Specifications

216 Version 2.0

BBS_DEVICE

BBS_BBS NONE Don’t process.

A.3.1 Get the MTD

The MTD is a string that carries device’s media info. Such as floppy, hard disk or

others. The MTD is a string that makes the mapping more readable.

Now, the MTD has four types: fp(floppy), hd(hard disk), cd(CD Rom) and f(unknown

type).

The MTD’s info come from the device path. the algorithm go through each node of the

device path to find the special node that can specify this device’s MTD.

Table 29 MTD Naming

TYPE SUBTYPE MTD

EDIA_DEVICE_PATH MEDIA_HARDDRIVE hd

EDIA_DEVICE_PATH MEDIA_CDROM cd

ACPI_DEVICE_PATH ACPI &HID=0x0604 fp

Note: If a device has the MEDIA_HARDDRIVE and MEDIA_CDROM device path node,

then its MTD is cd.

If a device path has no any node list on the table, then, its MTD is f(unknown).

A.3.2 Get the HI

Each device can be separated into two part: the HI part and CSD part.

The HI part is used to get the HI section in the consistent mapping.

The CSD part is used to get the CSD section in the consistent mapping.

The algorithm of get HI goes through each device path in the system and extracts

each HI node in the device path according Table 28 to create a HI device path.

A.3.3 Get the CSD

A device path remove the HI device path part, the remain part is the CSD part.

The algorithm is go through the CSD device part, to each node, according Table 28

et the data that will be add to the CSD, translate the data to a string of digital or

character(according the position in the CSD).

A.3.3.1 USB Devices

CSD of hard drive device path node

Use partition number and interface for CSD