On Fri, 2025-08-15 at 09:02 -0700, Daniel Schultz wrote: > The watchdog requires to have the MCU ESM error source enabled to > trigger a system reboot. When booting HS-SE (security enforced) > devices, the MMR registers are locked again and all write commands > are simply ignored. > > Unlock the MMR registers again to successfully enable the MCU ESM > source. > > Signed-off-by: Daniel Schultz <[email protected]>
Reviewed-by: Alexander Sverdlin <[email protected]> > --- > arch/arm/mach-k3/am62x/am625_init.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm/mach-k3/am62x/am625_init.c > b/arch/arm/mach-k3/am62x/am625_init.c > index a422919fab1..498bbe45b38 100644 > --- a/arch/arm/mach-k3/am62x/am625_init.c > +++ b/arch/arm/mach-k3/am62x/am625_init.c > @@ -84,6 +84,9 @@ static void ctrl_mmr_unlock(void) > > static __maybe_unused void enable_mcu_esm_reset(void) > { > + /* CTRLMMR_MCU_RST registers are locked again on HS-SE devices */ > + mmr_unlock(MCU_CTRL_MMR0_BASE, 6); > + > /* Set CTRLMMR_MCU_RST_CTRL:MCU_ESM_ERROR_RST_EN_Z to '0' (low active) > */ > u32 stat = readl(CTRLMMR_MCU_RST_CTRL); -- Alexander Sverdlin Siemens AG www.siemens.com
