Is it possible to use the Skylake Servo debug UART in Linux or Xen? It doesn't show up as a normal 16550 (setserial reports "uart type unknown"), which is making debugging the payload kernel a little frustrating.
I've added lots of "outb $0x80" calls to trace the Xen hypervisor and have figured out that the Skylake doesn't work with the x2apic, the xsave instruction or the MCE handler, but would prefer a higher bandwidth way to report progress/errors. -- Trammell -- coreboot mailing list: coreboot@coreboot.org https://www.coreboot.org/mailman/listinfo/coreboot
