What is the size of the kernel virtual map?

  I have a device with two 2^28 sized BARs. (Optionally, this will be
in 64-bit address space later on). 

    Base address register at 0x18
      type: 32-bit noncacheable memory
      base: 0xe0000000, size: 0x10000000
    Base address register at 0x1c
      type: 32-bit noncacheable memory
      base: 0xd0000000, size: 0x10000000

pweleven0: pci_mapreg_map failed for bar 18 (pw1100_snoop1)
pweleven0: pci_mapreg_map failed for bar 1c (pw1100_snoop2)

  I expect that I need to make the kernel virtual map larger.
  We can map a 2^26 sized region okay.

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