Re: separate kernel as code segment and data segment for linux ppc ?

In message [ref] you wrote:

As all know, the kernel is resided in flash rom, then upon power-on, kernel
is copied to RAM.
I wonder if I can just put data segment to ram and leave code segment to
FLASH, just as uClinux
has done. such method will save some ram space, which makes sense on
embedded solutions.

Does it really make sense? Flash is  more  expensive  than  RAM,  and
sometimes slower (especially if you have just a 8 or 16 bit wide boot
device). For all systems I've seen so far it was more efficient to be
able  to  store  a  compressed  image  in  flash, to reduce the flash
footprint on the expense of some RAM.

This has been discussed several times before on  this  mailing  list;
you might want to search the archives for all the other arguments pro
and contra.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
Man is the best computer we can put aboard a spacecraft ...  and  the
only one that can be mass produced with unskilled labor.
                                                  - Wernher von Braun

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