Re: how to allocate 9MB of memory in kernel ?

Misbah khan ha scritto:

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You can use the mem option to tell to the kernel that you've got less 
ram you really have. 

I really didnt got the point you made. Can you please elaborate it for my
understanding.

If you've got 128MB of ram you can use the mem option to tell to the 
kernel the it can use only (128 - 9) MB of ram, after that you can use 
that chunk of ram, however I think it's not the case if your goal is to 
use a sdram as you said in the previous message.

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However you can read Linux device drivers chapter 8 

i dont need to allocate large memory at the boot time also vmalloc and
kmalloc i cant use as it can allocate free page up to 128kb, hence if you
could suggest me a better technique i would really appriciate .

The problem about 128KB is only for kmalloc. If I understood correctly 
you need only to remap the 9MB of your sdram.

---Misbah <><


Marco Stornelli wrote:

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Misbah khan ha scritto:

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Hi all,

I need to allocate 9 MB of memory in to the kernel space which i need to
mmap for the application to access.

I need to know what could be the best possible way of doing the same.

Please share your experience in this regard .

Thank you in advance 

----Misbah <><

You can use the mem option to tell to the kernel that you've got less 
ram you really have. However you can read Linux device drivers chapter 8 
"Obtaining Large Buffers" :).

Regards,

-- 
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@coritel.it
+39 06 72582838
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-- 
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@coritel.it
+39 06 72582838