Re: [Xen-users] ARM: Xen on Vexpress

[Jeenu Viswambharan <Jeenu.Viswambharan@xxxxxxx>]

On Thu, Jun 12, 2014 at 11:17:43, Ian Campbell wrote:
> On Thu, 2014-06-12 at 10:44 +0100, Jeenu Viswambharan wrote:
> > On Wed, Jun 11, 2014 at 17:36:02, Ian Campbell wrote:
> > > (XEN) Populate P2M 0xa8000000->0xb0000000 (1:1 mapping for dom0)
> > > (XEN) Loading kernel from boot module 2
> > > (XEN) Loading zImage from 00000000a0008000 to 
> > > 00000000afc00000-00000000aff26fb8
> > > (XEN) Loading dom0 DTB to 0x00000000afa00000-0x00000000afa02f10
> > >
> > > In that message 0xa0008000 is the *source* address (which makes
> > > sense, since that is where you loaded it to). The kernel is being
> > > loaded to address 0xafc00000 within dom0 RAM, which spans
> > > 0xa8000000->0xb0000000.  That load address is about where I would
> > > expect given the constraints (just under 128M).
> >
> > I now get that Xen moves the kernel image to 0xafc00000 (PA), and
> > DTB to 0xafa00000 (PA).
> >
> > Few questions:
> >
> >   - What does P2M stand for, and what is it?
>
> "physical to machine". It's the Xen term for what you would call the
> second stage paging.

OK, good to know.

> >   - What does DOM0 see as its PC at entry?
>
> The load address of the kernel image, since the zImage protocol
> requires us to enter the kernel at that offset.

I managed to break at eret before guest entry, and the PC is 0xafc00000
itself. It does fail to boot bare metal too from that address. I'll see
if I can find what's going wrong.

Thanks.

--
Jeenu

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