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由 Simon Glass 提交于
The U-Boot sound system provides basic support for beeping. At present it does not use driver model, but it needs to be converted. Add an option to enable driver model for sound. For now it is not connected to anything. Future work will add drivers which use this option. It will then be removed once everything is converted. Signed-off-by: NSimon Glass <sjg@chromium.org>
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