making hello-world run on all Boards

libwrap/sys/write.c

@@ -21,6 +21,10 @@ ssize_t __wrap_write(int fd, const void* ptr, size_t len)
                 while (uart_get_tx_free(uart)==0) ;
                 uart_write(uart, '\r');
             }
+#elif defined(BOARD_iss)
+            *((uint32_t*) 0xFFFF0000) = current[jj];
+#elif defined(BOARD_TGC5L)
+            //TODO: implement
 #else
             while (UART0_REG(UART_REG_TXFIFO) & 0x80000000) ;
             UART0_REG(UART_REG_TXFIFO) = current[jj];