Hi Antonio, > From: Antonio Huete Jiménez [mailto:tuxi...@quantumachine.net] > Sent: Wednesday, 16 March 2016 3:40 PM > > Hi, > > I am experiencing what I think it's an issue with -M raspi2 and > interrupts in a baremetal application. > > According to this document > (https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2 > 836/QA7_rev3.4.pdf), and if I understood it correctly, you can enable timer > interrupts for core0 by setting bit 0 at 0x40000040 and you can trigger them > by using the ARM Generic > Timer. > > With this procedure I can reliably trigger that timer interrupt in the > real hardware by setting CNTP_CTL and CNTP_TVAL but on qemu it doesn't > seem to be triggered. > > Can somebody please tell me what I might be doing wrong?
I don't think you're doing anything wrong; we just don't model this timer hardware yet (neither Linux nor Windows needs it). If you want to take a stab at adding it, the relevant hardware emulation is hw/intc/bcm2836_control.c. If you're willing to use different timer sources, then I suggest looking at the ARM per-core timers. I also have Gregory's emulation code for the other bcm2835 timers in my private github, and I hope to submit to upstream qemu after the current freeze, since it is needed for pi1 Linux support. Cheers, Andrew
