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Subject[PATCH 3/5] serial: delete the MCA specific 8250 support.
The support for CONFIG_MCA is being removed, since the 20
year old hardware simply isn't capable of meeting today's
software demands on CPU and memory resources.

This commit removes the MCA specific 8250 UART code.

Cc: Alan Cox <>
Cc: Greg Kroah-Hartman <>
Signed-off-by: Paul Gortmaker <>
Documentation/serial/stallion.txt | 22 ++++++------
drivers/tty/serial/8250/8250_mca.c | 61 ------------------------------------
drivers/tty/serial/8250/Kconfig | 9 -----
drivers/tty/serial/8250/Makefile | 1 -
include/linux/serial.h | 2 -
include/linux/serial_8250.h | 1 -
6 files changed, 11 insertions(+), 85 deletions(-)
delete mode 100644 drivers/tty/serial/8250/8250_mca.c

diff --git a/Documentation/serial/stallion.txt b/Documentation/serial/stallion.txt
index 5509091..4d798c0 100644
--- a/Documentation/serial/stallion.txt
+++ b/Documentation/serial/stallion.txt
@@ -20,10 +20,10 @@ There are two drivers that work with the different families of Stallion
multiport serial boards. One is for the Stallion smart boards - that is
EasyIO, EasyConnection 8/32 and EasyConnection 8/64-PCI, the other for
the true Stallion intelligent multiport boards - EasyConnection 8/64
-(ISA, EISA, MCA), EasyConnection/RA-PCI, ONboard and Brumby.
+(ISA, EISA), EasyConnection/RA-PCI, ONboard and Brumby.

If you are using any of the Stallion intelligent multiport boards (Brumby,
-ONboard, EasyConnection 8/64 (ISA, EISA, MCA), EasyConnection/RA-PCI) with
+ONboard, EasyConnection 8/64 (ISA, EISA), EasyConnection/RA-PCI) with
Linux you will need to get the driver utility package. This contains a
firmware loader and the firmware images necessary to make the devices operate.

@@ -40,7 +40,7 @@ If you are using the EasyIO, EasyConnection 8/32 or EasyConnection 8/64-PCI
boards then you don't need this package, although it does have a serial stats
display program.

-If you require DIP switch settings, EISA or MCA configuration files, or any
+If you require DIP switch settings, or EISA configuration files, or any
other information related to Stallion boards then have a look at Stallion's
web pages at

@@ -51,13 +51,13 @@ web pages at
The drivers can be used as loadable modules or compiled into the kernel.
You can choose which when doing a "config" on the kernel.

-All ISA, EISA and MCA boards that you want to use need to be configured into
+All ISA, and EISA boards that you want to use need to be configured into
the driver(s). All PCI boards will be automatically detected when you load
the driver - so they do not need to be entered into the driver(s)
configuration structure. Note that kernel PCI support is required to use PCI

-There are two methods of configuring ISA, EISA and MCA boards into the drivers.
+There are two methods of configuring ISA and EISA boards into the drivers.
If using the driver as a loadable module then the simplest method is to pass
the driver configuration as module arguments. The other method is to modify
the driver source to add configuration lines for each board in use.
@@ -71,12 +71,12 @@ That makes things pretty simple to get going.

The simplest configuration for modules is to use the module load arguments
-to configure any ISA, EISA or MCA boards. PCI boards are automatically
+to configure any ISA or EISA boards. PCI boards are automatically
detected, so do not need any additional configuration at all.

-If using EasyIO, EasyConnection 8/32 ISA or MCA, or EasyConnection 8/63-PCI
+If using EasyIO, EasyConnection 8/32 ISA, or EasyConnection 8/63-PCI
boards then use the "stallion" driver module, Otherwise if you are using
-an EasyConnection 8/64 ISA, EISA or MCA, EasyConnection/RA-PCI, ONboard,
+an EasyConnection 8/64 ISA or EISA, EasyConnection/RA-PCI, ONboard,
Brumby or original Stallion board then use the "istallion" driver module.

Typically to load up the smart board driver use:
@@ -146,7 +146,7 @@ on each system boot. Typically configuration files are put in the

For static driver configuration you need to modify the driver source code.
-Entering ISA, EISA and MCA boards into the driver(s) configuration structure
+Entering ISA and EISA boards into the driver(s) configuration structure
involves editing the driver(s) source file. It's pretty easy if you follow
the instructions below. Both drivers can support up to 4 boards. The smart
card driver (the stallion.c driver) supports any combination of EasyIO and
@@ -157,7 +157,7 @@ supports any combination of ONboards, Brumbys, Stallions and EasyConnection
To set up the driver(s) for the boards that you want to use you need to
edit the appropriate driver file and add configuration entries.

-If using EasyIO or EasyConnection 8/32 ISA or MCA boards,
+If using EasyIO or EasyConnection 8/32 ISA boards,
In drivers/char/stallion.c:
- find the definition of the stl_brdconf array (of structures)
near the top of the file
@@ -243,7 +243,7 @@ change it on the board.
On EasyIO and EasyConnection 8/32 boards the IRQ is software programmable, so
if there is a conflict you may need to change the IRQ used for a board. There
are no interrupts to worry about for ONboard, Brumby or EasyConnection 8/64
-(ISA, EISA and MCA) boards. The memory region on EasyConnection 8/64 and
+(ISA and EISA) boards. The memory region on EasyConnection 8/64 and
ONboard boards is software programmable, but not on the Brumby boards.

diff --git a/drivers/tty/serial/8250/8250_mca.c b/drivers/tty/serial/8250/8250_mca.c
deleted file mode 100644
index d20abf0..0000000
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 591f801..175c204 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -241,15 +241,6 @@ config SERIAL_8250_RSA
::: To be written :::

-config SERIAL_8250_MCA
- tristate "Support 8250-type ports on MCA buses"
- depends on SERIAL_8250 != n && MCA
- help
- Say Y here if you have a MCA serial ports.
- To compile this driver as a module, choose M here: the module
- will be called 8250_mca.
config SERIAL_8250_ACORN
tristate "Acorn expansion card serial port support"
depends on ARCH_ACORN && SERIAL_8250
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 867bba7..464320f 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -15,6 +15,5 @@ obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o
obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
-obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o
obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
diff --git a/include/linux/serial.h b/include/linux/serial.h
index 441980e..90e9f98 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -130,7 +130,6 @@ struct serial_uart_config {
#define ASYNCB_CHECK_CD 25 /* i.e., CLOCAL */
#define ASYNCB_SHARE_IRQ 24 /* for multifunction cards, no longer used */
#define ASYNCB_CONS_FLOW 23 /* flow control for console */
-#define ASYNCB_BOOT_ONLYMCA 22 /* Probe only if MCA bus */

@@ -166,7 +165,6 @@ struct serial_uart_config {

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 8f012f8..6c5047d 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -54,7 +54,6 @@ enum {

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