Hi. I was looking into a failing test-case in the Zephyr project for the NMI not being processed when using TF-M.
The issue is that SCB.AIRCR.BFHFNMINS bit is not set, so the non-secure write to SCB.ICSR.NMIPENDSET is ignored.
Is this a decision that was explicitly made for the TF-M configuration to not allow the non-secure application to use the NMI handler? I could not find anything in the TF-M documentation mentioning the NMI.
Are there security concerns related to the NMI?
Joakim Andersson | Senior R&D Engineer Trondheim, Norway nordicsemi.comhttps://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.nordicsemi.com%2F&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603241347%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=axNIH9bfiD3Gfy8IyRG7nqwZK9xAmwct0OpXcAlh0HY%3D&reserved=0 | devzone.nordicsemi.comhttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdevzone.nordicsemi.com%2F&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603251297%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=jFUIsbKkjvW4z17qcEAE1y90OdkA5D4SG4GfWczoN7E%3D&reserved=0 Facebookhttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebook.com%2Fnordicsemiconductor%2F&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603261257%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=O0h9EmN358WY7ghahL7SHEcXh71BL2pbGiDJ6eYNKgU%3D&reserved=0 | LinkedInhttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fnordic-semiconductor-asa%2F&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603261257%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=IfoCPSaNetWjwQcseA5DJEveE%2F71382blsTNvGwOYes%3D&reserved=0 | Twitterhttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.com%2FNordicTweets&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603261257%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7DMtcNur2qmNhD89zW2jVEXEZMDPQwrcXY%2B0sEM8Nas%3D&reserved=0 | YouTubehttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fuser%2FNordicSemi&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603271210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=n%2FNDG%2BN%2FJqbfXB%2F1etmyVj0d5W%2Bpy9QGPstNucOFMAU%3D&reserved=0 | Instagramhttps://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.instagram.com%2Fnordicsemi%2F&data=04%7C01%7CJoakim.Andersson%40nordicsemi.no%7C0d3ed81ea8d74110a3a508d870161ca3%7C28e5afa2bf6f419a8cf6b31c6e9e5e8d%7C0%7C0%7C637382587603271210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=s%2FEb8fN1SgLYJxy53qukL7rqv9XLTE%2FaJ%2FSZT2CZO9o%3D&reserved=0
