Re: [Xen-users] How to build Mini-OS for ARM

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 4 Jun 2019, Denis Obrezkov wrote:
> Hi,
> 
> > Where does it hang exactly? I don't use QEMU with a debugger often, but
> > you can connect gdb to QEMU if that's what you'd like to do. Normally, I
> > just add enough printks to Xen to figure out where it gets stuck. It is
> > pretty easy because if it's an early boot hang, then it is still all
> > single threaded and easy to follow.
> 
> I wrote it in another thread. When I launch it with the command:
> 
> ~/bin/qemu-3.1.0/arm-softmmu/qemu-system-arm -machine virt,gic_version=2
> -machine virtualization=true  -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

You need gic_version=3, version 2 doesn't have support for
virtualization in QEMU.
Please give a try to the command I posted in my previous email.


> I got:
> 
> Starting kernel ...
> 
> - 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) Looking for dtuart at "/pl011@9000000", options ""
>  Xen 4.12.0
> (XEN) Xen version 4.12.0 (reprofy@local) (arm-linux-gnueabi-gcc (Debian
> 8.2.0-20) 8.2.0) debug=n  Mon Jun  3 13:25:10 CEST 2019
> (XEN) Latest ChangeSet:
> (XEN) Processor: 412fc0f1: "ARM Limited", variant: 0x2, part 0xc0f, rev 0x1
> (XEN) 32-bit Execution:
> (XEN)   Processor Features: 00001131:00011001
> (XEN)     Instruction Sets: AArch32 A32 Thumb Thumb-2 ThumbEE Jazelle
> (XEN)     Extensions: GenericTimer
> (XEN)   Debug Features: 02010555
> (XEN)   Auxiliary Features: 00000000
> (XEN)   Memory Model Features: 10201105 20000000 01240000 02102211
> (XEN)  ISA Features: 02101110 13112111 21232041 11112131 10011142 00000000
> (XEN) Generic Timer IRQ: phys=30 hyp=26 virt=27 Freq: 62500 KHz
> (XEN) GICv2m extension register frame:
> (XEN)         gic_v2m_addr=0000000008020000
> (XEN)         gic_v2m_size=0000000000001000
> (XEN)         gic_v2m_spi_base=80
> (XEN)         gic_v2m_num_spis=64
> (XEN) GICv2 initialization:
> (XEN)         gic_dist_addr=0000000008000000
> (XEN)         gic_cpu_addr=0000000008010000
> (XEN)         gic_hyp_addr=0000000008030000
> (XEN)         gic_vcpu_addr=0000000008040000
> (XEN)         gic_maintenance_irq=25
> (XEN) GICv2: 288 lines, 1 cpu (IID 00000000).
> (XEN) Using scheduler: SMP Credit Scheduler rev2 (credit2)
> (XEN) Initializing Credit2 scheduler
> 
> -- 
> Regards, Denis Obrezkov
> 
> 
>

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