Initramfs - Revision history

Uwe at 16:35, 19 September 2010

2010-09-19T16:35:58Z

Stepan at 23:45, 9 October 2008

2008-10-09T23:45:01Z

Stepan at 21:51, 9 October 2008

2008-10-09T21:51:49Z

Stuge: whitespace

2008-10-09T19:52:47Z

whitespace

Stuge: improve formatting and grammar a little

2008-10-09T19:25:30Z

improve formatting and grammar a little

Stuge at 23:51, 6 August 2008

2008-08-06T23:51:04Z

Stuge: phrasing

2008-08-06T23:45:47Z

phrasing

Stuge at 23:44, 6 August 2008

2008-08-06T23:44:16Z

Stuge: Fix objcopy --add-section to work also when the section already exists.

2008-08-06T23:43:36Z

Fix objcopy --add-section to work also when the section already exists.

Stuge: How to inject an initramfs into a vmlinux.

2008-08-06T22:40:11Z

How to inject an initramfs into a vmlinux.

New page

How to inject a separate initramfs file into a 2.6 vmlinux: (as section .init.ramfs)

First turn the initramfs into an ELF, excluding anything but the file data:

objcopy -I binary -O elf32-i386 -B i386 --redefine-sym _binary_initramfs_start=.init.ramfs -N _binary_initramfs_end -N _binary_initramfs_size initramfs initramfs.elf

Note that the symbol names _binary_initramfs_{start,end,size} depend on the input filename. objcopy does some translation here, e.g. a period (.) in the filename will become an underscore (_) in the symbols.

Now add the .init.ramfs section from initramfs.elf into the vmlinux file:

objcopy -I elf32-i386 -O elf32-i386 --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs

All done.

@@ Line 1: / Line 1: @@
-How to inject a gzipped initramfs cpio file into vmlinux as section '''.init.ramfs''':
+This page describes how to inject a gzipped initramfs cpio file into vmlinux as section '''.init.ramfs''':
-. Turn the initramfs into an ELF binary, excluding everything but the file data:
+Firs, turn the initramfs into an ELF binary, excluding everything but the file data:
- objcopy -I binary -O elf32-i386 -B i386 --redefine-sym _binary_initramfs_start=.init.ramfs -N _binary_initramfs_end -N _binary_initramfs_size initramfs initramfs.elf
-Note that the symbol names _binary_initramfs_{start,end,size} above depend on the input filename. objcopy does some translation so e.g. a period (.) in the filename becomes an underscore (_) in the symbol names.
-. Remove any previous .init.ramfs section in vmlinux and add the new one from initramfs.elf:
+  $ '''objcopy -I binary -O elf32-i386 -B i386 --redefine-sym _binary_initramfs_start=.init.ramfs -N _binary_initramfs_end -N _binary_initramfs_size initramfs initramfs.elf'''
-  objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
-. Done! Please test using '''vmlinux.withnewinitramfs''' as payload with coreboot and let us know the result!
+Note that the symbol names '''_binary_initramfs_{start,end,size}''' above depend on the input filename. objcopy does some translation so e.g. a period (.) in the filename becomes an underscore (_) in the symbol names. Then, remove any previous '''.init.ramfs''' section in vmlinux and add the new one from '''initramfs.elf''':

← Older revision		Revision as of 23:45, 9 October 2008
Line 8:		Line 8:
	objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs		objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs

−	3. Done! Please test using vmlinux.withnewinitramfs as payload with coreboot and let us know the result!	+	3. Done! Please test using '''vmlinux.withnewinitramfs''' as payload with coreboot and let us know the result!

← Older revision		Revision as of 21:51, 9 October 2008
Line 1:		Line 1:
−	How to inject a gzipped initramfs cpio file into vmlinux as section .init.ramfs:	+	How to inject a gzipped initramfs cpio file into vmlinux as section '''.init.ramfs''':

	1. Turn the initramfs into an ELF binary, excluding everything but the file data:		1. Turn the initramfs into an ELF binary, excluding everything but the file data:

@@ Line 6: / Line 6: @@
 . Remove any previous .init.ramfs section in vmlinux and add the new one from initramfs.elf:
-    objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
+ objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
 . Done! Please test using vmlinux.withnewinitramfs as payload with coreboot and let us know the result!

@@ Line 1: / Line 1: @@
-How to inject a separate gzipped initramfs cpio file into vmlinux as section .init.ramfs.
+How to inject a gzipped initramfs cpio file into vmlinux as section .init.ramfs:
-First turn the initramfs into an ELF, excluding everything but the file data:
+. Turn the initramfs into an ELF binary, excluding everything but the file data:
+ objcopy -I binary -O elf32-i386 -B i386 --redefine-sym _binary_initramfs_start=.init.ramfs -N _binary_initramfs_end -N _binary_initramfs_size initramfs initramfs.elf
-    objcopy -I binary -O elf32-i386 -B i386 --redefine-sym _binary_initramfs_start=.init.ramfs -N _binary_initramfs_end -N _binary_initramfs_size initramfs initramfs.elf
+Note that the symbol names _binary_initramfs_{start,end,size} above depend on the input filename. objcopy does some translation so e.g. a period (.) in the filename becomes an underscore (_) in the symbol names.
-−
-Note that the symbol names _binary_initramfs_{start,end,size} above depend on the input filename. objcopy does some translation here, e.g. a period (.) in the filename will become an underscore (_) in the symbols.
-−
-Now remove any existing .init.ramfs section in vmlinux and add the one in initramfs.elf:
      objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
-All done.
+. Done! Please test using vmlinux.withnewinitramfs as payload with coreboot and let us know the result!

← Older revision		Revision as of 23:51, 6 August 2008
Line 1:		Line 1:
−	How to inject a separate initramfs file into vmlinux as section .init.ramfs.	+	How to inject a separate gzipped initramfs cpio file into vmlinux as section .init.ramfs.

	First turn the initramfs into an ELF, excluding everything but the file data:		First turn the initramfs into an ELF, excluding everything but the file data:

@@ Line 1: / Line 1: @@
-How to inject a separate initramfs file into a 2.6 vmlinux: (as section .init.ramfs)
+How to inject a separate initramfs file into a 2.6 vmlinux (as section .init.ramfs):
 First turn the initramfs into an ELF, excluding anything but the file data:
@@ Line 7: / Line 7: @@
 Note that the symbol names _binary_initramfs_{start,end,size} depend on the input filename. objcopy does some translation here, e.g. a period (.) in the filename will become an underscore (_) in the symbols.
-Now add the .init.ramfs section from initramfs.elf into the vmlinux file:
+Now remove any existing .init.ramfs section in vmlinux and add the section in initramfs.elf:
-     objcopy -I elf32-i386 -O elf32-i386 --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
+     objcopy -I elf32-i386 -O elf32-i386 -R .init.ramfs --add-section .init.ramfs=initramfs.elf vmlinux vmlinux.withnewinitramfs
 All done.