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Linux boot failure after logical partition (LPAR) is booted with AIX or with the Diagnostics CD (DiagCD)

Flashes (Alerts)


Abstract

When you boot the LPAR with AIX or with the DiagCD, the value of the non-volatile random access memory (NVRAM) real-base variable gets set to a new value of 0x2800000. This new value, which is higher in memory than the default value of 0xc00000, results in boot issues.

Content

​Linux Releases Affected
Red Hat Enterprise Linux (RHEL) 9.x
IBM Systems Affected
IBM POWER9 and Power10 systems
Symptoms
When you boot the LPAR with AIX or with the DiagCD, you can see the following error message:
kern/file.c:225: Closing `(ieee1275/cdrom)/ppc/ppc64/initrd.img' failed with 3.
kern/file.c:148: Opening `(ieee1275/cdrom)/ppc/ppc64/initrd.img' succeeded.
error: ../../grub-core/kern/mm.c:552:out of memory.
Workaround

After you boot an LPAR with the DiagCD, you can change the real-base value to the default value of 0xc00000 to resolve this issue. The real-base value can be changed to the default value from the Open Firmware (OF) command prompt by using one of the following methods:

  • OF prompt commands by pressing 8 during the boot operation.
    • To print the real-base value, enter the following command: 
      printenv real-base
    • To set the default value for real-base, enter the following command: 
      setenv real-base c00000
  • Restricted OF prompt commands by pressing 9 during the boot operation.
    • To display the real-base value, enter the following command: 
      DISPLAY_NVRAM_VARS real-base
    • To set the default value for real-base, enter the following command: 
      SET_NVRAM_REALBASE c00000
Fix Outlook 
There is currently no fix outlook that is available for this issue.

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Document Information

Modified date:
16 May 2024

UID

ibm17150526

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