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CONFIG_DATA_SHIFT: Data shift

General informations

The Linux kernel configuration item CONFIG_DATA_SHIFT:

Help text

On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. Smaller is the alignment, greater is the number of necessary DBATs.

On 8xx, large pages (512kb or 8M) are used to map kernel linear memory. Aligning to 8M reduces TLB misses as only 8M pages are used in that case.

Hardware

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