From mboxrd@z Thu Jan 1 00:00:00 1970 In-Reply-To: Date: Fri, 15 Jan 1999 14:02:45 +0100 To: linuxppc-dev@lists.linuxppc.org, Ty Hedrick From: Benjamin Herrenschmidt Subject: Re: Powerbase IDE: DMA & ohare-ata Message-Id: <19990115140245.026852@mail.mipsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Fri, Jan 15, 1999, Ty Hedrick wrote: >After looking at DMA I decided to enable the ohare register mentioned >earlier, stuffing the new value in also resulted in a working system, and >approximately doubled the IDE transfer rate as measured by hdparm - to a >whopping 3.7 MB/s. > >Is there any way to be kind to all the Powerbase owners out there and >enable DMA by default without breaking any other systems? Also, the mod >to ohare and heathrow does seem to help lots of platforms. The test kernel I have on my web site will soon have code for both ohare and heathrow. I've added an option do disable the speed boost in case of troubles (a command line option, currently implemented as a "hack" because I didn't want to touch non-arch files). I'll add the fix for not-checking the DMA interrupts, they are not used anyway. I'll release this version with diffs as soon as I have finished some other little things in progress, probably during the week-end. If the speed-boost proves to be harmless to everyone, I'll leave it in and probably submit it 'as-is'. If it doesn't, I'll either change the command-line arg to optionally enable it instead of optionally disable it, or add some drive-specific parameters or some kind of "exception list". -- E-Mail: BenH. Web : [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. To unsubscribe from linuxppc-dev, send ]] [[ the message 'unsubscribe' to linuxppc-dev-request@lists.linuxppc.org ]]