[PATCH v2] arm: Add ARMv8-M aarch32 support

[Marek Vasut]

On 3/31/26 8:04 AM, Kumar, Udit wrote:
> 
> 
> On 3/30/2026 4:44 AM, Marek Vasut wrote:
>> Add configuration for ARMv8-M aarch32 core, which are currently
>> Cortex-M23/M33 cores. These cores are treated similar to ARMv7-M
>> cores, except the code has to be compiled with matching compiler
>> -march=armv8-m.main flag . These cores have no MMU, they have MPU,
>> which is currently not configured.
>>
>> Unlike ARMv7-M, these cores have 512 interrupt vectors. While the
>> SYS_ARM_ARCH should be set to 8, it is set to 7 because all of the
>> initialization code is built from from arch/arm/cpu/armv7m and not
>> armv8. Furthermore, CONFIG_ARM64 must be disabled, although DTs
>> for devices using these cores do come from arch/arm64/boot/dts .
>>
>> To avoid excess duplication in Makefiles, introduce one new Kconfig
>> symbol, CPU_V7M_V8M. The CPU_V7M_V8M cover both ARMv7-M and ARMv8-M
>> cores.
>>
>> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
>> ---
>> Cc: Casey Connolly <casey.connolly at linaro.org>
>> Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
>> Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
>> Cc: Jerome Forissier <jerome.forissier at arm.com> <jerome at forissier.org>
>> Cc: Tom Rini <trini at konsulko.com>
>> Cc: Udit Kumar <u-kumar1 at ti.com>
>> Cc: u-boot at lists.denx.de
>> ---
>> V2: - Rename CPU_V78M to CPU_V7M_V8M
>>      - Isolate V7M specific and otherwise option bits in cpu.c
> 
> Thanks for v2 Marek,
> Apart of name of config discussion over v1 [0].
> 
> For changes,
> Acked-by: Udit Kumar <u-kumar1 at ti.com>
> 
> [0] :
> https://lore.kernel.org/all/30108d25-efd6-4ff6-9bfe-0dc55670a83f@mailbox.org/
Tom, is the naming now OK ?