Serial

Serial

[Hyun-Joon Cha]

Hello.

I'm using 8xxrom-0.3.0 for boot loader and MVista-2.2.13 for kernel.
I tried to remove serial driver for some reason.

I have 4 questions abou it.

0. If I remove it, will board boot correctly?
1. Can I expect some performance gain with removal?
2. Are there any easy way to do it?
3. Where is most proper location for doing it? 8xxrom, m8xx_tty.c at mbxboot, or uart.c at 8xx_io?

Thanks in advance.

Have a nice day.

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Re: Serial

[Wolfgang Denk]

In message <051301c01160$d5e0b560$1952df8d@SOYANG> you wrote:
>
> I'm using 8xxrom-0.3.0 for boot loader and MVista-2.2.13 for kernel.

Forget 8xxrom. It's dead.

Use the new PPCBoot instead. See http://ppcboot.sourceforge.net/

> I tried to remove serial driver for some reason.

What are these reasons? Do you have  another  interface  to  interact
with the board instead?

> I have 4 questions abou it.

The following answers are for PPCBoot code.

> 0. If I remove it, will board boot correctly?

Yes, it will. But you will still have a lot of dead code (interactive
commands) which you might remove as well.

> 1. Can I expect some performance gain with removal?

What type of "performance" do you mean?

Linux will not run any faster when you remove the serial driver  from
the boot loader.

If you're talking about boot times, the difference is minimal  -  you
can    get   nearly   the   same   with   PPCBoot   configured   with
CONFIG_BOOTCOMMAND  set  to  the  command  you  need  to   boot   and
CONFIG_BOOTDELAY set to 0 so it will boot immediately.

> 2. Are there any easy way to do it?

Just remove the relevant code.

But to be  honest:  I  see  a  lot  of  disadvantages,  and  no  real
advantages.  But you didn't tell us your reasons, so I cannot comment
on this.

Hope this helps.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
A day without sunshine is like night.

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Re: Serial

[Graham Stoney]

Wolfgang Denk writes:
> > 1. Can I expect some performance gain with removal?
...
> Linux will not run any faster when you remove the serial driver  from
> the boot loader.

Well, it will boot quite a bit quicker.  If you have no serial port, or are
building a production system with no need for kernel messages, it's possible
to reduce boot time and kernel memory usage with my CONFIG_MESSAGES patch,
at:
    http://members.xoom.com/greyhams/linux/patches/2.2/messages.patch

Regards,
Graham
--
Graham Stoney
Principal Hardware/Software Engineer
Canon Information Systems Research Australia
Ph: +61 2 9805 2909  Fax: +61 2 9805 2929

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Serial

[Giuliano Pochini]

Does the "stealth" serial port for blue-G3 work with Linux ?


Bye.

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Re: Serial

[Dan Malek]

Giuliano Pochini wrote:
>
> Does the "stealth" serial port for blue-G3 work with Linux ?

I use them in my old iMac, new iMac (rev. D), iMac DV, and in my G4
server.  If the blue-G3 uses the same kind of modem as any of these,
and if the Stealth folks claim it will work in the G3, I would suspect
it works fine.  There is a challenge with the iMac DV, because they
don't make a card specifically for that machine.  I used a G4 version,
removed the header pins and soldered the cable directly to the board.
Tight fit, but it works.


	-- Dan

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Re: Serial

[Benjamin Herrenschmidt]

On Fri, Jun 16, 2000, Dan Malek <dan@netx4.com> wrote:

>> Does the "stealth" serial port for blue-G3 work with Linux ?
>
>I use them in my old iMac, new iMac (rev. D), iMac DV, and in my G4
>server.  If the blue-G3 uses the same kind of modem as any of these,
>and if the Stealth folks claim it will work in the G3, I would suspect
>it works fine.  There is a challenge with the iMac DV, because they
>don't make a card specifically for that machine.  I used a G4 version,
>removed the header pins and soldered the cable directly to the board.
>Tight fit, but it works.

I confirm, it works on the B&W G3, it's plugged on the good old SCCs of
the mac-io "coffee-machine"

Ben.


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