### Requirements and Considerations

Read the following information before beginning the installation of the Digi Neo driver.

Note: You must remove any previous versions of this driver before installing the new driver.

#### Hardware and Operating Systems Supported:

The Digi Neo driver for Linux is supported on the following hardware platforms:

- Standard i386/i486 and
- Pentium PC

The Linux distributions currently supported can be found in the Release Notes on the Digi Access Resource CD.

#### Installation Directory

The Digi Neo driver for Linux places the installation files in the /etc/digicpci directory. See man cpci and man dpa for more information.

The release notes are installed in different directories dependent on the Linux version being used. Enter the command rpm -q -d cpci to locate the release notes for your particular Linux version . The directory location and filenames are displayed.

#### Known limitations:

- For RedHat 7.0 and 7.1 you must use the kgcc compiler available with the RedHat distribution. The Linux default compiler gcc 2.96 does not compile the Digi Neo driver properly.
- The Linux tty subsystem is known to have throughput limitations. 460 kbps users can expect speed bottlenecks as a result of these limitations.
- SMP (symmetric multiprocessing) with 2.2.14 kernels and earlier experience a race condition in the Linux tty subsystem code, which causes buffer corruption problems. The Digi driver depends on the Linux tty subsystem to operate properly. SMP users must use a 2.2.15 or later kernel to properly install the driver.
  Uniprocessor users are not affected by this problem.