CONFIG_SOUND_DMAP: Persistent DMA buffers

General informations

The Linux kernel configuration item CONFIG_SOUND_DMAP:

• prompt: Persistent DMA buffers
• type: bool
• depends on: (none)
• defined in sound/oss/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.39, 3.0–3.19, 4.0–4.14

Help text

Linux can often have problems allocating DMA buffers for ISA sound cards on machines with more than 16MB of RAM. This is because ISA DMA buffers must exist below the 16MB boundary and it is quite possible that a large enough free block in this region cannot be found after the machine has been running for a while. If you say Y here the DMA buffers (64Kb) will be allocated at boot time and kept until the shutdown. This option is only useful if you said Y to "OSS sound modules", above. If you said M to "OSS sound modules" then you can get the persistent DMA buffer functionality by passing the command-line argument "dmabuf=1" to the sound module.

Say Y unless you have 16MB or more RAM or a PCI sound card.

Hardware

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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