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AM6442: LPDDR4 memory test fails under low temperature

Part Number: AM6442

Hi,

My customer is testing LPDDR4 write/read/compare stress tests with different temperatures on their custom board.
The test fails at 0C, -5C and -10C and failing bit is always the same.

Examples:
-10C: FAILURE (read/write) @ 0x9fbcf838: expected 0x03f79f08, actual 0x03ff9f08)
-5C: FAILURE (read/write) @ 0x85bba838: expected 0x00b77508, actual 0x00bf7508)
0C: FAILURE (read/write) @ 0x87be6838: expected 0x00f7cd08, actual 0x00ffcd08)

No failure is observed under 5C, 25C and 60C.
The customer tested two boards and both boards are failing in the same manner.
Reducing the clock from 667MHz to 553MHz does not help.

Here are failing logs just FYI.

U-Boot SPL 2021.01-00001-g911f54274e-dirty (Mar 17 2022 - 17:36:26 +0900)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
SPL initial stack usage: 13392 bytes
Trying to boot from MMC2
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.5(release):08.00.00.004-dirty
NOTICE:  BL31: Built : 10:51:05, Mar 22 2022

U-Boot SPL 2021.01-00001-g911f54274e-dirty (Aug 01 2022 - 15:40:15 +0900)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
Trying to boot from MMC2


U-Boot 2021.01-00001-g911f54274e-dirty (Aug 01 2022 - 15:40:15 +0900)

SoC:   AM64X SR1.0
Model: Texas Instruments AM642 EVM
DRAM:  1 GiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from SPIFlash... SF: Detected s25fl512s with page size 512 Bytes, erase size 256 KiB, total 64 MiB
*** Warning - bad CRC, using default environment

In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Found i2c device at bus: 0x01 addr: 0x50
testdata[16]: 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
Net:   eth0: ethernet@8000000
Hit any key to stop autoboot:  2  1  0 
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
1583 bytes read in 2 ms (772.5 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Running uenvcmd ...
Testing 80000000 ... bd000000:
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1639Iteration:   1640Iteration:   1641Iteration:   1642Iteration:   1643Iteration:   1644Iteration:   1645Iteration:   1646Iteration:   1647Iteration:   1648Iteration:   1649Iteration:   1650Iteration:   1651Iteration:   1652Iteration:   1653Iteration:   1654Iteration:   1655Iteration:   1656Iteration:   1657Iteration:   1658Iteration:   1659Iteration:   1660Iteration:   1661Iteration:   1662Iteration:   1663Iteration:   1664Iteration:   1665Iteration:   1666Iteration:   1667Iteration:   1668Iteration:   1669Iteration:   1670Iteration:   1671Iteration:   1672Iteration:   1673Iteration:   1674Iteration:   1675Iteration:   1676Iteration:   1677Iteration:   1678Iteration:   1679Iteration:   1680Iteration:   1681Iteration:   1682Iteration:   1683Iteration:   1684Iteration:   1685Iteration:   1686Iteration:   1687Iteration:   1688Iteration:   1689Iteration:   1690Iteration:   1691Iteration:   1692Iteration:   1693Iteration:   1694Iteration:   1695Iteration:   1696Iteration:   1697Iteration:   1698Iteration:   1699Iteration:   1700Iteration:   1701Iteration:   1702Iteration:   1703Iteration:   1704Iteration:   1705Iteration:   1706Iteration:   1707Iteration:   1708Iteration:   1709Iteration:   1710Iteration:   1711Iteration:   1712Iteration:   1713Iteration:   1714Iteration:   1715Iteration:   1716Iteration:   1717Iteration:   1718Iteration:   1719Iteration:   1720Iteration:   1721Iteration:   1722Iteration:   1723Iteration:   1724Iteration:   1725
FAILURE (read/write) @ 0x85bba838: expected 0x00b77508, actual 0x00bf7508)

FAILURE (read/write) @ 0x85bdb838: expected 0x00b7b708, actual 0x00bfb708)

FAILURE (read/write) @ 0x85bf3838: expected 0x00b7e708, actual 0x00bfe708)

FAILURE (read/write) @ 0x87b97838: expected 0x00f72f08, actual 0x00ff2f08)

