ide disk driver

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Hello,

I am using 2.6.18-rc4-mm1 to implement ata support for my platform's
ata interface based on ata_generic.c

ata_add_device() calls port_start() (i.e. ata_port_start()) which
allocates dma memory. My platform has no DMA and must run in PIO mode.
Is it safe to skip this call with a dummy function?

Also in struct ata_port_info, there are pio_mask, host_flags,
mwdma_mask, udma_mask fields. Which values should I assign on which
fields to ensure PIO-only operation?

Many thanks,
Bahadir

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