节点无法启动、并显示BIOS MRC已映射出DIMM

• 节点关闭、无法启动、并显示以下事件：

Running full memory initialization.
DIMM: XX mapped out. BIOS MRC mapped out DIMM. Major Code 0xED Minor Code 0x09
ERROR: [55] Memory not installed
ERROR: DXE IPL not found

• BIOS 升级失败，系统正在使用 BIOS 备份映像启动，除了“BIOS MRC mapped out DIMM “
  （例如：升级前BIOS版本为18.7，升级后应该是18.13，但启动时却是18.5。）

================ Log #1 
Files /cfcard/x86_64/freebsd/image1/VERSION and /var/VERSION differ
ERROR: /var cannot be downgraded.
Waiting for PIDS:  2057.
Terminated
.
Setting default boot image to image1... 
done.
Uptime: 617d1h21m12s
================ Log #1 end time 
================ Log #2 start time 
BIOS Version: 18.7
Portions Copyright (C) 2014-2022 NetApp, Inc. All Rights Reserved.
Initializing System Memory ...
DIMM:7 mapped out. BIOS MRC mapped out DIMM. Major / Minor Error Code: 0x30 / 0x2D
Complete channel mapped out.
System Reset Requested.
BIOS Version: 18.7
Portions Copyright (C) 2014-2022 NetApp, Inc. All Rights Reserved.
Initializing System Memory ...
DIMM:12 mapped out. BIOS MRC mapped out DIMM. Major / Minor Error Code: 0x31 / 0x36
Complete channel mapped out.
System Reset Requested.
BIOS Version: 18.7
Portions Copyright (C) 2014-2022 NetApp, Inc. All Rights Reserved.
Initializing System Memory ...
HALT! Fatal Error: All memory mapped out.
Error Action: HALT System.
BIOS Version: 18.5
Portions Copyright (C) 2014-2022 NetApp, Inc. All Rights Reserved.
Initializing System Memory ...
MEMORY WARNING: Major Code 0x30 Minor Code 0x2D Dimm 7
MEMORY WARNING: Major Code 0x30 Minor Code 0x2D Dimm 7
MEMORY WARNING: Major Code 0x30 Minor Code 0x2E Dimm 7
HALT! Memory Initialize Fatal Error.
Error Action: HALT System.
BIOS Version: 18.5
Portions Copyright (C) 2014-2022 NetApp, Inc. All Rights Reserved.
Initializing System Memory ...
～
*****************************************
*** Booted from Backup Firmware Image ***
*****************************************
ACPI RSDP Found at 0x6f7fe014
Abort AUTOBOOT
LOADER-B>

• 如果在ONTAP升级期间遇到此问题描述、则ANDU可能会暂停、因为节点无法启动。