LeapFrog Pollux Platform: File Format CBF - Revision history

Jrspruitt: /* File Differences */

2012-10-15T06:00:34Z

‎File Differences

2012-02-04T00:01:22Z

2012-02-03T22:49:32Z

‎File Structure

2012-02-03T22:44:57Z

‎File Differences

2012-02-03T22:39:31Z

2012-02-03T22:27:58Z

2012-02-03T21:41:07Z

2012-02-03T21:37:17Z

‎Description

2012-02-03T21:36:38Z

‎Versions

2012-02-03T21:35:42Z

‎Description

@@ Line 74: / Line 74: @@
 |LeapPad
 |Surgeon.cbf
-|0x00008000
+|0x00010000
-|0x00008000
+|0x00010000
 |True
 |True

← Older revision		Revision as of 00:01, 4 February 2012
Line 1:		Line 1:
−	== ~~Description~~ ==	+	== Summary ==
	The LeapFrog [[Leapster Explorer]] and [[LeapPad Explorer]] both use the CBF file format for the kernel firmware and Surgeon. This is a rather basic format, that contains some summary information about the kernel, size, load address, etc. This information is all rather easy to obtain out of the file, with a hex editor. You can also extract the zImage or Image of the kernel if desired or use the python script in the [[LeapFrog_Pollux_Platform:_Source_Code \| LeapFrog Sources]].		The LeapFrog [[Leapster Explorer]] and [[LeapPad Explorer]] both use the CBF file format for the kernel firmware and Surgeon. This is a rather basic format, that contains some summary information about the kernel, size, load address, etc. This information is all rather easy to obtain out of the file, with a hex editor. You can also extract the zImage or Image of the kernel if desired or use the python script in the [[LeapFrog_Pollux_Platform:_Source_Code \| LeapFrog Sources]].

@@ Line 33: / Line 33: @@
 |-
-| Magic Number
+| Magic Number(1)
 | CBF Version
 | Kernel Load
 | Kernel Jump
 | Kernel Size
-| CRC32 Checksum
+| CRC Checksum(2)
 | Kernel Image
-| CRC32 Checksum
+| CRC Checksum(2)
 | 0xFF
 |}
 == File Differences ==

@@ Line 54: / Line 54: @@
 !| compressed
 !| initramfs
 |-
@@ Line 62: / Line 63: @@
 |False
 |False
 |-
@@ Line 70: / Line 72: @@
 |True
 |True
 |-
@@ Line 78: / Line 81: @@
 |True
 |False
 |-
@@ Line 86: / Line 90: @@
 |True
 |True
 |}
 == make_cbf.py ==

@@ Line 9: / Line 9: @@
 [[LeapFrog_Pollux_Platform:_OpenLFConnect | OpenLFConnect]]
@@ Line 70: / Line 42: @@
 | CRC32 Checksum
 | 0xFF
 |}
@@ Line 83: / Line 99: @@
 ''' Usage '''
-The script graps the zImage or Image file, depending on version from <kernel>/arch/arm/boot/[Image|zImage] and wraps in with the CBF information, they use their own CRC routine in calculating the checksum. There is three options, of which only two look valid. -c deletes a previous kernel.cbf file, and -o specifies the output files name (default, kernel.cbf).
 [[Category:LeapFrog Pollux Platform]]

@@ Line 1: / Line 1: @@
 == Description ==
-The LeapFrog [[Leapster Explorer]] and [[LeapPad Explorer]] both use the CBF file format for the kernel firmware and Surgeon. This is a rather basic format, that contains some summary information about the kernel, size, load address, etc. This information is all rather easy to obtain out of the file, with a hex editor. You can also extract the zImage or Image of the kernel if desired. You can create your own cbf file a couple of ways.
+The LeapFrog [[Leapster Explorer]] and [[LeapPad Explorer]] both use the CBF file format for the kernel firmware and Surgeon. This is a rather basic format, that contains some summary information about the kernel, size, load address, etc. This information is all rather easy to obtain out of the file, with a hex editor. You can also extract the zImage or Image of the kernel if desired or use the python script in the [[LeapFrog_Pollux_Platform:_Source_Code | LeapFrog Sources]].
-LeapFrog includes the Python script to turn a kernel image into a cbf file <Sources>/scripts/make_cbf.py.
+== Programs ==
 == File Structure ==
@@ Line 42: / Line 72: @@
 |}
 [[Category:LeapFrog Pollux Platform]]

@@ Line 7: / Line 7: @@
 == make_cbf.py ==
-There are two versions of the make_cbf.py script, starting with source release [[LeapFrog_Pollux_Platform:_Source_Code#LeapPad_Explorer | 20110602]] for the LeapPad, the cbf is built with an uncompressed kernel Image, instead of a gunzip compressed zImage. There is no indicator of this, other than a change to the Python script. There is a reference to a different version in this release's Surgeon script, referring to a make_compressed_cbf.py script. Which would seem to indicate Surgeon is built with the older version.
+There are two versions of the make_cbf.py script, starting with source release [[LeapFrog_Pollux_Platform:_Source_Code#LeapPad_Explorer | 20110602]] for the LeapPad, the cbf is built with an uncompressed kernel Image, instead of a gunzip compressed zImage. There is no indicator of this, other than a change to the Python script. There is a reference to a different version in this release's Surgeon script, referring to a make_compressed_cbf.py script. Which would seem to indicate Surgeon is built with the older version. This is also confirmed by the kernel_jump and kernel_load addresses, the lastest make_cbf.py script has the values 0x8000 while the older version has 0x10000, which is the value actually used in Surgeon Lpad and Explorer still.
 == File Structure ==

@@ Line 6: / Line 6: @@
 [[LeapFrog_Pollux_Platform:_OpenLFConnect | OpenLFConnect]] can't create a cbf file, unwrap its contents, or give a summary of the cbf information.
-== Versions ==
+== make_cbf.py ==
 There are two versions of the make_cbf.py script, starting with source release [[LeapFrog_Pollux_Platform:_Source_Code#LeapPad_Explorer | 20110602]] for the LeapPad, the cbf is built with an uncompressed kernel Image, instead of a gunzip compressed zImage. There is no indicator of this, other than a change to the Python script. There is a reference to a different version in this release's Surgeon script, referring to a make_compressed_cbf.py script. Which would seem to indicate Surgeon is built with the older version.