Hi Roberto,
Roberto Rodríguez-Rodríguez wrote:
Hi, I am specifying the architecture for an academic microprocessor, we
want that this microprocessor will be able to run a Linux version, so I
need to know the minimum requirements (the minimum instruction set) for
running a ucLinux because this will define the minimum architecture.
Could any body help me? I have not found this minimum requirements.
Thank You!
At first thought the bare essentials are probably
* 32 bit data path
* hardware interrupt (for the timer)
* and GCC support.
GCC support will really define your minimum instruction set. If GCC can
target it, you can probably run Linux on it.
Other nice to haves
* software exception / break / trap instruction (and associated CPU
mode) for system calls, althought you can fake these with a regular branch
* caches and cache control instructions
* HW barrel shift / mul for performance
the list goes on.
There are lots of small, RISC CPUs out there - microblaze, nios, MIPS,
DLX, OpenRISC - unless you have good reason not to, aligning yourself to
one of these (or a subset) will make life much easier in the GCC and
Linux porting process.
Or, go the extreme approach and use URISC (Univeral / Ultimate RISC) -
only one instruction:
http://something.cust.viawest.net/courses/ee3651/purisc/program.html
Have fun,
John
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