s390: specify offset and size of the initrd for booting from CD

For booting with an initramfs initrd we apparently need to specify its
offset and size at specific memory locations. Backported from trunk.

Change is based on SuSE's CD boot. Many thanks to Adam Thornton, Mark Post
(of Novell) and Bastian Blank for providing the pointers to the missing bits.

lenny/data/lenny/s390/d390.ins

@@ -1,4 +1,6 @@
 * Debian GNU/Linux for S/390 (boot from CD-ROM or FTP-Server)
 linux_vm 0x00000000
+root.off 0x0001040c
+root.siz 0x00010414
 parmfile 0x00010480
 root.bin 0x00800000

lenny/data/lenny/s390/d390oco.ins

@@ -1,5 +1,7 @@
 * Debian GNU/Linux for S/390 (boot from CD-ROM or FTP-Server with OCO-Modules)
 linux_vm 0x00000000
+root.off 0x0001040c
+root.siz 0x00010414
 parmfile 0x00010480
 root.bin 0x00800000
 oco.bin 0x00c00000

lenny/debian/changelog

@@ -2,6 +2,9 @@ debian-cd (3.1.1lenny1) UNRELEASED; urgency=low
 
   [ Frans Pop ]
   * sparc: display message for unsupported subarchitectures.
+  * s390: Add boot files specifying offset and size of the initrd for booting
+    from CD. Change is based on SuSE's CD boot. Many thanks to Adam Thornton,
+    Mark Post and Bastian Blank for providing the pointers to the missing bits.
 
   [ Steve McIntyre ]
   * Fix link in README.html.in for lenny. (#542191)

lenny/tools/boot/lenny/boot-s390

@@ -87,6 +87,10 @@ done
 # - d390oco.tdf : same, using object-code-only-modules-ramdisk (example)
 cp $BASEDIR/data/$CODENAME/s390/d390* "$imagedir/"
 
+# Create the files specifying offset and size of the initrd
+perl -e "print pack('N', 0x800000)" >"$imagedir/root.off"
+perl -e "print pack('N', -s '$imagedir/root.bin')" >"$imagedir/root.siz"
+
 # Copy the README file
 cp $BASEDIR/data/$CODENAME/s390/README.boot "boot$N/"