Re: [BLACKBOX] Seasoned Linux.

From: [at]} <Wojtek>
Date: Wed, 12 Jan 2011 19:07:33 -0500

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On Thu, 13 Jan 2011, Norayr Chilingarian wrote:

> c) in case of BlackBox - write several native backends for different CPU's

I just want to warn you that embedded CPUs are maybe a little different
from i386 because there are bugs in their silicon. For example, the
Blackfin BF533 is only supported by Analog Devices' ucLinux team from
silicon revision 0.3 and up. Two earlier silicon revisions were too buggy
for the ucLinux compiler team.

Those guys are embedded in the company's environment and thus they know
their silicon. It may be very labor-intensive to repeat their work based
on the data sheets and published silicon errata. From that point of view
it may be a safer approach to use the Oberon-to-C translation and then let
the gcc do the rest.

I know it sounds dirty. But it may prove unrealistic to develop and
maintain native backends.

I somehow feel it would be more realistic to define an Oberon-friendly
compatibility layer which would only depend on the Linux kernel
independent from the CPU. Then address all the work to that compatibility
layer using gcc. In such a way all the silicon dependencies will be
handled by the native teams at Analog Devices, Texas Instruments,
Freescale, etc. It is simply not possible to duplicate their work. They
have insider knowledge which outsiders are very unlikely to gain.


Wojtek

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Received on Thu Jan 13 2011 - 01:07:33 UTC