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CONFIG_MMC_BLOCK_BOUNCE: Use bounce buffer for simple hosts

General informations

The Linux kernel configuration item CONFIG_MMC_BLOCK_BOUNCE:

Help text

SD/MMC is a high latency protocol where it is crucial to send large requests in order to get high performance. Many controllers, however, are restricted to continuous memory (i.e. they can't do scatter-gather), something the kernel rarely can provide.

Say Y here to help these restricted hosts by bouncing requests back and forth from a large buffer. You will get a big performance gain at the cost of up to 64 KiB of physical memory.

If unsure, say Y here.

Hardware

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