soc: nxp: s32k3: fix erratum ERR011573
Due to erratum ERR011573, speculative accesses might be performed to normal memory unmapped in the MPU. This can be avoided by using MPU region 0 to cover all unmapped memory and make this region execute-never and inaccessible. Fixes #89852 Co-authored-by: Peter van der Perk <peter.vanderperk@nxp.com> Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>
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@ -1,5 +1,5 @@
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/*
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* Copyright 2023 NXP
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* Copyright 2023, 2025 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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@ -14,6 +14,13 @@ extern char _rom_attr[];
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static struct arm_mpu_region mpu_regions[] = {
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/* ERR011573: use first region to prevent speculative access in entire memory space */
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{
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.name = "BACKGROUND",
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.base = 0,
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.attr = {REGION_4G | MPU_RASR_XN_Msk | P_NA_U_NA_Msk},
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},
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/* Keep before CODE region so it can be overlapped by SRAM CODE in non-XIP systems */
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{
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.name = "SRAM",
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