I get this when it boots up? What does this mean?

here's part of the var log messages file:

Nov 30 13:07:19 eng-rhel5-64 kernel: Linux version 2.6.18-53.el5 ([EMAIL PROTECTED]) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Wed Oct 10 16:34:19 EDT 2007 Nov 30 13:07:19 eng-rhel5-64 kernel: Command line: ro root=LABEL=/1 rhgb quiet
Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-provided physical RAM map:
Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 0000000000000000 - 000000000009ec00 (usable) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 0000000000100000 - 000000007fe01c00 (usable) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 000000007fe01c00 - 000000007fe53c00 (ACPI NVS) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 000000007fe53c00 - 000000007fe55c00 (ACPI data) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 000000007fe55c00 - 0000000080000000 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved) Nov 30 13:07:19 eng-rhel5-64 kernel: BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
Nov 30 13:07:19 eng-rhel5-64 kernel: DMI 2.5 present.
Nov 30 13:07:19 eng-rhel5-64 kernel:   >>> ERROR: Invalid checksum
Nov 30 13:07:19 eng-rhel5-64 kernel: No NUMA configuration found
Nov 30 13:07:19 eng-rhel5-64 kernel: Faking a node at 0000000000000000-000000007fe01000 Nov 30 13:07:19 eng-rhel5-64 kernel: Bootmem setup node 0 0000000000000000-000000007fe01000 Nov 30 13:07:19 eng-rhel5-64 kernel: Memory for crash kernel (0x0 to 0x0) notwithin permissible range

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