Re: [Xen-devel] ARM bare metal application test

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, May 09, 2016 at 05:47:38PM +0100, Julien Grall wrote:
> 
> 
> On 09/05/16 17:43, Ivan Pavić2 wrote:
> >Hello Julien,
> 
> Hello Ivan,
> 
> >
> >Julien Grall wrote:
> >>Guest are booting with MMU disabled, so 0x80008000 will be the physical
> >>address.
> >
> >>The toolstack will load the kernel at this physical address. However,
> >>the start of the guest RAM for Xen 4.7 is 0x40000000 (see
> >>include/public/arch-arm.h). Can you try to use 0x40008000 for the guest
> >>address?
> >
> >I changed address. It seems the problem is solved because PC is now
> >40008030 (that is address of "work: b work" i think).
> 
> You can figure out the associated instruction with objdump.
> 
> >
> >>By the way, how much RAM did you give to the guest?
> >
> >I wrote "memory = 32" in cfg file, I think that stands for 32 MB?
> 
> Correct, so the end of the RAM bank would be 0x42000000. I am a bit
> surprised that the toolstack does not complain when trying to load the
> kernel at 0x80008000.
> 

I don't think toolstack tries to load kernel to that guest physical
address -- reading from Ivan's log it suggests toolstack loaded the
kernel to 0x40008000.

That (0x8000800) is the address set in PC, right?  I don't think
toolstack is in a position to sanitise that nor should it care.

Wei.

> Can you paste the dump of xl -vvv create... ?
> 
> Regards,
> 
> -- 
> Julien Grall

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