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SubjectRe: CONFIG_SOUND_DMAP: Confusing Configure.help entry.
I'm assuming you have more than 16 MB of RAM, in which case it's safe to
say Y here if you have an ISA soundcard.

The final line should probably be clarified to read: "Say Y if you have
16MB or more RAM and an ISA soundcard but N if you have a PCI sound
card."

---
Dan Chen crimsun@email.unc.edu
GPG key: www.cs.unc.edu/~chenda/pubkey.gpg.asc

On Sun, 16 Dec 2001, Niels Kristian Bech Jensen wrote:

> The Configure.help entry for CONFIG_SOUND_DMAP (included below) leaves
> me a bit confused. It says there can be a problem on machines with more
> than 16MB of RAM. At the same time it says that CONFIG_SOUND_DMAP
> should be enabled unless you have more the 16MB of RAM (or a PCI sound
> card). Is it my language skill (English is not my mother tongue) or is
> it a contradiction? When should CONFIG_SOUND_DMAP be enabled?
>
>
> Persistent DMA buffers
> CONFIG_SOUND_DMAP
> 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.o module.
>
> Say Y unless you have 16MB or more RAM or a PCI sound card.
>
>

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