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soc: nordic: add option for forcing RAM power on reboot

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RAM power configuration is preserved through soft reset,
meaning that there is a risk of accessing powered off RAM blocks
when booting in different application (i.e. bootloader).
Add option to force all RAM blocks to be powered on
before triggering soft reset to prevent this from happening.

Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
This commit is contained in:
Nikodem Kastelik 2025-03-28 13:24:27 +01:00 • committed by Benjamin Cabé
commit c3646a34fd
3 changed files with 60 additions and 0 deletions
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5
soc/nordic/common/CMakeLists.txt
View file

@ -9,6 +9,11 @@ zephyr_linker_symbol(SYMBOL soc_reset_hook EXPR "@SystemInit@")
# This file is used when the CMake linker script generator is disabled.
zephyr_linker_sources(SECTIONS platform_init.ld)
# TF-M provides its own reboot sequence
if(NOT CONFIG_TFM_PARTITION_PLATFORM)
zephyr_library_sources_ifdef(CONFIG_ARM reboot.c)
endif()
zephyr_library_sources_ifdef(CONFIG_POWEROFF poweroff.c)
if(CONFIG_ARM)
zephyr_library_sources_ifdef(CONFIG_NRF_PLATFORM_HALTIUM soc_lrcconf.c)

10
soc/nordic/common/Kconfig
View file

@ -7,6 +7,16 @@ config HAS_NORDIC_DMM
config HAS_NORDIC_RAM_CTRL
bool
config NRF_FORCE_RAM_ON_REBOOT
bool "Force all RAM blocks to be powered on before rebooting"
depends on HAS_NORDIC_RAM_CTRL
help
RAM power configuration is preserved through soft reset,
meaning that there is a risk of accessing powered off RAM blocks
when booting in different application (i.e. bootloader).
Force all RAM blocks to be powered on before triggering soft reset
to prevent this from happening.
config NRF_SYS_EVENT
bool "nRF system event support"
select NRFX_POWER if !NRF_PLATFORM_HALTIUM

45
soc/nordic/common/reboot.c Normal file
View file

@ -0,0 +1,45 @@
/*
* Copyright (c) 2025 Nordic Semiconductor ASA
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/sys/reboot.h>
#if defined(CONFIG_HAS_NORDIC_RAM_CTRL)
#include <helpers/nrfx_ram_ctrl.h>
#endif
void sys_arch_reboot(int type)
{
ARG_UNUSED(type);
#ifdef CONFIG_NRF_FORCE_RAM_ON_REBOOT
uint8_t *ram_start;
size_t ram_size;
#if defined(NRF_MEMORY_RAM_BASE)
ram_start = (uint8_t *)NRF_MEMORY_RAM_BASE;
#else
ram_start = (uint8_t *)NRF_MEMORY_RAM0_BASE;
#endif
ram_size = 0;
#if defined(NRF_MEMORY_RAM_SIZE)
ram_size += NRF_MEMORY_RAM_SIZE;
#endif
#if defined(NRF_MEMORY_RAM0_SIZE)
ram_size += NRF_MEMORY_RAM0_SIZE;
#endif
#if defined(NRF_MEMORY_RAM1_SIZE)
ram_size += NRF_MEMORY_RAM1_SIZE;
#endif
#if defined(NRF_MEMORY_RAM2_SIZE)
ram_size += NRF_MEMORY_RAM2_SIZE;
#endif
/* Power on all RAM blocks */
nrfx_ram_ctrl_power_enable_set(ram_start, ram_size, true);
#endif
NVIC_SystemReset();
}