r1879 - trunk/packages/initramfs

alexander at linuxfromscratch.org alexander at linuxfromscratch.org
Mon May 7 07:30:02 PDT 2007


Author: alexander
Date: 2007-05-07 08:30:02 -0600 (Mon, 07 May 2007)
New Revision: 1879

Modified:
   trunk/packages/initramfs/README
Log:
More bytes that can be modified


Modified: trunk/packages/initramfs/README
===================================================================
--- trunk/packages/initramfs/README	2007-05-07 14:25:03 UTC (rev 1878)
+++ trunk/packages/initramfs/README	2007-05-07 14:30:02 UTC (rev 1879)
@@ -1,16 +1,20 @@
 The fakecd.iso.head file is stored in pregenerated binary form in order
 to avoid breakage that can be caused by new cdrtools. Append a single
-file compressed by mkzftree to it, and adjust DWORDs at offsets mentioned below
+file compressed by mkzftree to it, and adjust bytes at offsets mentioned below
 in order to get a valid iso image containing that single file as /root.ext2.
 
-DWORDs to change:
+bytess to change:
 
-Offset 0x8050: volume size in 2K blocks, little-endian
-Offset 0x8054: volume size in 2K blocks, big-endian
-Offset 0xb8f8: compressed length, little-endian
-Offset 0xb8fc: compressed length, big-endian
-Offset 0xb973: uncompressed length, little-endian
-Offset 0xb977: uncompressed length, big-endian
+Offset 0x8050, DWORD: volume size in 2K blocks, little-endian
+Offset 0x8054, DWORD: volume size in 2K blocks, big-endian
+Offset 0xb8f8, DWORD: compressed length, little-endian
+Offset 0xb8fc, DWORD: compressed length, big-endian
+Offset 0xb971, BYTE:  compression header size (>> 2)
+Offset 0xb972, BYTE:  compression block size (log2)
+Offset 0xb973, DWORD: uncompressed length, little-endian
+Offset 0xb977, DWORD: uncompressed length, big-endian
 
 Uncompressed length can be found at offset 8 in the compressed file, in the
-little-endian form.
+little-endian form. Bytes indicating compression header size and compression
+block size can be copied from the compressed file from offsets 12 and 13
+(decimal), respectively.




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