Messages in this thread | | | Subject | How to tell kernel that a region of memory is reserved (in middle of ram)? | From | Maxim Levitsky <> | Date | Wed, 02 Jun 2010 13:11:22 +0300 |
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Hi,
I need to reserve a region of ram to store there a ramoops buffer. I need to do so early so kernel doesn't overwrite the existing contents.
How to do it?
I noticed that doing memmap=20M$0x70000000 crashes the system although it promised to work. Is that a bug?
I have 2GB system with following memory map:
[ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) [ 0.000000] BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) [ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) [ 0.000000] BIOS-e820: 0000000000100000 - 000000007fcfd000 (usable) [ 0.000000] BIOS-e820: 000000007fcfd000 - 000000007fd08000 (reserved) [ 0.000000] BIOS-e820: 000000007fd08000 - 000000007fd52000 (usable) [ 0.000000] BIOS-e820: 000000007fd52000 - 000000007fd55000 (reserved) [ 0.000000] BIOS-e820: 000000007fd55000 - 000000007fdbb000 (usable) [ 0.000000] BIOS-e820: 000000007fdbb000 - 000000007fdbf000 (reserved) [ 0.000000] BIOS-e820: 000000007fdbf000 - 000000007fe70000 (usable) [ 0.000000] BIOS-e820: 000000007fe70000 - 000000007febf000 (ACPI NVS) [ 0.000000] BIOS-e820: 000000007febf000 - 000000007ff00000 (ACPI data) [ 0.000000] BIOS-e820: 000000007ff00000 - 0000000080000000 (reserved) [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) [ 0.000000] BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved) [ 0.000000] BIOS-e820: 00000000fed1c000 - 00000000fed20000 (reserved) [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) [ 0.000000] BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
Best regards, Maxim Levitsky
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