creating bigger RAM DISK

Am trying to create a RAMDISK of 1 GB in a 2 GB RAM.

But it is only possible to create 512 MB RAMDISK.

While searching i found that it is possible to create 25% of RAM as RAMDISK.
We want to increase a kernel parameter to create a bigger RAMDISK

Will you please help me what to do ?

Which kernel configuration i need to change for this ??

and how could i change this ?

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