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

[Jeenu Viswambharan <Jeenu.Viswambharan@xxxxxxx>]

On Wed, Jun 11, 2014 at 17:36:02, Ian Campbell wrote:
> On Wed, 2014-06-11 at 17:28 +0100, Jeenu Viswambharan wrote:
> > On Wed, Jun 11, 2014 at 17:24:49, Ian Campbell wrote:
> > > It's all the Xen output from before this which I am interested in.
> > > Since that answers the questions I have about where Xen has placed
> > > guest RAM etc.
> >
> > OK, Xen logs attached.
>
> Thanks. These contain:
>
> (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?
  - What does DOM0 see as its PC at entry?
  - Is DOM0 FDT's memory node modified at all, move base IPA or shrink
    size etc.? Or Does DOM0 still see the RAM at 0x80000000 to
    0xc0000000?

--
Jeenu

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