Need to look at
java/nio/MappedByteBuffer/PmemTest.java

The vendor initially skipped it in JDK24 ATR - do we need to convert the default to be AMD64?

the PmemTest has two test runs, one for default OS and then alternative which has @ignore set

/* @test
 * @summary Testing NVRAM mapped byte buffer support
 * @run main/manual PmemTest
 * @requires (os.family == "linux")
 * @requires (os.arch == "x86_64")
 */

/* @test
 * @summary Testing NVRAM mapped byte buffer support
 * @run main/manual PmemTest
 * @requires (os.family == "linux")
 * @requires ((os.arch == "amd64")|(os.arch == "aarch64")|(os.arch == "ppc64le"))
 * @ignore The test described here is currently disabled on systems that are not
 * x64-based and lack an external NVRAM memory device. In order to re-enable the
 * test, you will need to mount the NVRAM device, which will typically appear as
 * /dev/pmem0, to the directory /mnt/pmem. Once that is done, you can follow the
 * instructions above to create a test directory and remove the ignore tag.
 */

As IMT default linux OS arch == amd64, the question is to either change the default run
/* @test
 * @summary Testing NVRAM mapped byte buffer support
 * @run main/manual PmemTest
 * @requires (os.family == "linux")
 * @requires (os.arch == "amd64")
 */

or revert to a single test, as was previously in place, deleting the first @test and removing the @ignore in the second.

/* @test
 * @summary Testing NVRAM mapped byte buffer support
 * @run main/manual PmemTest
 * @requires (os.family == "linux")
 * @requires ((os.arch == "amd64")|(os.arch == "aarch64")|(os.arch == "ppc64le")|(os.arch == "x86_64"))
 * In order to enable the
 * test, you will need to mount the NVRAM device, which will typically appear as
 * /dev/pmem0, to the directory /mnt/pmem. Once that is done, you can follow the
 * instructions above to create a test directory and remove the ignore tag.
 */