qemuboot, xen-image-minimal: enable runqemu for qemuarm Xen images

The Xen hypervisor built for Arm 32-bit targets can be launched with
runqemu by providing a u-boot script and configuration for Qemu, which
enables interactive testing of Xen images.

Add qemuboot-xen-u-boot.bbclass to add a new bitbake task for generating
the u-boot script. Since this increases the number of qemuboot-specific
classes that are inherited by the xen-image-minimal recipe, change the
inherit of all of these to only apply to qemu machines with the qemuall
override.

Update qemuboot-xen-defaults.bbclass to supply working default
parameters for the qemuarm machine needed to boot successfully in
testing. Also change all the arch-specific variable overrides into
narrower qemu platform overrides instead to avoid unnecessary
interactions with other Arm platform machines.

Signed-off-by: Christopher Clark <christopher.clark@starlab.io>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/recipes-extended/images/xen-image-minimal.bb b/recipes-extended/images/xen-image-minimal.bb
index 3cf42300..9b7f4150 100644
--- a/recipes-extended/images/xen-image-minimal.bb
+++ b/recipes-extended/images/xen-image-minimal.bb
@@ -34,7 +34,11 @@ XEN_ACPI_PROCESSOR_MODULE:x86-64 = "kernel-module-xen-acpi-processor"
 
 LICENSE = "MIT"
 
-inherit core-image qemuboot-xen-defaults qemuboot-xen-dtb qemuboot-testimage-network
+inherit core-image
+# Only inherit the qemuboot classes when building for a qemu machine
+QB_QEMU_CLASSES = ""
+QB_QEMU_CLASSES:qemuall = "qemuboot-xen-defaults qemuboot-xen-dtb qemuboot-xen-u-boot qemuboot-testimage-network"
+inherit ${QB_QEMU_CLASSES}
 
 do_check_xen_state() {
     if [ "${@bb.utils.contains('DISTRO_FEATURES', 'xen', ' yes', 'no', d)}" = "no" ]; then