imx8mq-evk: initial support for aarch32

libsel4/sel4_plat_include/imx8mq-evk/sel4/plat/api/constants.h

@@ -17,6 +17,14 @@
 #include <autoconf.h>
 #endif
 
+#define seL4_NumHWBreakpoints (10)
+#define seL4_NumExclusiveBreakpoints (6)
+#define seL4_NumExclusiveWatchpoints (4)
+#ifdef CONFIG_HARDWARE_DEBUG_API
+#define seL4_FirstWatchpoint (6)
+#define seL4_NumDualFunctionMonitors (0)
+#endif
+
 #if CONFIG_WORD_SIZE == 32
 /* First address in the virtual address space that is not accessible to user level */
 #define seL4_UserTop 0xe0000000

src/plat/imx8mq-evk/config.cmake

@@ -12,10 +12,20 @@
 
 cmake_minimum_required(VERSION 3.7.2)
 
-declare_platform(imx8mq-evk KernelPlatformImx8mq-evk PLAT_IMX8MQ_EVK KernelSel4ArchAarch64)
+declare_platform(imx8mq-evk KernelPlatformImx8mq-evk PLAT_IMX8MQ_EVK KernelArchARM)
 
 if(KernelPlatformImx8mq-evk)
-    declare_seL4_arch(aarch64)
+    if("${KernelSel4Arch}" STREQUAL aarch32)
+        declare_seL4_arch(aarch32)
+    elseif("${KernelSel4Arch}" STREQUAL aarch64)
+        declare_seL4_arch(aarch64)
+    else()
+        message(
+            STATUS "Selected platform ${KernelPlatform} supports multiple architectures but none were given"
+        )
+        message(STATUS "  Defaulting to aarch64")
+        declare_seL4_arch(aarch64)
+    endif()
     set(KernelArmCortexA53 ON)
     set(KernelArchArmV8a ON)
     config_set(KernelARMPlatform PLAT "imx8mq-evk")
@@ -23,6 +33,9 @@ if(KernelPlatformImx8mq-evk)
     set(KernelArmPASizeBits40 ON)
     list(APPEND KernelDTSList "tools/dts/imx8mq-evk.dts")
     list(APPEND KernelDTSList "src/plat/imx8mq-evk/overlay-imx8m.dts")
+    if(KernelSel4ArchAarch32)
+        list(APPEND KernelDTSList "src/plat/imx8mq-evk/overlay-imx8m-32bit.dts")
+    endif()
     declare_default_headers(
         TIMER_FREQUENCY 8000000llu
         MAX_IRQ 160

src/plat/imx8mq-evk/overlay-imx8m-32bit.dts

+/*
+ * Copyright 2019, Data61
+ * Commonwealth Scientific and Industrial Research Organisation (CSIRO)
+ * ABN 41 687 119 230.
+ *
+ * This software may be distributed and modified according to the terms of
+ * the GNU General Public License version 2. Note that NO WARRANTY is provided.
+ * See "LICENSE_GPLv2.txt" for details.
+ *
+ * @TAG(DATA61_GPL)
+ */
+
+/ {
+
+    /* 32-bit kernel platforms require memory to be clamped to the top of
+     * the kernel window.
+     */
+	memory@40000000 {
+		device_type = "memory";
+		reg = < 0x00 0x40000000 0x00 0x1f000000 >;
+	};
+
+	/* This device extends out of the 32-bit memory range.*/
+	/delete-node/gpu@38000000;
+};