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--- doc:appunti:linux:sa:if_rename [2024/06/21 17:49] – [Beware of initramfs image] niccolo
+++ doc:appunti:linux:sa:if_rename [2024/06/21 17:54] (current) – [Beware of initramfs image] niccolo
@@ Line 41: / Line 41: @@
 === How to unpack the iniramfs image to inspect its content ===
-In Debian 12 the iniramfs image is composed by a cpio archive containing the Intel microcode followed by the Zstandard compressed cpio archive of the initramfs. To extract both, do the following:
+In **Debian 12** the iniramfs image may be composed by two appended cpio archives. The first containing the Intel microcode in //ASCII cpio archive// format, and the second containing the actual initramfs as a //Zstandard compressed cpio archive//. To extract both, do the following:
+Extract **the microcode part** (take note of the number of blocks printed on stderr):
-Extract the microcode (take note of the number of blocks printed on stderr):
 <code>
@@ Line 51: / Line 50: @@
 </code>
-Make a copy of initramfs stripping the microcode and decompress it:
+Make a copy of **the initramfs part** stripping the microcode and decompress it:
 <code>
-dd if=/boot/initrd.img-6.1.0-21-amd64 of=initramfs.img.zstd bs=512 skip=14080
+dd if=/boot/initrd.img-6.1.0-21-amd64 of=initramfs.img.zst bs=512 skip=14080
-unzstd initramfs.img.zstd --stdout | cpio --extract --make-directories  --no-absolute-filenames
+unzstd initramfs.img.zst --stdout | cpio --extract --make-directories  --no-absolute-filenames
 </code>