On 11/28/06, Jon Ringle <[email protected]> wrote:
Robert Hancock wrote:
> Jon Ringle wrote:
>> Hi,
>>
>> I need to reserve a page of memory at a specific area of RAM that will
>> be used as a "shared memory" with another processor over PCI. How can I
>> ensure that the this area of RAM gets reseved so that the Linux's memory
>> management (kmalloc() and friends) don't use it?
>>
>> Some things that I've considered are iotable_init() and ioremap().
>> However, I've seen these used for memory mapped IO devices which are
>> outside of the RAM memory. Can I use them for reseving RAM too?
>>
>> I appreciate any advice in this regard.
>
> Sounds to me like dma_alloc_coherent is what you want..
>
It looks promising, however, I need to reserve a physical address area
that is well known (so that the code running on the other processor
knows where in PCI memory to write to). It appears that
dma_alloc_coherent returns the address that it allocated. Instead I need
something where I can tell it what physical address and range I want to use.
I've seen other projects just boot a 128M board with mem=120M and just
use the 8MB at 120 to talk to the other processor..
Dave.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
