Hi Alex, On 03/10/2015 09:12 PM, Alex Sun wrote: > I downloaded QEMU 2.2.0, and built a qemu-system-arm from there. > I loaded a versatile kernel 2.6.32.5 and my own file system. > > #qemu-system-arm -pidfile /tmp/qemu_0_pids/0.pid -M versatilepb -option-rom > efi-rtl8139.rom -initrd newinitrd -kernel vmlinuz-2.6.32-5-versatile -append > "root=/dev/sda1 console=ttyAMA0" -hda new.qcow2 -drive file=fat:rw:./data > -nographic -no-reboot > > I see following message while the kernel is booting: > > [ 3.873429] dev:f1: ttyAMA0 at MMIO 0x101f1000 (irq = 12) is a AMBA/PL011 > [ 3.884631] console [ttyAMA0] enabled > [ 3.889783] dev:f2: ttyAMA1 at MMIO 0x101f2000 (irq = 13) is a AMBA/PL011 > [ 3.890646] dev:f3: ttyAMA2 at MMIO 0x101f3000 (irq = 14) is a AMBA/PL011 > > I think the serial ports of ttyAMA[0-2] are enabled. > Then I try to do serial redirection: > > #qemu-system-arm -pidfile /tmp/qemu_0_pids/0.pid -M versatilepb -option-rom > efi-rtl8139.rom -initrd newinitrd -kernel vmlinuz-2.6.32-5-versatile -append > "root=/dev/sda1 console=ttyAMA0" -hda new.qcow2 -drive file=fat:rw:./data > -nographic -no-reboot *-serial stdio -serial pty* > > However, I get error message: > QEMU 2.2.0 monitor - type 'help' for more information > *(qemu) qemu-system-arm: -serial stdio: cannot use stdio by multiple character > devices* > > It's weired to me. I don't think there is another one other than qemu itself > holding the stdio.
I think the conflict is that when you specify -nographic, the QEMU monitor uses stdio. I find it necessary to add "-monitor none" to all of my command lines. Regards, Chris -- Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