FAILURE (read/write) @ 0x87bb2838: expected 0x00f76508, actual 0x00ff6508)

FAILURE (read/write) @ 0x87bbe838: expected 0x00f77d08, actual 0x00ff7d08)

FAILURE (read/write) @ 0x87bbf838: expected 0x00f77f08, actual 0x00ff7f08)

FAILURE (read/write) @ 0x87bdf038: expected 0x00f7be08, actual 0x00ffbe08)

FAILURE (read/write) @ 0x87be7038: expected 0x00f7ce08, actual 0x00ffce08)

FAILURE (read/write) @ 0x87bec838: expected 0x00f7d908, actual 0x00ffd908)

FAILURE (read/write) @ 0x87bee838: expected 0x00f7dd08, actual 0x00ffdd08)

FAILURE (read/write) @ 0x87bf7838: expected 0x00f7ef08, actual 0x00ffef08)

FAILURE (read/write) @ 0x8dbf7038: expected 0x01b7ee08, actual 0x01bfee08)

FAILURE (read/write) @ 0x8fb98838: expected 0x01f73108, actual 0x01ff3108)

FAILURE (read/write) @ 0x8fba1838: expected 0x01f74308, actual 0x01ff4308)

FAILURE (read/write) @ 0x8fbb0838: expected 0x01f76108, actual 0x01ff6108)

FAILURE (read/write) @ 0x8fbbc838: expected 0x01f77908, actual 0x01ff7908)

FAILURE (read/write) @ 0x8fbd7838: expected 0x01f7af08, actual 0x01ffaf08)

FAILURE (read/write) @ 0x8fbda838: expected 0x01f7b508, actual 0x01ffb508)

FAILURE (read/write) @ 0x8fbe9838: expected 0x01f7d308, actual 0x01ffd308)

FAILURE (read/write) @ 0x8fbfb838: expected 0x01f7f708, actual 0x01fff708)

FAILURE (read/write) @ 0x8fbfc838: expected 0x01f7f908, actual 0x01fff908)

FAILURE (read/write) @ 0x8fbff038: expected 0x01f7fe08, actual 0x01fffe08)

FAILURE (read/write) @ 0x97b96838: expected 0x02f72d08, actual 0x02ff2d08)

FAILURE (read/write) @ 0x97b9f838: expected 0x02f73f08, actual 0x02ff3f08)

FAILURE (read/write) @ 0x97bbe038: expected 0x02f77c08, actual 0x02ff7c08)

FAILURE (read/write) @ 0x97bc3838: expected 0x02f78708, actual 0x02ff8708)

FAILURE (read/write) @ 0x97bcb838: expected 0x02f79708, actual 0x02ff9708)

FAILURE (read/write) @ 0x97bdb038: expected 0x02f7b608, actual 0x02ffb608)

FAILURE (read/write) @ 0x97bff838: expected 0x02f7ff08, actual 0x02ffff08)

FAILURE (read/write) @ 0x9dbd2038: expected 0x03b7a408, actual 0x03bfa408)

FAILURE (read/write) @ 0x9dbd7838: expected 0x03b7af08, actual 0x03bfaf08)

FAILURE (read/write) @ 0x9ebaf838: expected 0x03d75f08, actual 0x03df5f08)

FAILURE (read/write) @ 0x9fbaf838: expected 0x03f75f08, actual 0x03ff5f08)

FAILURE (read/write) @ 0x9fbb5838: expected 0x03f76b08, actual 0x03ff6b08)

FAILURE (read/write) @ 0x9fbd3838: expected 0x03f7a708, actual 0x03ffa708)

FAILURE (read/write) @ 0x9fbdf838: expected 0x03f7bf08, actual 0x03ffbf08)

FAILURE (read/write) @ 0x9fbfc038: expected 0x03f7f808, actual 0x03fff808)

FAILURE (read/write) @ 0x9fbfd038: expected 0x03f7fa08, actual 0x03fffa08)

FAILURE (read/write) @ 0xa7bad038: expected 0x04f75a08, actual 0x04ff5a08)

FAILURE (read/write) @ 0xa7bbf038: expected 0x04f77e08, actual 0x04ff7e08)

