Add capability to read chip ID and revision from ver command

src/systemcmds/ver/ver.c

@@ -53,13 +53,38 @@ static const char sz_ver_bdate_str[] = "bdate";
 static const char sz_ver_gcc_str[] 	= "gcc";
 static const char sz_ver_all_str[] 	= "all";
 
+#ifdef CONFIG_ARCH_CHIP_STM32
+#include <up_arch.h>
+
+static const char mcu_ver_str[]		= "mcu";
+
+#define DBGMCU_IDCODE	0xE0042000
+
+#define STM32F40x_41x	0x413
+#define STM32F42x_43x	0x419
+
+#define REVID_MASK	0xFFFF0000
+#define DEVID_MASK	0xFFF
+
+/* magic numbers from reference manual */
+enum STM32F4_REV {
+	STM32F4_REV_A = 0x1000,
+	STM32F4_REV_Z = 0x1001,
+	STM32F4_REV_Y = 0x1003,
+	STM32F4_REV_1 = 0x1007,
+	STM32F4_REV_3 = 0x2001
+};
+#else
+#error stm32
+#endif
+
 static void usage(const char *reason)
 {
 	if (reason != NULL) {
 		printf("%s\n", reason);
 	}
 
-	printf("usage: ver {hw|hwcmp|git|bdate|gcc|all}\n\n");
+	printf("usage: ver {hw|hwcmp|git|bdate|gcc|all|mcu}\n\n");
 }
 
 __EXPORT int ver_main(int argc, char *argv[]);
@@ -107,6 +132,64 @@ int ver_main(int argc, char *argv[])
 				printf("GCC toolchain: %s\n", __VERSION__);
 				ret = 0;
 
+#ifdef CONFIG_ARCH_CHIP_STM32
+			} else if (!strncmp(argv[1], mcu_ver_str, sizeof(mcu_ver_str))) {
+				uint32_t abc = getreg32(DBGMCU_IDCODE);
+
+				uint32_t chip_version = abc & DEVID_MASK;
+				enum STM32F4_REV revid = (abc & REVID_MASK) >> 16;
+
+				printf("CHIP TYPE: ");
+
+				switch (revid) {
+				case STM32F40x_41x:
+					printf("STM32F40x");
+					break;
+				case STM32F42x_43x:
+					printf("STM32F42x");
+					break;
+				default:
+					printf("STM32F???");
+					break;
+				}
+
+				char rev;
+
+				switch (chip_version) {
+
+					case STM32F4_REV_A:
+						rev = 'A';
+						break;
+					case STM32F4_REV_Z:
+						rev = 'Z';
+						break;
+					case STM32F4_REV_Y:
+						rev = 'Y';
+						break;
+					case STM32F4_REV_1:
+						rev = '1';
+						break;
+					case STM32F4_REV_3:
+						rev = '3';
+						break;
+					default:
+						rev = '?';
+						break;
+				}
+
+				printf("\nHW REV: %c\n", rev);
+
+				if (rev < STM32F4_REV_3) {
+					printf("\n\nWARNING   WARNING   WARNING!\n"
+						"Revision %c has a silicon errata\n"
+						"on USB connectivity combined with\n"
+						"flash bank #2. This device can only\n"
+						"utilize a maximum of 1MB flash safely!\n"
+						"http://px4.io/help/errata\n", rev);
+				}
+				ret = 0;
+#endif
+
 			} else {
 				errx(1, "unknown command.\n");
 			}