selftest/devtool: change write to append config in virtual_kernel_modify

When uses write it creates a full new configuration in selftest.inc
causing to fail populate_sdk_ext linux-yocto because the signature
of the sstate changes.

[YOCTO #11300]

(From OE-Core rev: 65bab9210be51aeb431ea85c90e31ad9f0d2340c)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/lib/oeqa/selftest/devtool.py b/meta/lib/oeqa/selftest/devtool.py
index 57048665c0..39f3543417 100644
--- a/meta/lib/oeqa/selftest/devtool.py
+++ b/meta/lib/oeqa/selftest/devtool.py
@@ -1635,7 +1635,7 @@ class DevtoolTests(DevtoolBase):
         #Set machine to qemxu86 to be able to modify the kernel and
         #verify the modification.
         features = 'MACHINE = "qemux86"\n'
-        self.write_config(features)
+        self.append_config(features)
         kernel_provider = get_bb_var('PREFERRED_PROVIDER_virtual/kernel')
         # Clean up the enviroment
         bitbake('%s -c clean' % kernel_provider)