Re: [Xen-devel] ARM:Booting xen on pine64 board

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Sat, 1 Apr 2017, bharat gohil wrote:
> Hello

Hello Bharat, thanks for your email.


> I am trying to boot xen(debug build) on pine64 ARM64 based board but its 
> hangs at following position,
> 
> - UART enabled -
> - CPU 00000000 booting -
> - Current EL 00000008 -
> - Xen starting at EL2 -
> - Zero BSS -
> - Setting up control registers -
> - Turning on paging -
> - Ready -
> (XEN) Checking for initrd in /chosen
> (XEN) RAM: 0000000041000000 - 000000007fffffff
> (XEN)
> (XEN) MODULE[0]: 000000007e200000 - 000000007e202000 Device Tree
> (XEN) MODULE[1]: 000000007e400000 - 000000007ef46a00 Kernel       
> console=hvc0 ro root=/dev/mmcblk0p2 clk_ignore_unused rootwait
> (XEN)  RESVD[0]: 000000007e200000 - 000000007e202000
> (XEN)
> (XEN) Command line: dtuart=serial0 earlyprint loglvl=all conswitch=x 
> dom0_mem=128M
> (XEN) Placing Xen at 0x000000007fc00000-0x000000007fe00000
> (XEN) Update BOOTMOD_XEN from 000000007fe00000-000000007fefad81 => 
> 000000007fc00000-000000007fcfad81
> (XEN) Booting using Device Tree
> (XEN) Domain heap initialised
> (XEN) Platform: Generic System
> (XEN) Looking for dtuart at "serial0", options ""
>  Xen 4.9-unstable
> (XEN) Xen version 4.9-unstable (bgohil@) (aarch64-linux-gnu-gcc (Linaro GCC 
> 6.2-2016.11) 6.2.1 20161016) debug=n  Tue Mar 28 16:12:32 IST 2017
> (XEN) Latest ChangeSet: Fri Mar 24 14:19:47 2017 +0100 git:5b08f85
> (XEN) Processor: 410fd034: "ARM Limited", variant: 0x0, part 0xd03, rev 0x4
> (XEN) 64-bit Execution:
> (XEN)   Processor Features: 0000000000002222 0000000000000000
> (XEN)     Exception Levels: EL3:64+32 EL2:64+32 EL1:64+32 EL0:64+32
> (XEN)     Extensions: FloatingPoint AdvancedSIMD
> (XEN)   Debug Features: 0000000010305106 0000000000000000
> (XEN)   Auxiliary Features: 0000000000000000 0000000000000000
> (XEN)   Memory Model Features: 0000000000001122 0000000000000000
> (XEN)   ISA Features:  0000000000011120 0000000000000000
> (XEN) 32-bit Execution:
> (XEN)   Processor Features: 00000131:00011011
> (XEN)     Instruction Sets: AArch32 A32 Thumb Thumb-2 Jazelle
> (XEN)     Extensions: GenericTimer Security
> (XEN)   Debug Features: 03010066
> (XEN)   Auxiliary Features: 00000000
> (XEN)   Memory Model Features: 10201105 40000000 01260000 02102211
> (XEN)  ISA Features: 02101110 13112111 21232042 01112131 00011142 00011121
> (XEN) Using PSCI-0.2 for SMP bringup
> (XEN) SMP: Allowing 4 CPUs
> (XEN) Generic Timer IRQ: phys=30 hyp=26 virt=27 Freq: 24000 KHz
> (XEN) GICv2 initialization:
> (XEN)         gic_dist_addr=0000000001c81000
> (XEN)         gic_cpu_addr=0000000001c82000
> (XEN)         gic_hyp_addr=0000000001c84000
> (XEN)         gic_vcpu_addr=0000000001c86000
> (XEN)         gic_maintenance_irq=25
> (XEN) GICv2: 224 lines, 4 cpus, secure (IID 0200143b).
> (XEN) Using scheduler: SMP Credit Scheduler (credit)
> 
> but when I boot dtuart=<unknown value> say duart=xyz instead of 
> dtuart=serial0, xen booted successfully but Dom0 crash while probing 
> 'serial0' driver. 
> 
> If I remove 'serial0' node from device tree, Dom0 boot successfully but 
> unable to enter input into 'hvc' console. 
> 
> what could be wrong here or missing something?

What is your dom0 command line? Are you passing console=hvc0?

It looks like pine64 is using an allwinner sun50i-uart, for which we
don't have a proper driver in Xen yet. That is probably the reason why
you can see some output from Xen, but you cannot type anything in later
in Dom0 (which is sent to Xen via the HVC console).  Please send a patch
to add a simple sun50i-uart driver (see xen/drivers/char/). Given that
both Xen and Linux are GPLv2, you can import code from Linux if you find
it appropriate.

Cheers,

Stefano

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