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Disable DMA channels in ttyS0 and ttyS3

Hi all,

I'm trying to use External DMA Channels, ext_dma0 and ext_dma1.
And that use internal DMA channels 4, 5, 6 and 7.
So, it is needed to disable internal DMA channels in serial drivers,
when I want to use ttyS0 and ttyS3.

But disabling multiplexed internal DMA channels in serial drivers is not simple,
just changing "info->uses_dma = 0;" in startup() function is not working.

What's the problem?

Hyojun Kim