Hello,
Am Donnerstag, 23 Juni 2016, 17:54:49 schrieb Geoff Levand:
> +linux,usable-memory
> +-------------------
> +
> +This property is set on PowerPC and arm64 by kexec-tools during kdump
> +to tell the crash kernel the base address of its reserved area of memory,
> and +the size. e.g.
> +
> +/ {
> + chosen {
> + linux,usable-memory = <0x9 0xf0000000 0x0 0x10000000>;
> + };
> +};
On powerpc, linux,usable-memory isn't in /chosen. It is put by kexec-tools
in each /memory node and has the same format as the reg property. During
early boot, the kernel goes through the /memory nodes to find usable memory
and for each node, if there's a linux,usable-memory property it will use it
instead of the reg property to find the ranges of memory it can use (see
early_init_dt_scan_memory in drivers/of/fdt.c).
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center
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