tests/avocado: Make the test_arm_bpim2u_gmac test more reliable

The test_arm_bpim2u_gmac test sometimes fails (ca. 1 out of 20 runs
here) since the disk shows up as /dev/mmcblk1 instead of /dev/mmcblk0
in some runs. No matter of the name in /dev, the major:minor encoding
seems always to be the same, so we can fix this issue by using the
correct major:minor hex number in the "root=" parameter instead.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230630161604.446394-1-thuth@redhat.com>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230630180423.558337-18-alex.bennee@linaro.org>
diff --git a/tests/avocado/boot_linux_console.py b/tests/avocado/boot_linux_console.py
index 6ed6606..6eab515 100644
--- a/tests/avocado/boot_linux_console.py
+++ b/tests/avocado/boot_linux_console.py
@@ -869,7 +869,7 @@
         self.vm.set_console()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
                                'console=ttyS0,115200 '
-                               'root=/dev/mmcblk0 rootwait rw '
+                               'root=b300 rootwait rw '
                                'panic=-1 noreboot')
         self.vm.add_args('-kernel', kernel_path,
                          '-dtb', dtb_path,
@@ -885,7 +885,7 @@
         exec_command_and_wait_for_pattern(self, 'cat /proc/cpuinfo',
                                                 'Allwinner sun8i Family')
         exec_command_and_wait_for_pattern(self, 'cat /proc/partitions',
-                                                'mmcblk0')
+                                                'mmcblk')
         exec_command_and_wait_for_pattern(self, 'ifconfig eth0 up',
                                                  'eth0: Link is Up')
         exec_command_and_wait_for_pattern(self, 'udhcpc eth0',