eCos web site is rich in documentation but here are some additional HOWTOs to get you started.

#1 Get started with eCos.

#2 Setup Eclipse / GDB to use with an Hardware debugger.

#3 Using the eCos instrumentation feature to trace kernel events or user application.

#4 Find out the bottleneck in your application with GPROF.

#5 Processor/Target emulation with QEMU [20].

#6 Framebuffer and MicroWindows on Synthetic target.