[Barrelfish-users] Troubles using Barrelfish into GEM5

[Samuel Hitz]

Hi Rafael

Sorry I actually wanted to forward the mail only to the barrelfish mailing
list and not the gem5...

One thing you could do is copy the Realview.py in the tools/arm_gem5 which
still includes the VExpres_VLT board to the gem5 src directory. You would
have to make some minor adjustments to the file and also to the
gem5script.py since they recently changed their bussystem. The thing with
gem5 is that they change a lot of code in every release so that you have to
constantly adapt and possibly fix new bugs, that's why we decided on a
fixed release.

If you don't want to do that then you'd have to change all the hardcoded
addresses which you already did (some atleast), but maybe you'd have to do
more. The VExpress_EMM board has a special memory and device layout and I
have never tested it for that board. The RealViewPBX however should work
out of the box with the relevant modifications to the device addresses.

This warnings about accessing the spsr in invalid mode you can ignore for
now. I have to look into that sometime, but it doesn't affect the execution
of barrelfish.

As for debugging you can use the remote debug functionality of gem5 (see
the wiki). I included a gdb script in tools/arm_gem5 which tries to connect
to gem5 on the default port and sets some configuration stuff needed in
order to get it working. If you need to start debugging right from the
beginning you have to set 'rgdb_wait' in gem5/src/sim/system.cc to 0 and
recompile the binary. That way gem5 waits with the execution of the
simulated code until a debugger is attached.

I hope this helps.

Cheers,

Samuel


On 20.06.2012, at 20:58, Rafael Garibotti <rafaelgaribotti at gmail.com> wrote:

Hi Samuel,

     Yes, you were right. I run hake.sh with the arm_gem5 parameter and
then run make without the arm parameter.

     So, running Barrelfish on the old GEM5 revision (d45a02bd5391) with
the VExpress_ELT platform, it works. But as I said before, the new GEM5
revision (64db8473f3ab) do not have this platform. So I started to port it
to another platform by changing the parameters found in the
"barrelfish/kernel/arch/arm_gem5" directory, as the INITRD_BASE on the
init.c file according to ramdisk address, or the PIT_BASE on the
integrator.c file according to timer (Sp804) address, and so on...

     But even with these changes, the Barrelfish did not pass the boot, at
least, it shows not message after "info: Entering event queue @ 0.
Starting simulation..." in a terminal and "==== m5 slave terminal: Terminal
0 ====" on another. So how do you debug Barrelfish on GEM5??

     By the way, I always get the warning "warning: Trying to access an
SPSR in invalid mode: 31". Was it not related to the ISA? Such an
instruction not supported on ARMv7 that was suported on ARMv5... So, do you
have a guess about it?

Ps.: You included only on the GEM5 mailing list, so I put also in the
Barrelfish mailing list.

Best Regards,
Rafael Garibotti


2012/6/19 Samuel Hitz <samuel.hitz at gmail.com>

> Hi Rafael,
>
> Did you build Barrelfish with 'make arm'? If not please try this and see
> if it works. It seems like romfs_cpio_archive_size in
>         phys_mmap_remove(&phys_mmap,
>          INITRD_BASE,
>          INITRD_BASE + romfs_cpio_archive_size);
>
> in init.c:arch_init is 0 which happens if you don't build Barrelfish with
> 'make arm'.
>
> Cheers,
>
> Samuel
>
> (adding barrelfish-mailing list. You should ask questions there so that
> everyone can possibly answer you or gain something from the solutions
> posted)
>
> On Tue, Jun 19, 2012 at 4:47 PM, Rafael Garibotti <
> rafaelgaribotti at gmail.com> wrote:
>
>> Hi Samuel,
>>
>>      I tried using the GEM5 simulator with the Barrelfish, but I always
>> got the same error:
>>
>> -------------------------------------------------------------------
>> Barrelfish CPU driver starting on ARMv7 Board id 0x000008e0
>> The address of paging_map_kernel_section is 0xc0022e00
>> kernel PANIC! kernel assertion "limit > start" failed at
>> ../kernel/arch/arm/phys_mmap.c:130
>> -------------------------------------------------------------------
>>
>>      Do you know how I can fix this problem?
>>
>>      I tried using the latest GEM5 revision (64db8473f3ab), but I saw
>> that the platform used (VExpress_ELT) is no longer available, so before
>> starting to migrate to another platform (i.e. RealView_PBX), I took the
>> version indicated in the README file (d45a02bd5391) and even making the
>> changes indicated, the error shown above remains.
>>
>>      So, I tested the RealView_PBX platform and I needed to change the
>> memory size to not have two devices with the same address. After that, the
>> Barrelfish starting the simulation as shown below, but unfortunately it
>> doesn't boot... :( ... That means I need to change the bootloader... So do
>> you have any tips on how to proceed before I start looking for it?
>>
>> -------------------------------------------------------------------
>> ..... STARTING SIMULATION
>> info: Entering event queue @ 0.  Starting simulation...
>> -------------------------------------------------------------------
>>
>>      Thank you!!
>>
>> Best Regards,
>> Rafael Garibotti
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://lists.inf.ethz.ch/pipermail/barrelfish-users/attachments/20120620/919b90a1/attachment-0001.html