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Microsoft Windows Logo Program System and Device Requirements  —  26

of LBA.

A1.1.4.13 Provide boot support for USB keyboards and hubs

For USB host controllers that provide only internally-accessible USB ports and that are not connected to a keyboard or hub: such controllers are not required to provide boot support for keyboards and hubs. If a downstream keyboard is attached to such a host controller, the keyboard and any intermediate hubs must be supported at boot time.

See “Server Note” at A1.4.3 for systems that provide headless server support.

A1.1.4.13.1 BIOS handles long descriptors read from USB device attached at boot time. When a USB host requests the configuration descriptor for a device, the device returns the configuration descriptor, all interface descriptors, and endpoint descriptors for all interfaces in a single request (see section 9.4.3 of the USB 1.1 specification). The maximum size of the returned data is 64 KB.

To enumerate the USB and configure boot devices, the BIOS must make a configuration request to every device encountered. Therefore, the BIOS must be capable of handling a maximum length descriptor if such a descriptor is returned. However, the BIOS is required to configure only boot devices. Nonboot devices can be left in the addressed USB-visible device state.

A1.1.4.13.2 BIOS provides boot support for USB keyboards and hubs. This BIOS support, as defined in Universal Serial Bus (USB) Device Class Definition for Human Interface Devices (HID), Version 1.1, with particular attention to the Keyboard Boot Protocol, must provide the ability for the user to enter the BIOS setup utility and also provide enough functionality to install and boot an operating system that recognizes USB peripherals. USB keyboards built as stand-alone devices, part of a composite device, or part of a compound device must all be recognized and usable. The BIOS is required to support keyboards behind at least two levels of external hubs.

A1.1.4.13.3 For systems with multiple USB host controllers, BIOS support for USB keyboards and hubs is required for all host controllers that are integrated on the system board (that is, not add-on cards).

A1.1.4.13.4 Keyboard and pointing devices must be functional for all modes of the operating system, including booting, loading, safe mode, and operating system setup and installation.

A1.1.4.13.5 USB external connectors and USB input device support must be enabled by default in the BIOS, and the BIOS must make USB input devices, such as keyboards and pointing devices, available at boot time.

A1.1.4.14 If bootable ATAPI devices are included in the system, firmware support complies with ATAPI Removable Media Device BIOS Specification 1.0 and ATA/ATAPI-5

ATA BIOS or option ROM must provide boot support for the primary ATA Packet Interface (ATAPI) bootable floppy disk drive in compliance with ATAPI Removable Media Device BIOS Specification, Version 1.0. Complying with this specification provides Int 13h and Int 40h support for bootable floppy drives as the primary or secondary floppy disk device.

The system BIOS must configure the drive and host controller so they are optimized for ATA operation. The programmed I/O mode must continue to work. The ATA/ATAPI device driver must also support restoration of these settings using the ACPI control methods _GTM, _STM, and _GTF when the ATA controller is power managed across a suspend and resume cycle.

The AT Attachment with Packet Interface – 5 (ATA/ATAPI-5) standard defines the enumeration process for all ATAPI devices.

A1.1.4.16 x86-based client: For a system board that supports a riser card, provide a unique identifier for the riser

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