[Bug 1030594] Re: enable flat device tree support

[dann frazier]

I'd also recommend this fix, which makes -dtb consistent with other parameters (that is, can use relative paths):
  https://bugs.launchpad.net/qemu-linaro/+bug/1004205

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https://bugs.launchpad.net/bugs/1030594

Title:
  enable flat device tree support

Status in “qemu-linaro” package in Ubuntu:
  New
Status in “qemu-linaro” source package in Precise:
  New
Status in “qemu-linaro” source package in Quantal:
  New

Bug description:
  Please add a build-dep on libfdt-dev, which will add flat device tree
  support to qemu. This will let users pass the '-dtb' command line
  option, allowing us to specify a device tree file. Though it is
  supposedly possible to pass a dtb file to the instance by appending it
  to the zImage, I've been unable to get this to work (even with
  CONFIG_ARM_APPENDED_DTB=y). The -dtb method is more straightforward
  and I've been able to boot a highbank target with it (and the patch
  referenced in #1030588):

  ubuntu at server-1343577662-az-3-region-a-geo-1:~$ sudo qemu-system-arm -nographic -M highbank -m 4089 -kernel ~/vmlinuz-3.2.0-2000-highbank -append console=ttyAMA0 -dtb ~/highbank.dtb 
  l2x0_priv_write: Bad offset 900
  l2x0_priv_write: Bad offset 904
  Booting Linux on physical CPU 0
  Linux version 3.2.0-2000-highbank (buildd at nikusui) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu3) ) #1-Ubuntu SMP PREEMPT Tue Mar 27 01:49:53 UTC 2012 (Ubuntu 3.2.0-2000.1-highbank 3.2.12)
  CPU: ARMv7 Processor [410fc090] revision 0 (ARMv7), cr=10c5387d
  [...]

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