DMA on ht6560b?
Hi, With digging into the code... I think the ht6560b controller supports DMA. At least it did so in 2.2 (where hdparm could still turn it on). DMA in 2.2 would improve the HD from about 1M/s to 4M/s. So that's quite interesting. Also the datasheet claims that there is full ANSI ATA-4a support. According to the ATA table on wikipedia that should include up to mwdma 2 and udma33. What's the magic that will turn it on for the ht6560b controller? I would guess at the [sm]wdma_mask fields in hwif_t? Plus something for set_dma_mode? Some help would be appreciated. Thanks, Jan Evert - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: DMA on ht6560b?
I think the ht6560b controller supports DMA. The data sheet doesn't. It's a PIO controller capable of PIO4 with 32bit host to cpu transfers are best. - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: DMA on ht6560b?
Alan Cox wrote: I think the ht6560b controller supports DMA. The data sheet doesn't. It's a PIO controller capable of PIO4 with 32bit host to cpu transfers are best. Hmm. But what do you then think that 2.2 did? I mean it now does 1.15M/s and in 2.2 it would do ~4M/s with DMA on. Were those perhaps ISA style DMA transfers (as opposed to BM-DMA)? I really should compile a 2.2 with ht6560b support... Thanks for answering, though, I don't know that much about ATA. Jan Evert - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: DMA on ht6560b?
Hmm. But what do you then think that 2.2 did? PIO4 I mean it now does 1.15M/s and in 2.2 it would do ~4M/s with DMA on. It's never done DMA. - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
