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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 4 Apr 2017, Andre Przywara wrote:
> Hi,
> 
> On 04/04/17 20:02, Stefano Stabellini wrote:
> > Also CC'ing Andre that I think has a pine64.
> > 
> > On Tue, 4 Apr 2017, Stefano Stabellini wrote:
> >> 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.
> 
> The UART is exactly the same as in the other Allwinner SoCs, so there is
> no need for a new UART driver.
> Another issue inherited from the 32-bit Allwinner chips is that the
> first four UARTs share a page, so they have to be blacklisted, as Xen
> can't properly separate them.
> You might want to look at xen/arch/arm/platforms/sunxi.c. Not sure if
> this needs to be tied in arm64 somehow.
 
No, it doesn't, it should work on arm64 out of the box. But the platform
compatible string is different: "sun7i-a20" in sunxi.c and "sun50iw1p1"
on the pine64 dts. If the board is exactly the same, then we only need
to add "sun50iw1p1" to sunxi_dt_compat.

What do you do to boot it with Xen?

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