Re: [Xen-users] Booting Xen on qemu-arm

[Denis Obrezkov <denisobrezkov@xxxxxxxxx>]

Hi Julien,
> This maybe because Xen crashed before the console is setup. You can
> compile Xen with earlyprintk.
>
> Can you provide the command line you use to build Xen?
>

I've just built Xen with debugging on and found out the reason why it
didn't work:

Starting kernel ...

- UART enabled -
- CPU 00000000 booting -
- CPU doesn't support the virtualization extensions -
- Boot failed -

My command line was:

~/bin/qemu-3.1.0/arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine
virt -m 512M -bios u-boot.bin -device
loader,file=xen-uImage,force-raw=on,addr=0x46000000 -device
loader,file=zImage,addr=0x45000000 -nographic -no-reboot -chardev
socket,id=qemu-monitor,host=localhost,port=7777,server,nowait,telnet
-mon qemu-monitor,mode=readline

I modified if to:

-machine virt,gic_version=3 -machine virtualization=true

so, now I get further:

- UART enabled -
- CPU 00000000 booting -
- Xen starting in Hyp mode -
- Zero BSS -
- Setting up control registers -
- Turning on paging -
- Ready -
(XEN) Checking for initrd in /chosen
(XEN) RAM: 0000000040000000 - 000000005fffffff
(XEN)
(XEN) MODULE[0]: 0000000040000000 - 0000000040002000 Device Tree
(XEN) MODULE[1]: 0000000045000000 - 0000000045853200 Kernel     
(XEN)  RESVD[0]: 0000000040000000 - 0000000040002000
(XEN)
(XEN) CMDLINE[0000000045000000]:chosen earlyprintk=serial,ttyAMA0
console=ttyAMA0,115200n8 earlycon=xenboot
(XEN)
(XEN) Command line: console=dtuart dtuart=/pl011@9000000
(XEN) Xen heap: 000000005e000000-0000000060000000 (8192 pages)
(XEN) Dom heap: 122880 pages
(XEN) Domain heap initialised
(XEN) Booting using Device Tree
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Unable to find compatible GIC in the device tree
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...

Though, there is a node from my device tree:

intc@8000000 {
        phandle = <0x00008001>;
        interrupts = <0x00000001 0x00000009 0x00000004>;
        reg = <0x00000000 0x08000000 0x00000000 0x00010000 0x00000000
0x080a0000 0x00000000 0x00f60000>;
        #redistributor-regions = <0x00000001>;
        compatible = "arm,gic-v3";
        ranges;
        #size-cells = <0x00000002>;
        #address-cells = <0x00000002>;
        interrupt-controller;
        #interrupt-cells = <0x00000003>;
    };

I trued to boot with gic_version=2, but also stuck:

...

(XEN) GICv2: 288 lines, 1 cpu (IID 00000000).
(XEN) Using scheduler: SMP Credit Scheduler rev2 (credit2)
(XEN) Initializing Credit2 scheduler

My guess that here might be a problem with Dom0.


-- 
Regards, Denis Obrezkov

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