Hey, As was discussed over yocto/OE-Core mailing list https://lists.openembedded.org/g/openembedded-core/topic/113306017#msg217258 qemu machine with USB and KVM enabled goes into reset loop with u-boot. I've tested u-boot 2025.04 and latest master branch 2025.07-rc3 ( b22a276f039f818d5564bec6637071cfc8a7e432 ) with qemu_arm64_defconfig from tree and CONFIG_BLOBLIST disabled since that to has issues with KVM ( https://lists.denx.de/pipermail/u-boot/2025-May/590101.html )-
To reproduce: * qemu 10 or 8.2.2, version does not seem to matter * aarch64 native machine with KVM support * qemu-system-aarch64 command line: $ qemu-system-aarch64 -machine virt -cpu host -machine gic-version=3 -smp 1 -enable-kvm \ -m 256 -serial mon:stdio -serial null -nographic -vga none \ -bios u-boot.bin \ -device qemu-xhci -device usb-tablet -device usb-kbd U-Boot 2025.07-rc3 (May 30 2025 - 19:44:05 +0000) DRAM: 256 MiB using memory 0x4e662000-0x4f6a2000 for malloc() Core: 51 devices, 14 uclasses, devicetree: board Flash: 64 MiB Loading Environment from Flash... *** Warning - bad CRC, using default environment In: serial,usbkbd Out: serial,vidconsole Err: serial,vidconsole Register 8001040 NbrPorts 8 Starting the controller "Synchronous Abort" handler, esr 0x96000010, far 0x10100040 elr: 000000000005a360 lr : 000000000005a344 (reloc) elr: 000000004f6fc360 lr : 000000004f6fc344 x0 : 0000000010100040 x1 : 0000000000000001 x2 : 0000000000000000 x3 : 0000000000003e80 x4 : 0000000000000038 x5 : 000000004e66fed2 x6 : 0000000000000000 x7 : 0000000000000000 x8 : 0000000000000000 x9 : 000000000001869f x10: 000000000000000d x11: 0000000000000006 x12: 000000004e561a68 x13: 000000004e561dd0 x14: 0000000000000002 x15: 0000000000000000 x16: 000000004f6ee774 x17: 0000000000000000 x18: 000000004e661dd0 x19: 000000004e670480 x20: 0000000000000000 x21: 0000000010100040 x22: 0000000010100000 x23: 0000000000000000 x24: 0000000000000000 x25: 0000000000000000 x26: 0000000000000000 x27: 0000000000000000 x28: 0000000000000000 x29: 000000004e670360 Code: d5033fbf aa1503e0 5287d003 52800002 (b8004401) Resetting CPU ... resetting ... With KVM disabled, or the qemu USB devices disabled, boot with u-boot prompt and to full target system works. Cheers, -Mikko
