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Simulator: Mapping filesystem to not existent memory area

Martin Gerth

I would like to test file-system related functions using the simulator. The real hardware (AT91SAM7S) accesses an external SPI-Flash containing the file system. In the simulator, i wanted to MAP the filesystem image using the LOAD and MAP command to memory address 0x400000 (which does not exist on the real hardware). When I access this region during simulator runtime, i get the following error message:

Data Abort: ARM Instruction at 002014B4H, Memory Access at 00400000H

which is a trap of the arm core which would be correct on the real system, but which makes it impossible for me to simulate my file system.

Is there a way to disable the abort trap, or does anyone know another solution to simulate a file system?

Thanks!

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  • 0 in reply to Eugen Mailaender

    Hi Eugen

    Thanks for your reply. Thats a good idea, but my filesystem is 4MB which doesnt fit in this area.

    Actually I found a workaround. I load the whole filesystem to address 0x400000 and instead of accessing this memory directly, I rewrote the memory access function of my filesystem to call a simulator function, which copies a memory block from the filesystem memory to a location in the ram. I can then access the data in the ram. Its a bit tricky but it works fine too.

    Martin

Reply
  • 0 in reply to Eugen Mailaender

    Hi Eugen

    Thanks for your reply. Thats a good idea, but my filesystem is 4MB which doesnt fit in this area.

    Actually I found a workaround. I load the whole filesystem to address 0x400000 and instead of accessing this memory directly, I rewrote the memory access function of my filesystem to call a simulator function, which copies a memory block from the filesystem memory to a location in the ram. I can then access the data in the ram. Its a bit tricky but it works fine too.

    Martin

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