Here is the list of known bugs in the GNUPro toolkit as it relates to eCos:
The simulators built into GDB have a memory leak when repeatedly loading and running different binaries. After a certain number of loads, there can be a VM allocation failure.
Work around: always re-run GDB when you wish to load a different binary.
When CygMon is running in command line mode, the load instruction to GDB does not function correctly.
Workaround: use GDB instead of CygMon to load executables.