portenta_h7: replace USERSPACE with disable_mpu_rasr_xn hack

Author: facchinm

loader/boards/arduino_portenta_h7_m7.conf

@@ -16,16 +16,19 @@ CONFIG_ICACHE=y
 CONFIG_DCACHE=y
 CONFIG_CACHE_MANAGEMENT=y
 
-CONFIG_USERSPACE=y
+CONFIG_USERSPACE=n
 CONFIG_ARM_MPU=y
 CONFIG_MAX_THREAD_BYTES=4
 
 CONFIG_SHELL_STACK_SIZE=32768
+CONFIG_MAIN_STACK_SIZE=32768
 CONFIG_LLEXT_HEAP_SIZE=128
 
 #CONFIG_ADC=y
 #CONFIG_PWM=y
 
+CONFIG_NET_CORE_LOG_LEVEL_DBG=y
+
 CONFIG_NETWORKING=y
 CONFIG_NET_IPV6=n
 CONFIG_NET_IPV4=y
@@ -39,8 +42,12 @@ CONFIG_DNS_SERVER1="8.8.8.8"
 
 CONFIG_INIT_STACKS=y
 
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_NET_MGMT=y
 CONFIG_NET_MGMT=y
 CONFIG_NET_MGMT_EVENT=y
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_L2_ETHERNET_MGMT=y
 
 CONFIG_TINYCRYPT=y
 CONFIG_TINYCRYPT_AES=y

loader/fixups.c

@@ -1,6 +1,5 @@
-#if CONFIG_BOARD_ARDUINO_NANO_33_BLE
-
 #include <cmsis_core.h>
+#include <zephyr/init.h>
 void disable_mpu_rasr_xn(void)
 {
 	uint32_t index;
@@ -21,6 +20,7 @@ void disable_mpu_rasr_xn(void)
 	}
 }
 
+#if defined(CONFIG_BOARD_ARDUINO_NANO_33_BLE)
 int disable_bootloader_mpu() {
 	// MPU was previously enabled in the bootloader
 	// https://github.com/bcmi-labs/zephyr/blob/31cb7dd00fd5bce4c69896b3b2ddf6259d0c0f2b/boards/arm/arduino_nano_33_ble/arduino_nano_33_ble_defconfig#L10C1-L10C15
@@ -32,5 +32,8 @@ int disable_bootloader_mpu() {
     return 0;
 }
 SYS_INIT(disable_bootloader_mpu, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
+#endif
 
+#if defined (CONFIG_BOARD_ARDUINO_PORTENTA_H7)
+SYS_INIT(disable_mpu_rasr_xn, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
 #endif

variants/arduino_portenta_h7/variant.cpp

@@ -0,0 +1,8 @@
+#include <zephyr/kernel.h>
+
+void _on_1200_bps() {
+    uint32_t tmp = (uint32_t) & (RTC->BKP0R);
+    tmp += (RTC_BKP_DR0 * 4U);
+    *(__IO uint32_t *)tmp = (uint32_t)0xDF59;
+    NVIC_SystemReset();
+}