platform: add DMA support for the EZ-Flash Parallel

[lifehackerhansol]

No description provided.

[Gericom]

Are there any drawbacks? You mentioned that the performance will be lower when dma is used (in the current way it works) because there are no sequential reads. Are there any games that work poorer because of that?

[lifehackerhansol]

Depends on the game, games that have FMVs will run sluggish (for example Castlevania DoS, but I don't even know if this game works without DMA to begin with). Can't think of any others off the top of my head.

It's a trade between fixing games that basically don't work without DMA vs slowing everything down I suppose.

This patch does work otherwise, but if we want to hold off until making a decision on multi-block DMA we can do that.

[Gericom]

Depends on the game, games that have FMVs will run sluggish (for example Castlevania DoS, but I don't even know if this game works without DMA to begin with). Can't think of any others off the top of my head.

It's a trade between fixing games that basically don't work without DMA vs slowing everything down I suppose.

This patch does work otherwise, but if we want to hold off until making a decision on multi-block DMA we can do that.

I think it would be good to do some more testing. Comparing with and without dma for performance sensitive games and see if enabling DMA is worth it.