all devices / spiInterface / main: added method / infra to detect flash chip with --detect -f

src/altera.hpp

@@ -46,6 +46,12 @@ class Altera: public Device, SPIInterface {
 		/*     spi interface     */
 		/*************************/
 
+		/*!
+		 * \brief display SPI flash ID and status register
+		 */
+		bool detect_flash() override {
+			return SPIInterface::detect_flash();
+		}
 		/*!
 		 * \brief protect SPI flash blocks
 		 */