In every system there should be some RAM, since it is needed to store variables and the stack and heap. However, in some systems only Flash or ROM is mapped in memory at power-up and RAM needs to be enabled by software in the boot code.

With certain targets, in order to perform certain operations, Multi-ICE and RealView ICE need to download a piece of code into memory and make the core execute it. This code must be located in a writable area of memory (RAM) and needs to be accessed only by the JTAG tool.

• In Multi-ICE, this piece of code is called "cache clean code" and its address is configured in the "Processor Settings" tab of the Multi-ICE connection window.
   
• In RealView ICE, you can select the address and size of this code in the "Device" window of RVConfig, under the entries "Code Sequence Address" and "Code Sequence Size".

When you connect with a debugger to one of these targets you should ensure that RAM is mapped in memory and that the "cache clean code" or "code sequence" address is mapped correctly. You can run a script from the command line to configure the target's memory map straight after connecting to the target.

For more information please refer to the Multi-ICE and RealView ICE user guides.