ERST: Can not request iomem region with an unknown e820 entry type
Issue
- System is unable to initialize ERST support due to requested memory range being in an unknown e820 range type, like example below reported on kernel log:
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009e400 (usable)
BIOS-e820: 000000000009e400 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000d7e60000 (usable)
BIOS-e820: 00000000d7e6e000 - 00000000d7e70000 type 9 <------
BIOS-e820: 00000000d7e70000 - 00000000d7e94000 (ACPI data)
BIOS-e820: 00000000d7e94000 - 00000000d7ec0000 (ACPI NVS)
BIOS-e820: 00000000d7ec0000 - 00000000d7ee0000 (reserved)
BIOS-e820: 00000000d7eed000 - 00000000d8000000 (reserved)
BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000001028000000 (usable)
...
ERST: Can not request iomem region <0x d7e6e000-0xd7e70000> for ERST
Environment
- Red Hat Enterprise Linux
- Supermicro H8QG6 (reported with BIOS 3.5)
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