The usb host controller emulations in qemu (usb-uhci & usb-ohci) use QEMUTimer for 1 millisecond timer. This precise interval is required for generating usb 1.1 frames. I currently implement usb 2.0 host controller emulation for qemu (usb-ehci). It uses QEMUTimer for generating usb 2.0 microframes of 125 microsecond. This resolution worked precisely only after compiling the host kernel with high resolution timers and dynamic ticks.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Reif Sent: Monday, December 10, 2007 3:00 PM To: qemu-devel@nongnu.org Subject: [Qemu-devel] high resolution timer question Writing data to a serial port on the sparc emulation happens immediately. I would like to throttle the write speed to match the actual baud rate. What's the best way to do this in qemu? Will QEMUTimer work for a 1 millisecond timer?
