The Continuous Memory Allocation is larger 128kB for DMA process?

Hi,
I want to allocate the continuous memory larger 128k for DMA process.
But i can't used kmalloc() function for allocate the memory larger 128KB.
Please, hepl me allocate the continuous memory larger 128k for DMA process.

Thanks,

What compiler and operating system are you using? How much memory do you have in total? How much is free before you try to malloc() this amount?

What is kmalloc() ? I'm only familiar with malloc() and calloc().

@ adak,kmalloc

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If your code is to be completely portable, it cannot count on being able to allocate anything larger than 128 KB. If you need more than a few kilobytes, however, there are better ways than kmalloc to obtain memory, which we describe later in this chapter.

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You might want to read up :D
From here.

Thanks, Bayint! I'm a total noob with Linux.

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Originally Posted by Bayint Naung

You might want to read up :D
From here.

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Thanks, but I known kmalloc() function only allocate maximum is 128kB, so i want to know the solution for allocating the continuous memory larger 128k for DMA process.
Please, hepl me!

http://www.makelinux.net/ldd3/chp-15...hp-15-sect-4.2

http://www.makelinux.net/ldd3/

gg

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Originally Posted by Codeplug

15.4. Direct Memory Access

Linux Device Drivers, 3rd Edition

gg

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Thanks for sharing, really!