I fail to see where the problem is. lwIP does not require an OS, as long as you can compile C code you are fine. A port is basically what you described, you write your driver, you read this: http://www.nongnu.org/lwip/2_1_x/group__sys__layer.html you modify architecture dependent files, and you put them in arch/; see how others did it in the 'contrib' tree: contrib/ports/freertos/include/arch contrib/ports/win32/include/arch contrib/ports/unix/port/include/arch if you want to see how it is done for bare metal, then get a port for a Cortex-M, search the wiki or look me up, there is one (old) in my webpage.
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