Ex-Qualcomm CEO Paul Jacobs joins board of UK-based Arm as the two companies battle in courtJacobs left Qualcomm in 2018 after a long tenure as CEO and executive chairman.Arm , a semiconductor technology licensing firm, said Wednesday that former Qualcomm Chief Executive Paul Jacobs has joined its board of directors — an unexpected move given that Arm and Qualcomm are embroiled in an increasingly contentious legal battle linked to high-performance processors.He left the board in March 2018 after exploring steps to take Qualcomm private following a failed hostile takeover attempt from rival Broadcom.In an interview, Jacobs said he knows Arm well from being a customer for years, both at Qualcomm and his current wireless technology company, XCOM Labs.Stacy Rasgon, an analyst the Bernstein Research, said the dispute between the two long-time partners is puzzling because Qualcomm is driving the expansion of Arm’s footprint into new markets such as connected cars and laptops."