[PV-GRUB DOC] Add details to PV-GRUB documentation

Add a couple of documentation details about PV-GRUB support

- the menu.lst content can be passed as a ramdisk.
- virtual partitions are not supported.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

diff --git a/README b/README
index 0dcce2a26d55b2f98ec500a21eb64850ff43965f..24fd847b794adb1ad6e7afd64166a3c3cd021a38 100644 (file)
--- a/README
+++ b/README
@@ -52,11 +52,17 @@ kernel = "pv-grub.gz"
 
 extra = "(hd0,0)/boot/grub/menu.lst"
 
-you can also use a tftp path (dhcp will be automatically performed):
+or you can provide the content of a menu.lst stored in dom0 by passing it as a
+ramdisk:
+
+ramdisk = "/boot/domU-1-menu.lst"
+
+or you can also use a tftp path (dhcp will be automatically performed):
 
 extra = "(nd)/somepath/menu.lst"
 
-or you can set it in option 150 of your dhcp server and leave extra empty
+or you can set it in option 150 of your dhcp server and leave extra and ramdisk
+empty (dhcp will be automatically performed)
 
 Limitations
 ===========
@@ -69,6 +75,13 @@ export XEN_TARGET_ARCH=x86_32
 - bootsplash is supported, but the ioemu backend does not yet support restart
 for use by the booted kernel.
 
+- PV-GRUB doesn't support virtualized partitions. For instance:
+
+disk = [ 'phy:hda7,hda7,w' ]
+
+will be seen by PV-GRUB as (hd0), not (hd0,6), since GRUB will not see any
+partition table.
+
 
                                 Your own stubdom
                                 ================