The NVIC should always be a little-endian device as big-endian
behaviour is a function of the current CPU configuration not the
system as a whole. Indeed the Armv8-M architecture reference manual
declares:

  All accesses to the Private Peripheral Bus (PPB) are always
  little-endian, which means that the PE assumes a little-endian
  arrangement of the PPB registers.

This should have no functional effect as the NVIC cannot be
instantiated on a BE system but will help the single binary efforts.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 hw/intc/armv7m_nvic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index 3a31eb56f36..28b34e99446 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -2467,7 +2467,7 @@ static MemTxResult nvic_sysreg_write(void *opaque, hwaddr addr,
 static const MemoryRegionOps nvic_sysreg_ops = {
     .read_with_attrs = nvic_sysreg_read,
     .write_with_attrs = nvic_sysreg_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static int nvic_post_load(void *opaque, int version_id)
-- 
2.47.3

On 21/1/26 11:59, Alex Bennée wrote:
> The NVIC should always be a little-endian device as big-endian
> behaviour is a function of the current CPU configuration not the
> system as a whole. Indeed the Armv8-M architecture reference manual
> declares:
> 
>    All accesses to the Private Peripheral Bus (PPB) are always
>    little-endian, which means that the PE assumes a little-endian
>    arrangement of the PPB registers.
> 
> This should have no functional effect as the NVIC cannot be
> instantiated on a BE system but will help the single binary efforts.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>   hw/intc/armv7m_nvic.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

On Wed, 21 Jan 2026 at 10:59, Alex Bennée <alex.bennee@linaro.org> wrote:
>
> The NVIC should always be a little-endian device as big-endian
> behaviour is a function of the current CPU configuration not the
> system as a whole. Indeed the Armv8-M architecture reference manual
> declares:
>
>   All accesses to the Private Peripheral Bus (PPB) are always
>   little-endian, which means that the PE assumes a little-endian
>   arrangement of the PPB registers.
>
> This should have no functional effect as the NVIC cannot be
> instantiated on a BE system but will help the single binary efforts.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>  hw/intc/armv7m_nvic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM