tests/functional: Add a ppc64 mac99 test

The test sequence boots from disk a mac99 machine in 64-bit mode, in
which case the CPU is a PPC 970.

The buildroot rootfs is built with config :

BR2_powerpc64=y
BR2_powerpc_970=y

and the kernel with the g5 deconfig.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-ID: <20250128212145.1186617-1-clg@redhat.com>
[thuth: Adjusted the comment about '-nographic]
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/test_ppc64_mac99.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+#
+# Functional test that boots a mac99 machine with a PPC970 CPU
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from qemu_test import LinuxKernelTest, Asset
+from qemu_test import exec_command_and_wait_for_pattern
+
+class mac99Test(LinuxKernelTest):
+
+    ASSET_BR2_MAC99_LINUX = Asset(
+        'https://github.com/legoater/qemu-ppc-boot/raw/refs/heads/main/buildroot/qemu_ppc64_mac99-2023.11-8-gdcd9f0f6eb-20240105/vmlinux',
+        'd59307437e4365f2cced0bbd1b04949f7397b282ef349b7cafd894d74aadfbff')
+
+    ASSET_BR2_MAC99_ROOTFS = Asset(
+        'https://github.com/legoater/qemu-ppc-boot/raw/refs/heads/main//buildroot/qemu_ppc64_mac99-2023.11-8-gdcd9f0f6eb-20240105/rootfs.ext2',
+        'bbd5fd8af62f580bc4e585f326fe584e22856572633a8333178ea6d4ed4955a4')
+
+    def test_ppc64_mac99_buildroot(self):
+        self.set_machine('mac99')
+
+        linux_path = self.ASSET_BR2_MAC99_LINUX.fetch()
+        rootfs_path = self.ASSET_BR2_MAC99_ROOTFS.fetch()
+
+        self.vm.set_console()
+
+        # Note: We need '-nographic' to get a serial console
+        self.vm.add_args('-kernel', linux_path,
+                         '-append', 'root=/dev/sda',
+                         '-drive', f'file={rootfs_path},format=raw',
+                         '-snapshot', '-nographic')
+        self.vm.launch()
+
+        self.wait_for_console_pattern('>> OpenBIOS')
+        self.wait_for_console_pattern('Linux version')
+        self.wait_for_console_pattern('/init as init process')
+        self.wait_for_console_pattern('gem 0000:f0:0e.0 eth0: Link is up at 100 Mbps')
+        self.wait_for_console_pattern('buildroot login:')
+        exec_command_and_wait_for_pattern(self, 'root', '#')
+        exec_command_and_wait_for_pattern(self, 'poweroff', 'Power down')
+
+if __name__ == '__main__':
+    LinuxKernelTest.main()