FAILURE (read/write) @ 0xa7bc5838: expected 0x04f78b08, actual 0x04ff8b08)

FAILURE (read/write) @ 0xa7bcb038: expected 0x04f79608, actual 0x04ff9608)

FAILURE (read/write) @ 0xa7bdd038: expected 0x04f7ba08, actual 0x04ffba08)

FAILURE (read/write) @ 0xa7be3838: expected 0x04f7c708, actual 0x04ffc708)

FAILURE (read/write) @ 0xa7bef838: expected 0x04f7df08, actual 0x04ffdf08)

FAILURE (read/write) @ 0xa7bf9038: expected 0x04f7f208, actual 0x04fff208)

FAILURE (read/write) @ 0xa7bfe838: expected 0x04f7fd08, actual 0x04fffd08)

FAILURE (read/write) @ 0xadbbf838: expected 0x05b77f08, actual 0x05bf7f08)

FAILURE (read/write) @ 0xadbef838: expected 0x05b7df08, actual 0x05bfdf08)

FAILURE (read/write) @ 0xadbff838: expected 0x05b7ff08, actual 0x05bfff08)

FAILURE (read/write) @ 0xafb96838: expected 0x05f72d08, actual 0x05ff2d08)

FAILURE (read/write) @ 0xafb9f838: expected 0x05f73f08, actual 0x05ff3f08)

FAILURE (read/write) @ 0xafbab838: expected 0x05f75708, actual 0x05ff5708)

FAILURE (read/write) @ 0xafbb7838: expected 0x05f76f08, actual 0x05ff6f08)

FAILURE (read/write) @ 0xafbcc838: expected 0x05f79908, actual 0x05ff9908)

FAILURE (read/write) @ 0xafbd5838: expected 0x05f7ab08, actual 0x05ffab08)

FAILURE (read/write) @ 0xafbd8838: expected 0x05f7b108, actual 0x05ffb108)

FAILURE (read/write) @ 0xafbde038: expected 0x05f7bc08, actual 0x05ffbc08)

FAILURE (read/write) @ 0xafbdf038: expected 0x05f7be08, actual 0x05ffbe08)

FAILURE (read/write) @ 0xafbe4838: expected 0x05f7c908, actual 0x05ffc908)

FAILURE (read/write) @ 0xafbea038: expected 0x05f7d408, actual 0x05ffd408)

FAILURE (read/write) @ 0xafbf3838: expected 0x05f7e708, actual 0x05ffe708)

FAILURE (read/write) @ 0xafbf7038: expected 0x05f7ee08, actual 0x05ffee08)

FAILURE (read/write) @ 0xafbff838: expected 0x05f7ff08, actual 0x05ffff08)

FAILURE (read/write) @ 0xb5bcf838: expected 0x06b79f08, actual 0x06bf9f08)

FAILURE (read/write) @ 0xb5bdf838: expected 0x06b7bf08, actual 0x06bfbf08)

FAILURE (read/write) @ 0xb5bfc838: expected 0x06b7f908, actual 0x06bff908)

FAILURE (read/write) @ 0xb7b97038: expected 0x06f72e08, actual 0x06ff2e08)

FAILURE (read/write) @ 0xb7ba4838: expected 0x06f74908, actual 0x06ff4908)

FAILURE (read/write) @ 0xb7bac838: expected 0x06f75908, actual 0x06ff5908)

FAILURE (read/write) @ 0xb7bbe838: expected 0x06f77d08, actual 0x06ff7d08)

FAILURE (read/write) @ 0xb7bbf838: expected 0x06f77f08, actual 0x06ff7f08)

FAILURE (read/write) @ 0xb7bdf838: expected 0x06f7bf08, actual 0x06ffbf08)

FAILURE (read/write) @ 0xb7bf1838: expected 0x06f7e308, actual 0x06ffe308)

FAILURE (read/write) @ 0xb7bf7038: expected 0x06f7ee08, actual 0x06ffee08)

FAILURE (read/write) @ 0xb7bfa838: expected 0x06f7f508, actual 0x06fff508)

