
*
* As a complication, CCM SRAM cannot be used for DMA. So, if STM32 DMA is
* enabled, CCM SRAM should probably be excluded from the heap or the
@ -363,6 +368,8 @@
# define SRAM1_END 0x20008000
# elif defined(CONFIG_STM32_STM32F427) || defined(CONFIG_STM32_STM32F429)
# define SRAM1_END 0x20030000
# elif defined(CONFIG_STM32_STM32F412)
# define SRAM1_END 0x20040000
# elif defined(CONFIG_STM32_STM32F446)
# define SRAM1_END 0x20020000
# elif defined(CONFIG_STM32_STM32F469)