Microzed bug-fix,

[Ian Lepore]

On Tue, 2014-04-29 at 14:22 -0700, Thomas Skibo wrote:
> Hi,
> 
> Another bug-fix.
> 
> Without this, Microzed or any other Zynq board with 1G of memory panics. 
>   It is because of a lack of contiguous virtual space.  I moved the 
> mappings of PSIO devices to increase vm_max_kernel_address.
> 
> I wonder if we'll still have this problem running an ARM board with 2G 
> memory.

There's a newer way to do this, but I didn't do the xilinx stuff when I
set this up last year because I had no way to test it.  The new scheme
lets you declare the physaddr and size of any regions to be
device-mapped, and it dynamically allocates virtual address space for it
from the top down, so device mapping doesn't waste any space.

Please try the attached patch.  The *_VBASE defines are deleted because
those things aren't at a fixed address anymore.  If it's ever necessary
to get a virtual address outside of the bus_space system (like for a
debugging uart) you can call arm_devmap_ptov().

Oh -- I have 2G wandboards that have no trouble with memory.

-- Ian

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