Accessing Ram on PCI card

Accessing Ram on PCI card

[Robert Clove]

Hi,

I have a pci card that has some amount of ram and flash memory on it.
I have found the bar address range for the memory.
I want to transfer a file to that memory and read from that memory.

Any pointers(in terms of sample code) how can i do that?


Regards
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Accessing Ram on PCI card

[Greg KH]

On Mon, Jun 01, 2015 at 10:55:44PM +0530, Robert Clove wrote:
> Hi,
> 
> I have a pci card that has some amount of ram and flash memory on it.

What kind of card?

> I have found the bar address range for the memory.
> I want to transfer a file to that memory and read from that memory.

PCI card memory are not usually set up as a filesystem, how can you copy
a file to it?

> Any pointers(in terms of sample code) how can i do that?

Why do you want to do this?  What exactly are you trying to solve here?

greg k-h

Accessing Ram on PCI card

[Robert Clove]

Hi I have a PCI based card which have few RAM on it.
I have to copy the text file to RAM and read it too.

Actually i want my pci device to be exposed as block device and then mount
file system on it.

On Tue, Jun 2, 2015 at 6:59 AM, Greg KH <gregkh@linuxfoundation.org> wrote:

> On Mon, Jun 01, 2015 at 10:55:44PM +0530, Robert Clove wrote:
> > Hi,
> >
> > I have a pci card that has some amount of ram and flash memory on it.
>
> What kind of card?
>
> > I have found the bar address range for the memory.
> > I want to transfer a file to that memory and read from that memory.
>
> PCI card memory are not usually set up as a filesystem, how can you copy
> a file to it?
>
> > Any pointers(in terms of sample code) how can i do that?
>
> Why do you want to do this?  What exactly are you trying to solve here?
>
> greg k-h
>
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Accessing Ram on PCI card

[Greg KH]

On Wed, Jun 03, 2015 at 08:27:20PM +0530, Robert Clove wrote:
> Hi I have a PCI based card which have few RAM on it.

You said that before :)

You didn't answer the question of "what kind of PCI card is this?"

> I have to copy the text file to RAM and read it too.

Who is telling you you "have to"?

> Actually i want my pci device to be exposed as block device and then mount file
> system on it.

Then use it as a block device.  Note, you need a special type of PCI
card to be able to do this, as well as a special kernel driver for that
PCI card to make it work properly.

But without any knowledge of what type of PCI card you have, it's a bit
hard to give you anymore help, sorry.

greg k-h

Accessing Ram on PCI card

[Robert Clove]

Actually it is a PCI based NIC card having a NIC port and some RAM on it.

On Thu, Jun 4, 2015 at 11:40 AM, Greg KH <gregkh@linuxfoundation.org> wrote:

> On Wed, Jun 03, 2015 at 08:27:20PM +0530, Robert Clove wrote:
> > Hi I have a PCI based card which have few RAM on it.
>
> You said that before :)
>
> You didn't answer the question of "what kind of PCI card is this?"
>
> > I have to copy the text file to RAM and read it too.
>
> Who is telling you you "have to"?
>
> > Actually i want my pci device to be exposed as block device and then
> mount file
> > system on it.
>
> Then use it as a block device.  Note, you need a special type of PCI
> card to be able to do this, as well as a special kernel driver for that
> PCI card to make it work properly.
>
> But without any knowledge of what type of PCI card you have, it's a bit
> hard to give you anymore help, sorry.
>
> greg k-h
>
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Accessing Ram on PCI card

[Greg KH]

On Thu, Jun 04, 2015 at 12:44:34PM +0530, Robert Clove wrote:
> Actually it is a PCI based NIC card having a NIC port and some RAM on it.

A NIC card is not designed to hold a filesystem.  If you wish to change
this, you are going to have to write a kernel driver that talks to that
card and exposes a block interface to userspace.

Best of luck!

greg k-h

Accessing Ram on PCI card

[Robert Clove]

That is what i have to do.

On Thu, Jun 4, 2015 at 1:36 PM, Greg KH <gregkh@linuxfoundation.org> wrote:

> On Thu, Jun 04, 2015 at 12:44:34PM +0530, Robert Clove wrote:
> > Actually it is a PCI based NIC card having a NIC port and some RAM on it.
>
> A NIC card is not designed to hold a filesystem.  If you wish to change
> this, you are going to have to write a kernel driver that talks to that
> card and exposes a block interface to userspace.
>
> Best of luck!
>
> greg k-h
>
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