On Tuesday, August 11, 2015 at 1:10:45 PM UTC+5:30, Ian Campbell wrote:
> On Mon, 2015-08-10 at 12:27 +0200, Michal Suchanek wrote:
> > >> I assume that all allwinner core enable in hyp mode and following
> > code
> > >> checks for hyp mode in u-boot( in start.S)
> > >
> > > HYP mode requires PSCI and HYP support in U-boot. Last I checked we don't
> > > support the H3 yet.
> > >
> >
> > I vaguely recall some patches for Xen support in u-boot.
>
> Given a u-boot which launches the kernel in HYP mode and supports PSCI
> for SMP then Xen needs nothing else special from u-boot, it can all be
> scripted in a boot.scr using the fdt comman.
>
> Ian.
Thanks! Ian
My problem is before xen start.I am not able to enter in to HYP mode.
TRY #1:
I tried using PSCI patch which is available in latest u-boot.
Let me describe the problem.after applied PSCI patch,
CPU does not switch properly to HYP mode as the execution hangs.
The problem is that the processor is already in NS SVC mode when the
armv7_switch_nonsec() is invoked: the assembly routine _nonsec_init in
nonsec_virt.S file fails when it tries to write the MVBAR register, only
accessible from a secure mode. Unfortunately the function (or some of its
instructions) cannot be simply bypassed, as it holds all the set-up needed
to be done in the secure state before actually switching to HYP mode: it
sets up vector table and registers needed to enable the hypervisor call
(hvc #0) instruction
TRY #2
Assume the my allwinner H3 board start in HYP mode so let u-boot continue to
run HYP mode using following patch in
arch/arm/cpu/start.S
mrs r0, cpsr
and r1, r0, #0x1f @ mask mode bits
teq r1, #0x1a @ test for HYP mode
bicne r0, r0, #0x1f @ clear all mode bits
orrne r0, r0, #0x13 @ set SVC mode
orr r0, r0, #0xc0 @ disable FIQ and IRQ
msr cpsr,r0
As mention in TRY #2 works for Cubieboard which has Allwinner A20 SoC but not
works for my Allwinner H3 orange pi mini 2 board.
I think allwinner people can answer this question because they know its is
possible or not to enter into HYP in Allwinner H3 device.If yes then how.
As of now I dont have contact from allwinner.
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