Boot Block in CE Boot (Compact 2013)
3/26/2014
The Boot Block driver is represented by an abstract class, BootBlock_t, that derives from BootDriver_t. This driver allows the boot loader to access a device’s persistent storage inside a logical disk partition, and exposes storage that has binary regions identified by a number (starting at 0). Reserved regions are identified by 16-character names, and partitions are identified by type and ordinal number. After the code opens a region or partition, it can use read, write, and erase commands to work with sectors within the region or partition. This operation is analogous to operations on a file that is opened by the CreateFile function of Windows Embedded Compact 2013.
The driver class of the Boot Block driver is BOOT_DRIVER_CLASS_BLOCK.
The Boot Block driver interface is defined in:
%_WINCEROOT%\Platform\Common\Src\Common\Bldr\Inc\BootBlock.hpp
The IOCTL codes to which a Boot Block driver can respond are listed in the following table.
Boot Block Driver IOCTLs
IOCTL |
Description |
|---|---|
BOOT_BLOCK_IOCTL_INFO |
Gets the following information from the store: Flags that indicate whether binary and reserved regions are supported, the sector size, the number of sectors, and the number of binary regions, reserved regions, and partitions. |
BOOT_BLOCK_IOCTL_FORMAT |
Formats the store. |
BOOT_BLOCK_IOCTL_LOCK_MODE |
Sets the store to a specified lock mode. |
BOOT_BLOCK_IOCTL_INFO_BINARY |
Gets the index and number of sectors in a binary region. |
BOOT_BLOCK_IOCTL_INFO_RESERVED |
Gets the index, name, and number of sectors in a reserved region. |
BOOT_BLOCK_IOCTL_INFO_PARTITION |
Gets the index, file system type, file system index, and number of sectors in a partition. |
BOOT_BLOCK_IOCTL_OPEN_BINARY |
Opens a binary region on the store and returns a handle to it. |
BOOT_BLOCK_IOCTL_OPEN_RESERVED |
Opens a reserved region on the store and returns a handle to it. |
BOOT_BLOCK_IOCTL_OPEN_PARTITION |
Opens a partition on the store and returns a handle to it. |
BOOT_BLOCK_IOCTL_READ |
Reads data from the store. |
BOOT_BLOCK_IOCTL_WRITE |
Writes data to the store. |
BOOT_BLOCK_IOCTL_ERASE |
Erases data from the store. |
Driver classes that derive from the Boot Block driver class are listed in the following table. Their interfaces are defined in:
%_WINCEROOT%\Platform\Common\Src\Common\Bldr\Block\<Class Name>
BootBlock Driver Derived Function Interface Files
Driver |
Class |
Description |
|---|---|---|
BIOS |
BootBlockBios_t |
Provides access to the BIOS of a device. |
FAL |
BootBlockFal_t |
Provides access to the flash abstraction layer (FAL) of a NAND flash device. |
Flash |
BootBlockFlash_t |
Provides access to a flash memory device. |
IDE |
BootBlockIde_t |
Provides access to an Integrated Device Electronics (IDE) device. |