Re: request_mem_region

[Daniel Redway <daniel.redway85@xxxxxxxxx>]

Ok I understood.
after I call request_mem_region , can real device write some byte to this region? 
or dont touch? I read mem region of device configuration space, start and length register

thanks

2011/6/21 Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>

On 20/06/2011, Daniel Redway <daniel.redway85@xxxxxxxxx> wrote:
> Hello
>
> As I understand ioremap() maps and returns virtual address
> for a given physical(bus) address associated with my PCI card.
> That is cool and clear.
>
>
> What is the purpose of request_mem_region()?

checking http://lxr.linux.no/linux+v2.6.39/kernel/resource.c#L732, I
think that function generally says "alright,I wanna reserve this
memory region, so no one may touch it....until I mark it as free
again"

--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

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