HOTFIX: disable interrupt-driven I2C mode, configure pessimistic I2C timeout, correct handling of the NAK generation for I2C master reads.

This looks like it addresses the recent I2C lockup issue, unfortunately it also increases CPU consumption by ~5% for the I2C sensor bus.

apps/systemcmds/eeprom/eeprom.c

@@ -73,6 +73,7 @@ static void	eeprom_erase(void);
 static void	eeprom_ioctl(unsigned operation);
 static void	eeprom_save(const char *name);
 static void	eeprom_load(const char *name);
+static void	eeprom_test(void);
 
 static bool attached = false;
 static bool started = false;
@@ -93,6 +94,9 @@ int eeprom_main(int argc, char *argv[])
 		if (!strcmp(argv[1], "erase"))
 			eeprom_erase();
 
+		if (!strcmp(argv[1], "test"))
+			eeprom_test();
+
 		if (0) {	/* these actually require a file on the filesystem... */
 
 			if (!strcmp(argv[1], "reformat"))
@@ -250,3 +254,12 @@ eeprom_load(const char *name)
 
 	exit(0);
 }
+
+extern void at24c_test(void);
+
+static void
+eeprom_test(void)
+{
+	at24c_test();
+	exit(0);
+}