There're several problems in hb kernel.
1) CONFIG_DEBUG_HIGHBANK_UART is not enabled
2) HB_DEBUG_LL_VIRT_BASE resides in vmalloc area, wasting memory
3) arch/arm/mach-highbank/include/mach/debug-macro.S uses the predefined 
phys/virt uart io address directly - should calculate the value from 
HB_DEBUG_LL_VIRT_BASE instead.

1) is critical, which ensures 0xfee36000 is mapped to 0xfff36000 so that
printch works for earlyprintk.

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https://bugs.launchpad.net/bugs/1034781

Title:
  kernel hangs with earlyprintk on highbank

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