Re: mount PCI-express RAM memory as block device

[Shakthi Kannan]

Hi,

--- "Arnd Bergmann" <arnd@xxxxxxxx> wrote:
> You could use the MTD block driver with on the phram

> device by simply specifying the address/size of the 
> memory as a module parameter.  If you need 
> autodetection, the easiest way to do that would be 
> including the phram MTD driver in your pci device 
> driver.

I studied the slram.c and rd.c device drivers. The
ramdisk driver that I had written earlier, similar to
the above, had worked fine. With respect to PCI
express, I had to modify just the memory tranfer
function. The memcpy functions translate to byte
access. But, PCI express is dword access. So, I wrote
my own memory copy to do long read/write using
readl(), writel(). The block device driver works fine.

Thanks,

K Shakthi

=====
-----------------------------------------------------
K Shakthi
Specsoft (Hexaware Technologies), ASIC Design Center
http://www.geocities.com/shakthimaan
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