ARM 11 is based on Powerful ARMv6 instruction set architecture. But I am not able to figure out if it has;
2-Sufficient RAM for porting Linux
Can someone enlighten me?
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ARM11 is an architecture. It contains an MMU. The ARM architecture itself doesn't have any RAM at all, that is dependent on the Chip you use (for an example I will assume an i.MX31 which uses the ARM11 core) and the amount of RAM you can interface via its memory controller. I know that the i.MX31 supports 256 MB (maybe eben more). Therefore this should be enough for a Linux installation.
You won't port Linux by yourself to such a chip, as this will usually be done by the chip vendor (or some subsidiary). Freescale (the vendor of the i.MX31) provides a board support package for both Linux and Windows CE (see section Run-Time Software). Of course, you are free to make improvements or changes to that basic board support package.