For code development, you need an ARM toolchain (C compiler, assembler, linker, debugger). There are several choices:
> cyrille: I advise using IAR as this is the one that HP has been using. ««
If you only want to download binaries, you need the Amtel SAM-BA download program (free). Download.
If you want full-debugging capabilities, you will need a hardware ICE solution, or a debugger supporting the JTAG interface that you are using (see the hardware required section for related information. Note: most of the software tool chains above support the Amtel A91SAM-ICE and Segger J-Link unit.