SimIt-ARM was developed on IA32 Linux platform. Though not fully tested, system level simulation may also work on other major platforms, including 64-bit IA32e Linux platforms. User-level simulation may work on other 32-bit POSIX compliant platforms.
Current SimIt-ARM supports StrongARM 1100, PXA 25x, and PXA27x. Other ARM processors may also work but haven't been tested.
The easy approach to terminate normally is to use "kill" without "-9". The simulator will exit smoothly. Also, if your busybox enables poweroff or reboot, you can simply run "poweroff" or "reboot" in your simulation shell. The simulation will stop gracefully. Note the Colibri image in the release supports only "reboot".
First you need to have root privilege. Suppose your uncompressed ramdisk is named initrd8M.img. You can do the following to mount it under Linux.
mkdir mnt sudo mount -o loop initrd8M.img mnt/
Now the mnt directory has all the content of the ramdisk. You can copy new files into it, create new symbolic links or device nodes, and delete files. After you are done. Exit the director and do the following.
sudo umount mnt/ touch initrd8M.img
Now you have your modified initrd8M.img. The last "touch" command may not be necessary. However, it is safe to use it just to remind the OS that the file has been changed.
This most probably occurs when you are doing user-level simulation and your ARM program contains floating-point emulation (FPE) instructions. They are not real ARM instructions. Instead, they are coprocessor instructions meant to trigger OS faults. OS will then call the Netwinder FPE library to interpret them. It is long known that the FPE solution is inefficient and is gradually superseded by improved solutions such as soft-float compilation, or floating-point ISA extensions. Therefore, SimIt-ARM-3.0 stops providing support to such instructions at the user-level. However, if you are performing system-level simulation, the OS under simulation will take care of FPE instructions if you enabled its NWFPE feature when configuring the kernel. So you will not see this message during user-level simulation.
No, they are not supported. It is not in our plan yet.
If your program is compiled by a GCC configured for XScale, it may contain special wireless MMX instructions of XScale. These instructions are not yet supported by SimIt-ARM.
For ethernet to work, an ethernet interface card model must be built into the processor model. It is on the TODO list. Similarly, device models for LCD, touch screen, flash memory are all on the list.
It takes a lot of experience. Reading books, Linux documentation and source code will help. Below are some books that may be useful. They are ordered by difficulty level, starting from the easiest.
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If you have further questions, please contact the authors at firstname.lastname@example.org or email@example.com.