- The SoC is built around the Tensilica Xtensa LX3 processor (see the compiler info in the library binaries)
- The CPU is clocked at 80 MHz (esp_iot_sdk_v0.6/include/eagle_soc.h, line 58)
There are readily available compilers for the Xtensa platform (linux-xtensa-gcc via kernel.org), but disassembling binaries may be tricky due to Tensilica Instrunction Extensions (but an linux-xtensa-objdump is freely available via kernel.org).