sync yaboot stuff with d-i changes:

- add expert mode
  - mount devfs on boot

data/sarge/yaboot/boot.msg

@@ -1,20 +1,14 @@
-Welcome to Debian GNU/Linux sarge!
+Welcome to Debian GNU/Linux ${DEBIAN_VERSION}!
 
 In addition to the default 'install' option, 
 there is 'install-safe' which you should try if 
 the system fails to boot at all (the typical
 symptom is a white screen which doesn't go away).
 
+For maximum control, you can use the'expert'
+and 'expert-safe' options.
+
 ************************************
 If in doubt, just choose 'install', and if that 
 doesn't work, try 'install-safe'.
 ************************************
-
-You may add the desired debconf priority after
-'install', for example
-
-boot: install DEBCONF_PRIORITY=medium
-
-The default priority is high; medium priority
-will result in a more 'manual' menu-driven
-installer experience.

data/sarge/yaboot/yaboot.conf

@@ -12,7 +12,14 @@ message=/install/powermac/boot.msg
 image=/install/powermac/vmlinux
 	label=install
 	initrd=/install/powermac/root.bin
-	append="init=/linuxrc"
+	append="DEBCONF_PRIORITY=low devfs=mount,dall init=/linuxrc"
+	initrd-size=8192
+	read-only
+
+image=/install/powermac/vmlinux
+	label=expert
+	initrd=/install/powermac/root.bin
+	append="devfs=mount,dall init=/linuxrc"
 	initrd-size=8192
 	read-only
 
@@ -21,5 +28,12 @@ image=/install/powermac/vmlinux
 	label=install-safe
 	initrd=/install/powermac/root.bin
 	initrd-size=8192
-	append="video=ofonly init=/linuxrc"
+	append="devfs=mount,dall video=ofonly init=/linuxrc"
+	read-only
+
+image=/install/powermac/vmlinux
+	label=expert-safe
+	initrd=/install/powermac/root.bin
+	initrd-size=8192
+	append="DEBCONF_PRIORITY=low devfs=mount,dall video=ofonly init=/linuxrc"
 	read-only

debian/changelog

@@ -17,8 +17,8 @@ debian-cd (2.2.17) UNRELEASED; urgency=low
       uses dhcp-client-udeb.
     - Add appropriate kernel-pcmcia-modules package to
       debian-installer+kernel task for i386.
-    - Update the yaboot boot.msg to match the one in d-i cvs, including
-      details about setting debconf priority.
+    - Update the yaboot boot.msg to match the one in d-i cvs.
+    - Update the yaboot.conf to add expert and expert-safe boot modes.
     - Link the d-i INSTALLATION-HOWTO into doc/, if it exists.
     - Add my exclude_udebs lists, for general and i386, and modify
       generate_di_list to not include udebs from those lists onto the