It’s just a rev1 rated at 240mhz
For information see: https://www.esp32.com/viewtopic.php?f=12&t=5525
… sorry for the confusion. This is a bug in esptool.py. The chips are revision 1 silicon, but only recently have had the efuse bits set to confirm the CPU frequency rating (previously these efuses were not set).
As WiFive says your chip is revision 1 silicon, 240MHz rated. Will fix the bug in esptool.py ASAP.
/* EFUSE_RD_CHIP_CPU_FREQ_RATED : R/W ;bitpos: ;default: 1'b0 ; */ /*description: If set, the ESP32's maximum CPU frequency has been rated*/ #define EFUSE_RD_CHIP_CPU_FREQ_RATED (BIT(13)) #define EFUSE_RD_CHIP_CPU_FREQ_RATED_M ((EFUSE_RD_CHIP_CPU_FREQ_RATED_V)<<(EFUSE_RD_CHIP_CPU_FREQ_RATED_S)) #define EFUSE_RD_CHIP_CPU_FREQ_RATED_V 0x1 #define EFUSE_RD_CHIP_CPU_FREQ_RATED_S 13