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    Subject[2.1.65] New patch for serial port IRQ setup.
    I've been made aware that some manufacturers of internal modems recommend
    using irq 2 for COM 4, while other recommende using irq 9. I've made this
    a configuration option.

    Please test this patch and let me know what you think.

    diff -urN linux-2.1.65/Documentation/Configure.help linux/Documentation/Configure.help
    --- linux-2.1.65/Documentation/Configure.help Mon Nov 24 03:35:58 1997
    +++ linux/Documentation/Configure.help Mon Nov 24 03:40:46 1997
    @@ -684,7 +684,10 @@
    CONFIG_SERIAL_SHARE_IRQ
    Some serial boards have hardware support which allows multiple dumb
    serial ports on the same board to share a single IRQ. To enable
    - support for this in the serial driver, say Y here.
    + support for this in the serial driver, say Y here. You also have to
    + say Y here if you want COM 1 and 2 to share interrupts with COM 3
    + and 4 respectively. Beware that it is not recommended to use two of
    + the first four serial ports with shared interrupts at the same time!

    Support special multiport boards
    CONFIG_SERIAL_MULTIPORT
    diff -urN linux-2.1.65/drivers/char/Config.in linux/drivers/char/Config.in
    --- linux-2.1.65/drivers/char/Config.in Mon Nov 24 03:35:39 1997
    +++ linux/drivers/char/Config.in Mon Nov 24 03:40:37 1997
    @@ -17,6 +17,9 @@
    bool ' Support the Bell Technologies HUB6 card' CONFIG_HUB6
    bool ' Console on serial port' CONFIG_SERIAL_CONSOLE
    fi
    +if [ "$CONFIG_SERIAL_SHARE_IRQ" != "y" ]; then
    + int 'IRQ for 4th serial port (COM4_IRQ) 2 or 9' COM4_IRQ 2
    +fi
    bool 'Non-standard serial port support' CONFIG_SERIAL_NONSTANDARD
    if [ "$CONFIG_SERIAL_NONSTANDARD" = "y" ]; then
    tristate 'Comtrol Rocketport support' CONFIG_ROCKETPORT
    diff -urN linux-2.1.65/drivers/char/serial.c linux/drivers/char/serial.c
    --- linux-2.1.65/drivers/char/serial.c Mon Nov 24 03:32:39 1997
    +++ linux/drivers/char/serial.c Mon Nov 24 03:43:56 1997
    @@ -22,6 +22,9 @@
    * 1/97: Extended dumb serial ports are a config option now.
    * Saves 4k. Michael A. Griffith <grif@acm.org>
    *
    + * 11/97: Configuration of shared IRQs between COM 1/3 and COM 2/4 via
    + * CONFIG_SERIAL_SHARE_IRQ. Niels Kristian Bech Jensen <nkbj@image.dk>
    + *
    * This module exports the following rs232 io functions:
    *
    * int rs_init(void);
    @@ -53,7 +56,7 @@
    #include <asm/bitops.h>

    static char *serial_name = "Serial driver";
    -static char *serial_version = "4.24";
    +static char *serial_version = "4.25";

    static DECLARE_TASK_QUEUE(tq_serial);

    @@ -94,6 +97,7 @@

    #define CONFIG_SERIAL_MANY_PORTS
    #define CONFIG_SERIAL_SHARE_IRQ
    +#define COM4_IRQ 2
    #define CONFIG_SERIAL_MULTIPORT
    #define CONFIG_HUB6
    #endif
    @@ -112,6 +116,9 @@
    #endif
    #ifndef CONFIG_SERIAL_SHARE_IRQ
    #define CONFIG_SERIAL_SHARE_IRQ
    +#ifndef COM4_IRQ
    +#define COM4_IRQ 2
    +#endif
    #endif
    #endif

    @@ -211,10 +218,17 @@

    static struct serial_state rs_table[] = {
    /* UART CLK PORT IRQ FLAGS */
    +#ifdef CONFIG_SERIAL_SHARE_IRQ
    { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */
    { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */
    { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */
    { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */
    +#else /* Default is no shared IRQs, remember to set up hardware */
    + { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */
    + { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */
    + { 0, BASE_BAUD, 0x3E8, 5, STD_COM_FLAGS }, /* ttyS2 */
    + { 0, BASE_BAUD, 0x2E8, COM4_IRQ, STD_COM4_FLAGS }, /* ttyS3 */
    +#endif /* CONFIG_SERIAL_SHARE_IRQ */
    #ifdef CONFIG_SERIAL_MANY_PORTS
    { 0, BASE_BAUD, 0x1A0, 9, FOURPORT_FLAGS }, /* ttyS4 */
    { 0, BASE_BAUD, 0x1A8, 9, FOURPORT_FLAGS }, /* ttyS5 */

    --
    Med venlig hilsen / Regards

    Niels Kristian Bech Jensen nkbj@image.dk
    http://www.image.dk/~nkbj/


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