Hello

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?

-- 
Regards,
Bharat Gohil
Sr.Software Engineer
bharat.gohil@harman.com
+919427054633