Hi, I don't understand what your problem exactly is, but I happen to have a running Keil port for ARM Cortex-M (CMSIS, Keil/IAR/GNU in fact). Take a look at it and maybe you find your problem (or use this port) http://scaprile.ldir.com.ar/cms/category/os/lwip-port/ Beyond that, check your lwipopts.h and settings internal to the application you are trying to run. Afaik those settings you mention are correct as I have them both set to 0 as the comment states; but some applications might have their own settings for their own memory allocation. Regards
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