More than 512MB of memory

[Rojhalat Ibrahim <ibrahim@xxxxxxxxxxxxxx>]

Hi,

is there anything special I have to do
when I want to use more than 512MB of memory?
My Yosemite board works fine with 512MB
but when I try 1GB it crashes in 32bit mode
with highmem and also in 64bit mode.
The boot monitor (PMON) maps the 1024MB
to physical addresses 0x0000.0000 - 0x4000.0000.

Thanks
Rojhalat Ibrahim