maple Chou wrote:
Dear All,
I just doing my floppy toy-os project(include little bootloader). And
test with qemu.
The Floppy Image is here http://file.maple.tw/mapleos/floppy.img
My problem is when I turn on the SMP option. (qemu -fda floppy.img -smp 2)
The system will hang on bootsector (i just watch qemu monitor hang on
0x7eca)
And some problem with Grub+floppy image.
Grub+HD image boot successful, but can't capture the keyboard.
What's problem!?? i only run SMP case successful with linux kernel.
For your project, qemu should be considered a _tool_. Like all tools,
you must know it's usefulness (it's easier to debug your OS on an
emulator) but you must be very well aware that all emulators are
accurate only up to a certain point of the actual system emulated. This
is not to mention that qemu is not yet complete (latest official release
is 0.8.2), there are known bugs and unimplemented features that could
always be the source of the problem. Finally, even if qemu is able to
boot many common SMP enabled OSes, it's not a guarantee that everything
is perfect related to SMP in qemu.
If you believe that your code is correct and this is a bug in qemu,
which is always possible, try with different PC emulators to see if
there is a difference. The best thing to do is to actually test on a
real SMP system, real hardware have a final say on what should work and
what doesn't.
Finally, developing an OS is not a small task, perhaps you should focus
on single processor systems first which are a lot easier to design and
debug for and then focus on SMP systems later on.
Regards,
- Jonathan
Best Regards
~maple
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