- we increase the DFU size from 4k to 16k size. This is mainly due to the

  SAM7S128 and SAM7S256 being restricted to 16k lock region size.  If we want
  to lock the bootloader, it has to be 16k aligned.  This wastes a lot of
  memory, since a non-debug DFU implementation fits currently into less than
  4k. But anyway, we have lots of flexibility for the future given that amount
  of space.
- The DFU size change introduces also a change in dfu_api location to 0x103fd0
- Allow GETSTATE and GETSTATUS from runtime mode (optional in DFU spec)
- Make dfu_status a .data.shared variable, since it is used from GETSTATUS
  which we already support in runtime mode
- do some led switching while flashing via DFU
- disable all non-usb/dbgu interrupts when switching to DFU mode
- fix interrupt-storm problem when dbgu is used in DFU loader
- add missing linker script for SAM7S128


git-svn-id: https://svn.openpcd.org:2342/trunk@218 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

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