Legacy Usb Support - Intel S875WP1LX Specification

S875WP1-E TPS
Non-Plug and Play operating systems, such as Windows NT, require an additional interface for
obtaining the SMBIOS information. The BIOS supports an SMBIOS table interface for such
operating systems. Using this support, an SMBIOS service-level application running on a
non-Plug and Play operating system can obtain the SMBIOS information.
6.4

Legacy USB Support

Legacy USB support enables USB devices such as keyboard, mice, and hubs to be used even
when the operating system's USB drivers are not yet available. Legacy USB support is used to
access the BIOS Setup program, and to install an operating system that supports USB. By
default, Legacy USB support is set to Enabled.
Legacy USB support operates as follows:
1. When the user applies power to the computer, legacy support is disabled.
2. POST begins.
3. Legacy USB support is enabled by the BIOS allowing the user to use a USB keyboard to
enter and configure the BIOS Setup program and the maintenance menu.
4. POST completes.
5. The operating system loads. While the operating system is loading, USB keyboard and
mice are recognized and may be used to configure the operating system. (Keyboard and
mice are not recognized during this period if Legacy USB support was set to disabled in
the BIOS Setup program.)
6. After the operating system loads the USB drivers, all legacy and non-legacy USB
devices are recognized by the operating system, and Legacy USB support from the
BIOS is no longer used.
To install an operating system that supports USB, verify that Legacy USB support in the BIOS
Setup program is set to Enabled and follow the operating system's installation instructions.
NOTE
Legacy USB support is for keyboard, mice, and hubs only. Other USB devices are not
supported in legacy mode.
Revision 4.0
BIOS Features
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