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#Name GenCfgOpt.py The python script that generates UPD text (.txt) files for the compiler, header files for the UPD regions, and generates a Boot Settings File (BSF), all from an EDK II Platform Description (DSC) file.

#Synopsis

GenCfgOpt UPDTXT PlatformDscFile BuildFvDir [TxtOutFile] [-D Macros]
GenCfgOpt HEADER PlatformDscFile BuildFvDir [InputHFile] [-D Macros]
GenCfgOpt GENBSF PlatformDscFile BuildFvDir BsfOutFile [-D Macros]

#Description GenCfgOpt.py is a script that generates configuration options from an EDK II Platform Description (DSC) file. It has three functions.

  1. It produces a .txt file that is used by the compiler that summarizes the UPD section in the DSC file.
  2. It generates header files for the UPD regions.
  3. It generates a Boot Settings File (BSF) that can be used by the Binary Configuration Tool (BCT) to provide a graphical user interface for manipulating settings in the UPD regions.

The GenCfgOpt.py script generates important files that are vital parts of your build process. The UPDTXT and HEADER use cases must be done before the 'build' command; the GENBSF use case may be done at any time.

The following sections explain the three use cases.

1. GenCfgOpt.py UPDTXT

The UPDTXT option creates a text file with all the UPD entries, offsets, size in bytes, and values. GenCfgOpt reads this information from the [PcdsDynamicVpd.Upd] section of the project's DSC file. The DSC file allows you to specify offsets and sizes for each entry, opening up the possibility of introducing gaps between entries. GenCfgOpt fills in these gaps with UPD entries that have the generic names UnusedUpdSpaceN where N begins with 0 and increments. The command signature for UPDTXT is:

GenCfgOpt UPDTXT PlatformDscFile BuildFvDir [TxtOutFile] [-D Macros]

PlatformDscFile must be the location of the DSC file for the platform you're building. BuildFvDir is the location where the binary will be stored. The optional TxtOutFile is a name and location for the output of GenCfgOpt. The default name and location is the <UPD_TOOL_GUID>.txt in the directory specified by BuildFvDir. The macro UPD_TOOL_GUID must be defined in the DSC file or in the optional Macros arguments. Each optional macro argument must follow the form ?D <MACRO_NAME>=<VALUE>.

GenCfgOpt checks to see if the UPD txt file has already been created and will only re-create it if the DSC was modified after it was created.

2. GenCfgOpt.py HEADER

The HEADER option creates header files in the build folder. Both header files define the _UPD_DATA_REGION data structures in FspUpd.h, FsptUpd.h, FspmUpd.h and FspsUpd.h. In these header files any undefined elements of structures will be added as ReservedUpdSpaceN beginning with N=0. The command signature for HEADER is

GenCfgOpt HEADER PlatformDscFile BuildFvDir [InputHFile] [-D Macros]

PlatformDscFile and BuildFvDir are described in the previous section. The optional InputHFile is a header file that may contain data definitions that are used by variables in the UPD regions. This header file must contain the special keywords !EXPORT EXTERNAL_BOOTLOADER_STRUCT_BEGIN and !EXPORT EXTERNAL_BOOTLOADER_STRUCT_END in comments. Everything between these two keywords will be included in the generated header file. The mechanism to specify whether a variable appears as ReservedUpdSpaceN in the FspUpd.h header file is in special commands that appear in the comments of the DSC file. The special commands begin with !HDR, for header. The following table summarizes the two command options.

HEADER

Use the HEADER command to hide specific variables in the public header file. In your project DSC file, use !HDR HEADER:{OFF} at the beginning of the section you wish to hide and !HDR HEADER:{ON} at the end.

STRUCT

The STRUCT command allows you to specify a specific data type for a variable. You can specify a pointer to a data struct, for example. You define the data structure in the InputHFile between !EXPORT EXTERNAL_BOOTLOADER_STRUCT_BEGIN and !EXPORT EXTERNAL_BOOTLOADER_STRUCT_END.

