Allocating more than 4 MB of pinned contiguous memory in the Linux Kernel

Question

For some interaction with a PCI device that is being built, we\'d like to create large contiguous pieces of memory that the board can access. As it stands now, the largest piece

Answer 1

If you can compile your PCI device driver into the kernel (that is, not linked as a module), you could try allocating the memory at boot time. That should let you bypass the upper bounds on dynamic allocations. Refer to Linux Device Drivers, ed. 3 ch. 8 for details.

Answer 2

CMA(Contiguous Memory Allocator) are the best solution for your need IMO. You just need to ship to the newest kernel.