Re: [Qemu-ppc] Problem booting qemu-system-ppc with cpu e500XX and machine mpc8544ds

[Badrinath Sriman]

>
> Does it mean that the lbz instruction is not emulated? I saw in the qemu code 
> base that it was emulated.

No, it means that your guest is trying to access memory that is out of its 
initial TLB mapping, but it didn't set up IVPR+IVOR vectors to handle page 
faults yet.

Either try and see if it works with current git from 
git://git.qemu.org/qemu.git or check out mmubooke_create_initial_mapping in 
hw/ppce500_mpc8544ds.c and increase the map size.


I tried from the git, but still the problem continues. I went through the 
function mmubooke_create_initial_mapping to try and increase the map size. So 
far, I have only been a qemu user and hence I do not have a reasonable 
understanding of qemu code base/flow. 
To increase the TLB map size, I tried changing the following line inside this 
function:

ps = booke206_page_size_to_tlb(dt_end) + 1;

I tried different increments like 2 and 4, instead of 1 like
ps = booke206_page_size_to_tlb(dt_end) + 2;
ps = booke206_page_size_to_tlb(dt_end) + 4;

The "info tlb" inside qemu monitor which initially showed TLB size as 64M, now 
show 512M (when I changed it to 4).

But the hang problem still continues. Hence, the problem may be that I am not 
doing the proper change for increasing the TLB map size. 

I also saw that recently you have committed a patch related to TLB sizing, as 
given in 

http://lists.gnu.org/archive/html/qemu-ppc/2012-06/msg00255.html.

The head version that i am trying also has this fix. 

So, please advise on what variable/line to modify to increase the TLB map size.

Thanks
Badri.