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3. Resolving Installation and Configuration Problems

The following sections list solutions to possible problems you may experience.

3.1. DSP Does Not Start

In order to recognize memory above 64 Meg, it may be necessary to append the "mem=" option to the kernel command line. If you are using LILO for your boot loader, you would do this in the lilo.conf file. For example, if you had a machine with 128 Meg you would type:

append="mem=130496K"
Note NOTE
 

Your statement must reflect 576K less than you actually have. Specifying the full amount of memory will prevent the DSP from starting. In the above example, the formula used to arrive at the proper number was 1024 * nMB - 576 = nK.

If you forget to run the Thinkpad™ utility to enable the ACP Modem and you didn't specify any command line arguments when inserting the mwave module (or it didn't work), you will receive a message in the syslog, similar to the one below:

ACP Modem, UART settings IRQ 0x3       IO 0x2f8

tp3780::EnableDSP, pSettings->bDSPEnabled 0 failed

Mwave Modem, ERROR cannot Enable DSP error fffffffb

Mwave Modem, ERROR cannot perform Mwave Initialization retval fffffffb

If you receive a message like the one above, check the command line arguments you provided to insmod.

3.2. Resource Conflicts

The ACP Modem requires the use of system resources for both the DSP and the UART provided by the ACP chip. For Linux systems, you will specify parameters to use for the duration of the boot with the insmod mwave command line parameters listed in Section 2.4.1.

Typically the configured resources are:

For the DSP:  IRQ 10, I/O address 0x130-0x13f

For the UART: IRQ 3,  I/O address 0x2f8 (if using ttyS1)

                                  IRQ 4,  I/O address 0x3f8 (if using ttyS0)

For dual boot systems we recommeded that you use the Thinkpad™ Configuration Utility on Windows NT or DOS to configure these system resources.

Windows NT Thinkpad Configuration Utility Notes: (Under the Internal Modem --> Advanced selection)

  1. Set IRQ sharing to disabled

  2. Set 1st IRQ to your DSP IRQ (10 is recommened)

  3. Set 2nd IRQ to your UART IRQ (i.e. ttyS1 is equivalent to COM2)

  4. Set the DSP I/O address (0x130 is recommended)

  5. Set the internal modem I/O address to the UART I/O address (i.e. 0x2f8 for COM2)

  6. The DMA address is unused and can be set to anything.

Note NOTE
 

You may also specify parameters to use for the duration of the boot by using the insmod mwave line parameters listed in section Section 2.4.1.