how to reserve memory in linux?

[a sudheer]

Hello Ming Lu

On 10/20/06, Ming Liu <eemingliu at hotmail.com> wrote:
>
> Dear all,
> My situation is, I want to reserve some amount of memory and make it
> shared
> by both Linux kernel and another hardware peripheral. That is, when I boot
> linux and execute some user space programs, this part of memory should be
> reserved for other use and cannot be used by both the kernel and those
> applications.


Considering your setup as normal desktop, I hope this can be done by giving
"mem= xxm"  as the boot arguments.  Say the dmesg in your system shows   "
495MB LOWMEM available."  .  In the boot arguments you can give mem=490m
saying the linux to use only 490MB . The rest 5MB can be used later as you
wish.

Please correct if i am wrong.

Thanks
Sudheer



But it could be accessed by Linux with some certain kind of
> application and also be accessed by another hardware peripheral with DMA
> or
> something like that.
>
> I am not sure if I am right but I think it's just like the situation of
> multiprocessing (if we can treat that hardware peripheral as another
> processor, or just use another processor to realize its functions.) and
> that part of memory is just like the hardware shared memory by
> multiprocessor. Am I right?
>
> Then my question is, how to reserve such part of memory in Linux? Does
> Linux has such a function?
>
> I am not falimiar with such a topic, so any hint related to this is
> appreciated.
>
> Thanks for your ideals and suggestions.
>
> Regards
> Ming
>
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