Re: [uCsimm] a fool question

From: Tom Walsh (tom@cyberiansoftware.com)
Date: Sat Dec 23 2000 - 06:36:31 EST


"Florian G. Pflug" wrote:
>
> On Wed, Dec 20, 2000 at 09:13:15PM -0500, Tom Walsh wrote:
> > "Paredes, Jefferson SECUADO-FNE4" wrote:
> > >
> > > Is possible port uClinux to 16 bit microcontroller.? maybe Hitachi H8S?,
> > > what is the minimun system? how much minimun RAM, ROM is needed?
> > >
> >
> > In theory, it would be possible, but I don't think that you want to go
> > thru the work that you would have to do rewriting the entire code base!
> > In practical terms the answer may be no, the kernel image (with a rom
> > filesystem) is approx 800K, with about 430K being the kernel itself.
> But as far as I remember, the 8086 could address more than 64kBytes of Ram,
> although the Rest of the Processor was 16-Bit...
>
> On an Platform where the Address-Bus is also limited to 16 Bits, meaning
> only 64KBytes of Ram (without using _really_ dirty Tricks as the Apple ][
> did). This seems to be too little memory for uClinux - even _if_ you somehow
> get the kernel into those 64KBytes, there will we no space left for
> userspace apps, a rom-fs image,....).
>
> Maybe you would be better of if you just take the things you would need from
> uClinux (like maybe the TCP-Stack, .....) and put the together in one
> monolithic programm).
>
> Greetings, Florian Pflug
> This message resent by the ucsimm@uclinux.com list server http://www.uClinux.com/

8086 had a 20 bit address range.

TomW

-- 
Tom Walsh - WN3L - Embedded Systems Consultant
'www.openhardware.net', 'www.cyberiansoftware.com'
"Windows? No thanks, I have work to do..."
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