Re: [XenPPC] systemsim-gpul problems

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

On Jan 4, 2007, at 4:15 PM, Yoder Stuart-B08248 wrote:

> > -----Original Message-----
> > From: Hollis Blanchard [mailto:hollisb@xxxxxxxxxx]
> > Sent: Thursday, January 04, 2007 2:12 PM
> >
> > Have you tried attaching GDB to systemsim to figure out
> > what's going on?
> I haven't used gdb w/ the simulator yet-- I need to
> figure out how to do that.
>
> I have turned on debug prints in arch/powerpc/boot_of.c.
> One thing I'm puzzling over is why boot_of_alloc_init()
> is marking overlapping regions of memory.  Does that
> make sense??
Overlapping is fine since its a bitmap we just end up setting the bit  
redundantly.
The first thing we do is mark memory "outside of" the avail  
properties, you can find that out from systemsim with:
  systemsim % mysim of getprop [ mysim of find_device  /memory@0 ]  
available
  0000000000000000 0000000010000000.

which says that AFA FW is concerned we can do whatever we want from 0  
to 0x10000000 (which is 256M that I have mine configed with)
You should have also seen this in output:
69254: (66466): avail:
73075: (69743):   0x00, 0x010000000

I see now I should pretty that up a bit :)

>     [snip]
so first we mark from 0 to the bigining of "available" which is 0 also
>     boot_of_alloc_init: marking 0x0 - 0x0^M
This one does not make sense, is there garage that matches this in  
your available property?
>     boot_of_alloc_init: marking 0x0 - 0x400^M
We then explicitly mark the xen image itself, because we cannot  
depend on FW to claim it (tho it should).
>     boot_of_alloc_init: marking 0x400000 - 0x88b000^M
Then we explicitly remove the exception area (the first 4 pages)
>     boot_of_alloc_init: marking 0x0 - 0x3000^M
>     [snip]
>
> Also, why is there a region w/ zero length?
see above


Here is all my debug output, which _does_ make sense, but does may be  
from a different sim version.
67604: (64816): boot_of_mem_init: number of bytes in property 'reg' 16
69254: (66466): avail:
73075: (69743):   0x00, 0x010000000
76663: (73331): boot_of_alloc_init: marking 0x0 - 0x0
81799: (77651): boot_of_alloc_init: marking 0x400000 - 0x771000
141392: (136972): boot_of_alloc_init: marking 0x0 - 0x3000


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