https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291537
Anton Povalikhin <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #7 from Anton Povalikhin <[email protected]> --- Root cause found and fix proposed: https://github.com/freebsd/freebsd-src/pull/2442 On Arrow Lake (S/HX) platforms, reading the undecoded port 0x84 causes a hard platform reset. rtcin_locked()/rtcout_locked() in sys/x86/isa/atrtc.c read inb(0x84) as an I/O delay on every CMOS access, so the machine resets in atrtc attach (or earlier, in the VGA probe's rtcin(RTC_EQUIPMENT)). Verified on MSI Vector 17 HX AI (Core Ultra 9 275HX, HM870, BIOS E17S3IMS.112, pure UEFI): a single inb(0x84) or inb(0x85) resets the machine immediately; the CMOS ports 0x70/0x71 themselves work (register A reads 0x26), as do ports 0x80, 0x81, 0x8f, 0x61 and 0x3d4. Replacing the port read with cpu_lock_delay() makes GENERIC 15.1 boot without any hints. With the fix applied the "atrtc1: Warning: Couldn't map I/O." line still appears but is only cosmetic. The PR also carries two small related changes: vga_isa honours hint.vga.N.disabled in the identify routine, and ig4 gets the Arrow Lake-S/HX LPSS I2C IDs (0x7f4c-0x7f4f, 0x7f7a, 0x7f7b) for the touchpad. -- You are receiving this mail because: You are the assignee for the bug.