FAILURE (read/write) @ 0xb7bff038: expected 0x06f7fe08, actual 0x06fffe08)
Iteration:   1726Iteration:   1727Iteration:   1728Iteration:   1729Iteration:   1730Iteration:   1731Iteration:   1732Iteration:   1733Iteration:   1734Iteration:   1735Iteration:   1736Iteration:   1737Iteration:   1738Iteration:   1739Iteration:   1740Iteration:   1741Iteration:   1742Iteration:   1743Iteration:   1744Iteration:   1745Iteration:   1746Iteration:   1747Iteration:   1748Iteration:   1749Iteration:   1750Iteration:   1751Iteration:   1752Iteration:   1753Iteration:   1754Iteration:   1755Iteration:   1756Iteration:   1757Iteration:   1758Iteration:   1759Iteration:   1760Iteration:   1761Iteration:   1762Iteration:   1763Iteration:   1764Iteration:   1765Iteration:   1766Iteration:   1767Iteration:   1768Iteration:   1769Iteration:   1770Iteration:   1771Iteration:   1772Iteration:   1773Iteration:   1774Iteration:   1775Iteration:   1776Iteration:   1777Iteration:   1778Iteration:   1779Iteration:   1780Iteration:   1781Iteration:   1782Iteration:   1783Iteration:   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Tested 2680 iteration(s) with 78 errors.
Failed to load '/boot/Image'
Failed to load '/boot/k3-am642-evm.dtb'
Bad Linux ARM64 Image magic!
=> 

結果サマリ
テスト回数 全2680回中 1回エラー発生。
詳細:
1725回目で78アドレスでR/Wエラーが発生。

以上

U-Boot SPL 2021.01-00001-g911f54274e-dirty (Mar 17 2022 - 17:36:26 +0900)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
SPL initial stack usage: 13392 bytes
Trying to boot from MMC2
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.5(release):08.00.00.004-dirty
NOTICE:  BL31: Built : 10:51:05, Mar 22 2022

U-Boot SPL 2021.01-00001-g911f54274e-dirty (Aug 01 2022 - 15:40:15 +0900)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
Trying to boot from MMC2


U-Boot 2021.01-00001-g911f54274e-dirty (Aug 01 2022 - 15:40:15 +0900)

SoC:   AM64X SR1.0
Model: Texas Instruments AM642 EVM
DRAM:  1 GiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from SPIFlash... SF: Detected s25fl512s with page size 512 Bytes, erase size 256 KiB, total 64 MiB
*** Warning - bad CRC, using default environment

In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Found i2c device at bus: 0x01 addr: 0x50
testdata[16]: 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
Net:   eth0: ethernet@8000000
Hit any key to stop autoboot:  2  1  0 
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
1583 bytes read in 2 ms (772.5 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Running uenvcmd ...
Testing 80000000 ... bd000000:
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FAILURE (read/write) @ 0x87be6838: expected 0x00f7cd08, actual 0x00ffcd08)
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Tested 3056 iteration(s) with 1 errors.
Failed to load '/boot/Image'
Failed to load '/boot/k3-am642-evm.dtb'
Bad Linux ARM64 Image magic!
=> 

結果サマリ
テスト回数 全3056回中 1回エラー発生。
詳細:
2352回目で1アドレスでR/Wエラーが発生。

以上


Do you have any thoughts what is the root cause of the failure?
If you need more information, from the customer, please let me know.

Thanks and regards,
Koichiro Tashiro

  • Koichiro, will get back to you tomorrow.  Do they have JTAG access to the board?

    Regards,

    James

  • Greetings Koichiro,

    While we may not need it yet, please do confirm if they have JTAG access to the board as it can be a possible debug tool. To start with, can you have them examine their PCB layout on their custom board to see if they routed bit 19 any differently than the other bits? It's possible there could be some cross talk occurring sporadically and bit 20 or 18 could be affecting bit 19. In addition it could be some minor manufacturing issue with that trace, so if possible please have them review the produced trace of bit 19 with the manufacturer to see if there are any minor production issues with tolerances or spacing between the other bit lines. 

    You can find the latest revision of our DDR Board Design and Layout Guidelines below in the technical documentation titled "AM64x/AM243x DDR Board Design and Layout Guidelines"

    https://www.ti.com/product/AM6442#tech-docs 


    Sincerely,

    Lucas