Re: How to Switch DMA off for only one Harddisk at Kernelboot

Oliver Joa
2007-12-16T19:53:36Z

Hi,

Gabriel C wrote:

[...]

>>> 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.
>
> grep nodma Documentation/ide.txt
> "hdx=nodma" : disallow DMA
>
> ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD.

/usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt
"ide=nodma" : disable DMA globally for the IDE subsystem.

/usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt
"ide=nodma" : disable DMA globally for the IDE subsystem.

/usr/src/linux-2.6.12# grep nodma Documentation/ide.txt
"ide=nodma" : disable DMA globally for the IDE subsystem.

Sorry, but I can not find this option, and it does not work. Which
kernel do you use?

Thanks

Olli