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

[Denis Obrezkov <denisobrezkov@xxxxxxxxx>]

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

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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