[nrf fromlist] soc: nrf54h: don't boot radio core if VTOR is not programmed

Upstream PR #: 91826

Booting the radio core when it is not programmed will typically
cause a reset loop. This can happen when programming multiple
images to a device, and the app core image is programmed before
the radio core.

With this change we avoid the reset loop in that case.

Signed-off-by: Håkon Amundsen <[email protected]>
(cherry picked from commit 7c3b2d48fcef0a93a3ae0c26eea42d3b2c8924a6)

Author: hakonfam

soc/nordic/nrf54h/Kconfig

@@ -78,6 +78,13 @@ config SOC_NRF54H20_CPURAD_ENABLE
 	  Radiocore, and also power will be requested to the Radiocore
 	  subsystem. The Radiocore will then start executing instructions.
 
+config SOC_NRF54H20_CPURAD_ENABLE_CHECK_VTOR
+	bool "Check VTOR before booting Radio core"
+	default y
+	depends on SOC_NRF54H20_CPURAD_ENABLE
+	help
+	  Verify that VTOR is not 0xFFFFFFFF before booting the Radiocore.
+
 config SOC_NRF54H20_CPURAD
 	select SOC_NRF54H20_CPURAD_COMMON
 

soc/nordic/nrf54h/soc.c

@@ -198,6 +198,13 @@ void soc_late_init_hook(void)
 		return;
 	}
 
+	if (IS_ENABLED(CONFIG_SOC_NRF54H20_CPURAD_ENABLE_CHECK_VTOR) &&
+	    sys_read32((mem_addr_t)radiocore_address) == 0xFFFFFFFF) {
+		LOG_ERR("Radiocore is not programmed, it will not be started");
+
+		return;
+	}
+
 	/* Don't wait as this is not yet supported. */
 	bool cpu_wait = false;