The reason why Huawei can't make its own Kirin processor is very clear and very general. It's not mysterious. It's not unusual. Just because Huawei only wants to do its own chip design, did not want to do its own chip manufacturing, just stepped into and integrated into the global chip technology chain industry chain, the front and back links have not entered, the self-designed chip after 32 years, never thought of manufacturing chips.
Because TSMC, which manufactures for Huawei, stopped supplying Huawei chips after September 15, 2020, Kirin chips were discontinued.
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Kirin chips are made by Taiwan Semiconductor Manufacturing Co., which is under pressure from the United States to stop making chips for Huawei in September 2020.