diff --git a/drivers/misc/ibmasm/uart.c b/drivers/misc/ibmasm/uart.c
index 7e98434cfa37..9783caf49696 100644
--- a/drivers/misc/ibmasm/uart.c
+++ b/drivers/misc/ibmasm/uart.c
@@ -50,7 +50,7 @@ void ibmasm_register_uart(struct service_processor *sp)
 	memset(&uport, 0, sizeof(struct uart_port));
 	uport.irq	= sp->irq;
 	uport.uartclk	= 3686400;
-	uport.flags	= UPF_AUTOPROBE | UPF_SHARE_IRQ;
+	uport.flags	= UPF_SHARE_IRQ;
 	uport.iotype	= UPIO_MEM;
 	uport.membase	= iomem_base;
 
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index ff2f931c6715..179c1f065e60 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -31,7 +31,6 @@
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/sysrq.h>
-#include <linux/mca.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/tty.h>
@@ -2026,12 +2025,6 @@ static void serial8250_config_port(struct uart_port *port, int flags)
 	int probeflags = PROBE_ANY;
 	int ret;
 
-	/*
-	 * Don't probe for MCA ports on non-MCA machines.
-	 */
-	if (up->port.flags & UPF_BOOT_ONLYMCA && !MCA_bus)
-		return;
-
 	/*
 	 * Find the region that we can probe for.  This in turn
 	 * tells us whether we can probe for the type of port.
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index ec351005bf9d..f3af47713a4e 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -245,9 +245,7 @@ struct uart_port {
 #define UPF_HARDPPS_CD		(1 << 11)
 #define UPF_LOW_LATENCY		(1 << 13)
 #define UPF_BUGGY_UART		(1 << 14)
-#define UPF_AUTOPROBE		(1 << 15)
 #define UPF_MAGIC_MULTIPLIER	(1 << 16)
-#define UPF_BOOT_ONLYMCA	(1 << 22)
 #define UPF_CONS_FLOW		(1 << 23)
 #define UPF_SHARE_IRQ		(1 << 24)
 #define UPF_BOOT_AUTOCONF	(1 << 28)