Messages in this thread | | | Date | Sun, 16 Dec 2007 20:33:13 +0100 | From | Oliver Joa <> | Subject | Re: How to Switch DMA off for only one Harddisk at Kernelboot |
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Hi,
Gabriel C wrote: > Oliver Joa wrote: >> Hi, > > Hi Oliver , > >> how can I tell the kernel not to probe DMA for a specific harddisk (e.g. >> hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. >> The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, >> the kernel boots about 2 minutes faster, but then I can not switch on >> DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to >> live with this 2 minutes waiting time or is there another solution? I >> did not find any kernel-parameter for this purpose. >> >> Sorry if I ask here, but I can not find any solution, and I asked >> already in other groups. >> >> Thank you very much > > Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 )
I tried this already, it does not work.
> Also have a look at Documentation/ide.txt.
I read this already. Searching for "nodma" in this document gives only one line:
"ide=nodma" : disable DMA globally for the IDE subsystem.
If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment.
Thanks
Olli
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