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The QP-nano Development Kit (QDK-nano) for the PSoC1 is available on SourceForge.net as "legacy-QDK". Specifically, please look for the qdkn_psoc-iccm8c_4.0.02.zip file. The ZIP file contains documentation manual in PDF.
The newer PSoC4 and PSoC5 platforms are supported through the ARM Cortex-M ports, which are included in the baseline QP/C distribution.