Messages in this thread | | | From | "Cho, joon-woo" <> | Subject | Re: [Q] How can I transfer data from hard disk to PCI device'smemory | Date | Fri, 8 Aug 2003 11:53:43 +0900 |
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Not to PCI device's register, but to PCI device's SDRAM memory.
In detail after I modify kernel, I want to transfer data
from HDD controller's data register (IDE controller case)
to another PCI's SDRAM memory with the help of kernel
( I think Direct I/O(using O_DIRECT flag) )
Is this impossible?
----- Original Message ----- From: "wa moua" <wmatlus@yahoo.com> To: "Cho, joon-woo" <jwc@core.kaist.ac.kr> Sent: Friday, August 08, 2003 1:19 AM Subject: Re: [Q] How can I transfer data from hard disk to PCI device'smemory
> Are you trying to transfer data from one PCI register > to another PCI register? Could you please rephrase > your problem. PCI is a bus not a system storage. > > --- "Cho, joon-woo" <jwc@core.kaist.ac.kr> wrote: > > Thank you for your reply, and I am very pleasant to > > talk with you. ^^ > > > > But english is not mother tongue, so I am little > > confused about your > > sentence. > > > > > The O_DIRECT I/O handling > > > needs to know about stuff like page reference > > counts that PCI space > > > doesn't have lots of older (and some current) > > hardware has real problems > > > with PCI PCI transfers. > > > > At above sentence, you mean that > > > > 'To handle O_DIRECT I/O, stuff like page reference > > is needed. > > > > But some HW(expecially old HW) doesn't have PCI > > space, > > > > so that it needs much additional work to add a > > PCI-PCI transferring.' > > > > Do I understand right? > > > > > > Please reply, thanks. > > > > > > > > > So its a non trivial project, although doable
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