[Xen-devel] [PATCH v6 05/20] osstest: introduce a helper to setup a host to boot using memdisk

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

The helper allows booting a host from pxelinux using an image
compatible with memdisk.

Note that this requires having a copy of the memdisk binary (provided
as part of pxelinux) in the root of the tftp server.

Deployment note: A copy of the memdisk binary (from syslinux) must be
placed in the root of the tftp server, on Debian this is accomplished
using;

ln -s /usr/lib/syslinux/memdisk /tftp/root/memdisk

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
Changes since v4:
 - Add a deployment note to the commit message.

Changes since v3:
 - New in this version (split from install patch).
---
 Osstest/TestSupport.pm | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/Osstest/TestSupport.pm b/Osstest/TestSupport.pm
index 12ebc32d..66790575 100644
--- a/Osstest/TestSupport.pm
+++ b/Osstest/TestSupport.pm
@@ -122,7 +122,7 @@ BEGIN {
                       await_webspace_fetch_byleaf create_webfile
                       file_link_contents get_timeout
                       setup_netboot_di setup_netboot_local host_netboot_file
-                     subst_netboot_template
+                      subst_netboot_template setup_netboot_memdisk
 
                       ether_prefix
 
@@ -2629,6 +2629,26 @@ default local
 END
 }
 
+sub setup_netboot_memdisk ($$) {
+    my ($ho, $img) = @_;
+    setup_netboot_bootcfg($ho, <<END);
+serial 0 $c{Baud}
+timeout 5
+label overwrite
+        menu label ^Overwrite
+        menu default
+        kernel memdisk
+        initrd $img
+        # NB: according to the memdisk syslinux wikipage [0]
+        # adding "append raw" is required in order to boot on
+        # some boxes, and in fact some hardware will not boot
+        # without it.
+        # [0] 
http://www.syslinux.org/wiki/index.php?title=MEMDISK#Memory_access_method
+        append raw
+default overwrite
+END
+}
+
 # uboot emulates pxelinux, so reuse BIOS stuff
 sub setup_netboot_di_uboot ($$$$$;%) { return &setup_netboot_di_bios; }
 sub setup_netboot_local_uboot ($) { return &setup_netboot_local_bios; }
-- 
2.11.0 (Apple Git-81)


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