RTEMS available tasks

Andre Marques andre.lousa.marques at gmail.com
Wed Jan 29 13:29:30 UTC 2014

On 01/29/14 07:03, Sebastian Huber wrote:
> On 2014-01-28 19:46, Andre Marques wrote:
>> On 01/28/14 14:34, Sebastian Huber wrote:
>>> On 2014-01-28 15:30, Andre Marques wrote:
>>>> Well, for me Qemu seems to be having some problems with the output, 
>>>> because I
>>>> can set breakpoints, and run the code on the remote target, but 
>>>> Qemu doesn't
>>>> show any output (with -nographic, and different consoles), or shows 
>>>> the output
>>>> for the program passed with the -kernel parameter, regardless of 
>>>> what gdb says
>>>> that is printing.
>>>> For now I guess I'm leaving this as it is, as I've tried for 
>>>> several hours
>>>> already to make the output work.
>>>> On pc386 the -S option leads to a fatal error, because when loading 
>>>> the program
>>>> it seems to load it on the Bios memory space. If I dont use that 
>>>> option all
>>>> seems to work. As for arm, I could't get any output.
>>> Which Qemu version do you use?  I normally use the latest Git version.
>>> If you omit the -nographic option, then you need "-serial stdio".
>>> The output appears on the terminal running Qemu (not the GDB terminal).
>> I'm using Qemu 1.5.3 from the Gentoo repositories.  It runs the 
>> program (passed
>> with -kernel), then stays with "Any key to reboot...". Meanwhile I 
>> can connect
>> to Qemu with gdb, load some other program and then Qemu shows 
>> nothing, just
>> waits again.
>> I'm using:
>> qemu-system-i386 -m 256M -kernel hello.exe -s -serial stdio
> I doubt this will work on i386 Qemu.  Here you need a boot loader, 
> e.g. GRUB. That is one of reasons I don't use the i386 Qemu.  I would 
> use the arm/realview_pbx_a9_qemu BSP with the latest Git version of Qemu.

qemu-system-i386 -kernel <program>.exe -no-reboot

  it runs the program, gives the output just fine and exits (as the 
pc386 script, just on a GUI), the problem only starts if I try to debug 
with gdb and load several programs on the same Qemu run.

For pc386 I could only have output with the GUI interface, with 
-nographic I had no luck.

About GRUB I also tried it but I think It's more work when the command 
above does the same. On the wiki there is no mention for the need to 
change the (hd#) numbers on the grub.conf which causes the grub shell to 
appear instead of the boot menu, and also doesn't mention the option above.

How can I add a note on the wiki?

About debugging I hadn't much luck with pc386, so I followed your 
suggestion and installed Qemu from the latest Git and tested it with 
arm/realview-pbx-a9 BSP.

Two issues there:

- The loaded program never stops running;
- I can't load another program on the same Qemu run with GDB, It always 
runs the program loaded initially (this also happened on pc386, so it 
must be something on GDB).

I'm running GDB like this:

tar remote :1234
continue (have to do Ctrl-c, because it doesn't stop running after this)

To load another program:
monitor system_reset
continue (just resumes the initially loaded program instead)

Thanks for the help so far Sebastian.

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