I want to learn about uclinux os. I will use just a lpc2138 chip for my project. I don't kown if the lpc2138's resource is enough for this work.I don't want to add other sram and flash on my board. I don't kown how much flash and sram uclinux os will used. I am a newbie.
Well, you asked about resources and the LPC2138 does not have the memory resources. 512KiB flash may be big enough to store a bare-bones kernel, buy 32KiB RAM is certainly not enough. Google for "uclinux footprint".