NXP平台，uboot下用mtest测试内存报错是什么原因？

NXP平台，uboot下用mtest测试内存报错是什么原因？
=> mtest 0x80000000 0xd0000000
Testing 80000000 ... d0000000:
Iteration:      1
FAILURE (read/write) @ 0xa0037000: expected 0x04006e01, actual 0x5004006e41)

FAILURE (read/write) @ 0xa0037008: expected 0x04006e02, actual 0x1004006e02)

FAILURE (read/write) @ 0xa0037010: expected 0x04006e03, actual 0x5004006e13)

FAILURE (read/write) @ 0xa0037018: expected 0x04006e04, actual 0x1004006e14)

FAILURE (read/write) @ 0xa0037020: expected 0x04006e05, actual 0x5004006e45)

FAILURE (read/write) @ 0xa0037028: expected 0x04006e06, actual 0x5004006e56)

FAILURE (read/write) @ 0xa0037030: expected 0x04006e07, actual 0x1004006e17)

FAILURE (read/write) @ 0xa0037038: expected 0x04006e08, actual 0x1004006e18)

FAILURE (read/write) @ 0xa0037040: expected 0x04006e09, actual 0x1004006e59)

FAILURE (read/write) @ 0xa0037048: expected 0x04006e0a, actual 0x04006e1a)

FAILURE (read/write) @ 0xa0037050: expected 0x04006e0b, actual 0x1004006e1b)

FAILURE (read/write) @ 0xa0037058: expected 0x04006e0c, actual 0x1004006e0c)

FAILURE (read/write) @ 0xa0037060: expected 0x04006e0d, actual 0x5004006e5d)

FAILURE (read/write) @ 0xa0037068: expected 0x04006e0e, actual 0x4004006e5e)

FAILURE (read/write) @ 0xa0037070: expected 0x04006e0f, actual 0x1004006e0f)

FAILURE (read/write) @ 0xa0037078: expected 0x04006e10, actual 0x1004006e10)

FAILURE (read/write) @ 0xa0037080: expected 0x04006e11, actual 0x4004006e51)

FAILURE (read/write) @ 0xa0037088: expected 0x04006e12, actual 0x1004006e42)