#####Example: !HDR STRUCT:{MY_DATA_STRUCT*}

You then define MY_DATA_STRUCT in InputHFile.

EMBED

The EMBED command allows you to put one or more UPD data into a specify data structure. You can utilize it as a group of UPD for example. You must specify a start and an end for the specify data structure.

#####Example:

  !HDR EMBED:{MY_DATA_STRUCT:MyDataStructure:START}
  gTokenSpaceGuid.Upd1  | 0x0020 | 0x01 | 0x00
  gTokenSpaceGuid.Upd2  | 0x0021 | 0x01 | 0x00
  !HDR EMBED:{MY_DATA_STRUCT:MyDataStructure:END}
  gTokenSpaceGuid.UpdN  | 0x0022 | 0x01 | 0x00

#####Result:

  typedef struct {
    /** Offset 0x0020
    **/
    UINT8                     Upd1;
    /** Offset 0x0021
    **/
    UINT8                     Upd2;
    /** Offset 0x0022
    **/
    UINT8                     UpdN;
  } MY_DATA_STRUCT;

  typedef struct _UPD_DATA_REGION {
    ...
    /** Offset 0x0020
    **/
    MY_DATA_STRUCT    MyDataStruct;
    ...
  } UPD_DATA_REGION;

3. GenCfgOpt .py GENBSF

The GENBSF option generates a BSF from the UPD entries in a package's DSC file. It does this by parsing special commands found in the comments of the DSC file. They roughly match the keywords that define the different sections of the BSF.

The command signature for GENBSF is

GenCfgOpt GENBSF PlatformDscFile BuildFvDir BsfOutFile [-D Macros]

In this case, the BsfOutFile parameter is required; it should be the relative path to where the BSF should be stored.

Every BSF command in the DSC file begins with !BSF or @Bsf. The following table summarizes the options that come after !BSF or @Bsf:

BSF Commands Description

###PAGES PAGES maps abbreviations to friendly-text descriptions of the pages in a BSF.

#####Example: !BSF PAGES:{PG1:?Page 1?, PG2:?Page 2?} or

@Bsf PAGES:{PG1:?Page 1?, PG2:?Page 2?}

###PAGE This marks the beginning of a page. Use the abbreviation specified in PAGES command.

#####Example: !BSF PAGE:{PG1} or

@Bsf PAGE:{PG1}

All the entries that come after this command are assumed to be on that page, until the next PAGE command

###FIND FIND maps to the BSF Find command. It will be placed in the StructDef region of the BSF and should come at the beginning of the UPD sections of the DSC, immediately before the signatures that mark the beginning of these sections. The content should be the plain-text equivalent of the signature. The signature is usually 8 characters.

#####Example: !BSF FIND:{PROJSIG1} or

@Bsf FIND:{PROJSIG1}

###BLOCK The BLOCK command maps to the BeginInfoBlock section of the BSF. There are two elements: a version number and a plain-text description.

#####Example: !BSF BLOCK:{NAME:"My platform name", VER:"0.1"} or

@Bsf BLOCK:{NAME:"My platform name", VER:"0.1"}

###NAME NAME gives a plain-text for a variable. This is the text label that will appear next to the control in BCT.

#####Example: !BSF NAME:{Variable 0} or

@Bsf NAME:{Variable 0}

If the !BSF NAME or @Bsf NAME command does not appear before an entry in the UPD region of the DSC file, then that entry will not appear in the BSF.

###TYPE The TYPE command is used either by itself or with the NAME command. It is usually used by itself when defining an EditNum field for the BSF. You specify the type of data in the second parameter and the range of valid values in the third.

#####Example: !BSF TYPE:{EditNum, HEX, (0x00,0xFF)} or

@Bsf TYPE:{EditNum, HEX, (0x00,0xFF)}

TYPE appears on the same line as the NAME command when using a combo-box.

