Booting time

Booting time

[JACK HWAN]

Hi.
 I ported linux-2.4.x to my motorola ppc8xx custom
board. And it works quite
well.
But the problem is booting time. It cosume too much
time than other embedded
OSes.
I disabled all options that I can. But it still slow.
 I took about 15~16 sec. the others are only takes
about 8 sec.
 How can I reduce the booting time?

Thanks in advance.

--

HoJin   <jhfami_at_yahoo.co.kr>


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Re: Booting time

[Eugene Surovegin]

On Mon, Feb 09, 2004 at 10:39:45AM +0900, JACK HWAN wrote:
>
> Hi.
>  I ported linux-2.4.x to my motorola ppc8xx custom
> board. And it works quite
> well.
> But the problem is booting time. It cosume too much
> time than other embedded
> OSes.
> I disabled all options that I can. But it still slow.
>  I took about 15~16 sec. the others are only takes
> about 8 sec.
>  How can I reduce the booting time?

Try turning off serial system console.

Eugene

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Re: Booting time

[Wolfgang Denk]

Hello,

in message <20040209013945.68409.qmail@web21506.mail.yahoo.com> you wrote:
>
>  I ported linux-2.4.x to my motorola ppc8xx custom
> board. And it works quite
> well.
> But the problem is booting time. It cosume too much
> time than other embedded
> OSes.
> I disabled all options that I can. But it still slow.
>  I took about 15~16 sec. the others are only takes
> about 8 sec.
>  How can I reduce the booting time?

Please provide a bit more  information  about  your  hardware  (which
processor  -  a  MPC850  with  it's tiny caches will be slower than a
MPC860P with the bigger ones; which CPU and  bus  clock  frequencies;
which memory bus width - 32 bit?).

Then define how you measure "boot time" - where  does  it  begin  (at
power  on?  when  your  boot  loader  starts loading the kernel? when
control is passed to the uncompressed Linux kernel?) and  where  does
it  end  (when  the  init  process  gets started? when the first user
application starts running?  when  you  entered  run  level  3  in  a
classical SysV init style system?).

For a "standard" system with 50 MHz CPU and 50 MHz bus  clock  I  can
demonstrate  that  it takes not more than 3...4 seconds from power on
until the first application process is running.

Best regards,

Wolfgang Denk

--
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
It is dangerous to be right on a subject  on  which  the  established
authorities are wrong.                                    -- Voltaire

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Re: Booting time

[Jaap-Jan Boor]

On Feb 9, 2004, at 2:44 PM, Wolfgang Denk wrote:
>
> For a "standard" system with 50 MHz CPU and 50 MHz bus  clock  I  can
> demonstrate  that  it takes not more than 3...4 seconds from power on
> until the first application process is running.

Wolfgang,

What kind of setup is that? A very small ramdisk or flash disk?
Does the (u-) boot loader do extensive ram tests?

thanks,

Jaap-Jan

>
> Best regards,
>
> Wolfgang Denk
>
> --
> See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
> It is dangerous to be right on a subject  on  which  the  established
> authorities are wrong.                                    -- Voltaire
>


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Re: Booting time

[Wolfgang Denk]

Dear Jaap-Jan,

in message <93314AB1-5B9D-11D8-B8DD-000A95B15278@aimsys.nl> you wrote:
>
> > For a "standard" system with 50 MHz CPU and 50 MHz bus  clock  I  can
> > demonstrate  that  it takes not more than 3...4 seconds from power on
> > until the first application process is running.
>
> What kind of setup is that? A very small ramdisk or flash disk?

This is with a standard setup; root filesystem size is in  the  range
of  5...10 MB. It works with a ramdisk (if not compressed), or with a
MTD based (non-compressing) filesystem. The  second  option  is  more
efficient regarding memory footprint in RAM.

A MTD mounted (read-only) ext2 filesystem in flash is pretty fast.

> Does the (u-) boot loader do extensive ram tests?

Just the basic tests which are also used to auto-size the RAM.

Best regards,

Wolfgang Denk

--
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
The only way to learn a new programming language is by  writing  pro-
grams in it.                                        - Brian Kernighan

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