How to allocate memory and get the physical address in kernel

[Arun KS]

Hi Silverstri,


On Thu, Feb 6, 2014 at 7:56 AM, m silverstri <michael.j.silverstri at gmail.com
> wrote:

> Hi,
>
> I am developing a kernel driver. I need to allocate buffer in the
> kernel driver and pass the physical address of the buffer to the Chip
> register so that it can generate output there.
>
> I tried using kmalloc() but I don' get any output from the chip.
>
If your device is not having an iommu, you need to convert the address
returned by kmalloc using __pa(addr) before you program the chip.

Thanks,
Arun

>
> Is there a better way to achieve what I want?
>
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