#####Example: !BSF NAME:{Variable 1} TYPE:{Combo} or @Bsf NAME:{Variable 1} TYPE:{Combo}

There is a special None type that puts the variable in the StructDef region of the BSF, but doesn't put it in any Page section. This makes the variable visible to BCT, but not to the end user.

###HELP The HELP command defines what will appear in the help text for each control in BCT.

#####Example: !BSF HELP:{Enable/disable LAN controller.} or

@Bsf HELP:{Enable/disable LAN controller.}

###OPTION The OPTION command allows you to custom-define combo boxes and map integer or hex values to friendly-text options.

#####Example: !BSF OPTION:{0:IDE, 1:AHCI, 2:RAID}

!BSF OPTION:{0x00:0 MB, 0x01:32 MB, 0x02:64 MB}

or

@Bsf OPTION:{0:IDE, 1:AHCI, 2:RAID}

@Bsf OPTION:{0x00:0 MB, 0x01:32 MB, 0x02:64 MB}

###FIELD The FIELD command can be used to define a section of a consolidated PCD such that the PCD will be displayed in several fields via BCT interface instead of one long entry.

#####Example: !BSF FIELD:{PcdDRAMSpeed:1} or

@Bsf FIELD:{PcdDRAMSpeed:1}

###ORDER The ORDER command can be used to adjust the display order for the BSF items. By default the order value for a BSF item is assigned to be the UPD item (Offset * 256). It can be overridden by declaring ORDER command using format ORDER: {HexMajor.HexMinor}. In this case the order value will be (HexMajor*256+HexMinor). The item order value will be used as the sort key during the BSF item display.

#####Example: !BSF ORDER:{0x0040.01} or

@Bsf ORDER:{0x0040.01}

For OPTION and HELP commands, it allows to split the contents into multiple lines by adding multiple OPTION and HELP command lines. The lines except for the very first line need to start with + in the content to tell the tool to append this string to the previous one.

For example, the statement

!BSF OPTION:{0x00:0 MB, 0x01:32 MB, 0x02:64 MB}

is equivalent to:

!BSF OPTION:{0x00:0 MB, 0x01:32 MB,}

!BSF OPTION:{+ 0x02:64 MB}

or

@Bsf OPTION:{0x00:0 MB, 0x01:32 MB, 0x02:64 MB}

is equivalent to:

@Bsf OPTION:{0x00:0 MB, 0x01:32 MB,}

@Bsf OPTION:{+ 0x02:64 MB}

The NAME, OPTION, TYPE, and HELP commands can all appear on the same line following the !BSF or @Bsf keyword or they may appear on separate lines to improve readability.

There are four alternative ways to replace current BSF commands.

1. # @Prompt

An alternative way replacing NAME gives a plain-text for a variable. This is the text label that will appear next to the control in BCT.

#####Example: # @Prompt Variable 0

The above example can replace the two methods as below.

!BSF NAME:{Variable 0} or

@Bsf NAME:{Variable 0}

If the # @Prompt command does not appear before an entry in the UPD region of the DSC file, then that entry will not appear in the BSF.

2. ##

An alternative way replacing HELP command defines what will appear in the help text for each control in BCT.

#####Example: ## Enable/disable LAN controller.

The above example can replace the two methods as below.

!BSF HELP:{Enable/disable LAN controller.} or

@Bsf HELP:{Enable/disable LAN controller.}

3. # @ValidList

An alternative way replacing OPTION command allows you to custom-define combo boxes and map integer or hex values to friendly-text options.

#####Example:

                   Error Code | Options | Descriptions

The above example can replace the two methods as below.

!BSF OPTION:{0:IDE, 1:AHCI, 2:RAID} or

@Bsf OPTION:{0:IDE, 1:AHCI, 2:RAID}

4. # @ValidRange

An alternative way replace EditNum field for the BSF.

#####Example:

                    Error Code | Range

The above example can replace the two methods as below.

!BSF TYPE:{EditNum, HEX, (0x00,0xFF)} or

@Bsf TYPE:{EditNum, HEX, (0x00,0xFF)}