Add functional test for RISC-V big-endian.

Signed-off-by: Djordje Todorovic <djordje.todorovic@htecgroup.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 tests/functional/riscv64/meson.build       |  1 +
 tests/functional/riscv64/test_bigendian.py | 57 ++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 tests/functional/riscv64/test_bigendian.py

diff --git a/tests/functional/riscv64/meson.build b/tests/functional/riscv64/meson.build
index b996c89d7d..d06d6ea112 100644
--- a/tests/functional/riscv64/meson.build
+++ b/tests/functional/riscv64/meson.build
@@ -11,6 +11,7 @@ tests_riscv64_system_quick = [
 ]
 
 tests_riscv64_system_thorough = [
+  'bigendian',
   'boston',
   'sifive_u',
   'tuxrun',
diff --git a/tests/functional/riscv64/test_bigendian.py b/tests/functional/riscv64/test_bigendian.py
new file mode 100644
index 0000000000..9e0b3b7db5
--- /dev/null
+++ b/tests/functional/riscv64/test_bigendian.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+#
+# Functional tests for RISC-V big-endian support
+#
+# Copyright (c) 2026 MIPS
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from qemu_test import QemuSystemTest, Asset
+from qemu_test import wait_for_console_pattern
+
+
+class RiscvBigEndian(QemuSystemTest):
+    """
+    Tests for RISC-V runtime big-endian data support.
+
+    Uses a bare-metal RV64 ELF that detects data endianness at runtime
+    by storing a 32-bit word and reading back byte 0. Prints "ENDIAN: BE"
+    or "ENDIAN: LE" to the NS16550A UART on the virt machine.
+    """
+
+    timeout = 10
+
+    ASSET_BE_TEST = Asset(
+        'https://github.com/MIPS/linux-test-downloads/raw/main/'
+        'riscvbe-baremetal/be-test-bare-metal.elf',
+        '9ad51b675e101de65908fadbac064ed1d0564c17463715d09dd734db86ea0f58')
+
+    def _run_bare_metal(self, big_endian=False):
+        self.set_machine('virt')
+        kernel = self.ASSET_BE_TEST.fetch()
+        self.vm.add_args('-bios', 'none')
+        self.vm.add_args('-kernel', kernel)
+        if big_endian:
+            self.vm.add_args('-cpu', 'rv64,big-endian=on')
+        self.vm.set_console()
+        self.vm.launch()
+        expected = 'ENDIAN: BE' if big_endian else 'ENDIAN: LE'
+        wait_for_console_pattern(self, expected)
+
+    def test_bare_metal_littleendian(self):
+        """
+        Boot bare-metal ELF on virt with default little-endian CPU.
+        Expects "ENDIAN: LE" on UART.
+        """
+        self._run_bare_metal(big_endian=False)
+
+    def test_bare_metal_bigendian(self):
+        """
+        Boot bare-metal ELF on virt with big-endian=on CPU property.
+        Expects "ENDIAN: BE" on UART.
+        """
+        self._run_bare_metal(big_endian=True)
+
+
+if __name__ == '__main__':
+    QemuSystemTest.main()
-- 
2.34.1