[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Roc Wu]

Hi folks:

I found that the U-boot is not supporting the
Interrupt multiplexing. right? So I can't add an
interrupt handler for my specific device.

Is there any mechanism to inplement the same
function?Using polling method and make a fake
interrupt?


Thanks a lot
Best Regards 

Bryan Wu in China

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[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Wolfgang Denk]

In message <20040630061328.83297.qmail@web15205.mail.bjs.yahoo.com> you wrote:
> 
> I found that the U-boot is not supporting the
> Interrupt multiplexing. right? So I can't add an

What exactly do you mean by interrupt multiplexing?

> interrupt handler for my specific device.

Why not? What's wrong with using install_hdlr() / free_hdlr() ?

Having said this, I should  ask:  why  do  you  think  you  must  use
interrupts in the first place?

> Is there any mechanism to inplement the same
> function?Using polling method and make a fake
> interrupt?

Normally you don't need interrupts  in  U-Boot.  U-Boot  is  strictly
single-tasking  by  nature and design. So you can just use polling in
your device driver.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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Mensch mu? weiter suchen.                     - Christian Morgenstern

[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Roc Wu]

--- Wolfgang Denk <wd@denx.de> ????> In message
>
<20040630061328.83297.qmail@web15205.mail.bjs.yahoo.com>
> you wrote:
> > 
> > I found that the U-boot is not supporting the
> > Interrupt multiplexing. right? So I can't add an
> 
> What exactly do you mean by interrupt multiplexing?

Oh, It is mean u-boot providing an interrupt
management to manage lots of interrupts from the
device. Like linux kernel. So forgive me for asking
such unclearly question make you confused.

> > interrupt handler for my specific device.
> 
> Why not? What's wrong with using install_hdlr() /
> free_hdlr() ?
> 
> Having said this, I should  ask:  why  do  you 
> think  you  must  use
> interrupts in the first place?

Actually, I usually using interrupts for device
driver. As in u-boot, I am not realize interrupt is
not necessary.

> > Is there any mechanism to inplement the same
> > function?Using polling method and make a fake
> > interrupt?
> 
> Normally you don't need interrupts  in  U-Boot. 
> U-Boot  is  strictly
> single-tasking  by  nature and design. So you can
> just use polling in
> your device driver.

Ok, Thanks for you help. I will try to using the
polling method to inplement the device driver.


Best Regards.
Thanks a lot

Bryan Wu in China

P.S. I can't use my company's email to subscribe the
mailist. please check the address pwu at jadechip.com, is
it been blocked by the mailist system?



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[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Wolfgang Denk]

In message <20040630112705.43937.qmail@web15213.mail.bjs.yahoo.com> you wrote:
>
> > What exactly do you mean by interrupt multiplexing?
> 
> Oh, It is mean u-boot providing an interrupt
> management to manage lots of interrupts from the
> device. Like linux kernel. So forgive me for asking
> such unclearly question make you confused.

U-Boot is probably not the optimal environment to  process  "lots  of
interrupts".  If  you  need  to  do  more  complicated stuff, boot an
operating system. U-Boot is just a boot loader.

> Ok, Thanks for you help. I will try to using the
> polling method to inplement the device driver.

OK.

> P.S. I can't use my company's email to subscribe the
> mailist. please check the address pwu at jadechip.com, is
> it been blocked by the mailist system?

Maybe SourceForge is blocking it, I don't know. Ther eis  no  special
setup   in  the  mailing  list  configuration  itself  to  block  any
addresses. But SF is really fastidious with there requirements.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
We are drowning in information but starved for knowledge.
                                         -- John Naisbitt, Megatrends

[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Stephen Williams]

Roc Wu cooloney-at-yahoo.com.cn |u-boot-users| wrote:

> P.S. I can't use my company's email to subscribe the
> mailist. please check the address pwu at jadechip.com, is
> it been blocked by the mailist system?

It appears that jadechip.com is in China, using a chinese ISP for
mail service. A great many system administrators reject all mail
from chinese hosts as a spam prevention measure, as great oceans
of spam have historically come from China. Korea usually gets
similar treatment. I cannot say if that is what sourceforge.net
is doing, but it looks like it might be the case, and you are caught
up in the broad block.

I suggest you either (or both) take up this matter with your ISP,
or switch to an ISP outside China for e-mail service.
-- 
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."

[U-Boot-Users] How can I add an interrupt handler in the U-boot?

[Wolfgang Denk]

In message <40E2E626.4000209@icarus.com> you wrote:
> 
> It appears that jadechip.com is in China, using a chinese ISP for
> mail service. A great many system administrators reject all mail
> from chinese hosts as a spam prevention measure, as great oceans
> of spam have historically come from China. Korea usually gets
> similar treatment. I cannot say if that is what sourceforge.net
> is doing, but it looks like it might be the case, and you are caught
> up in the broad block.

I don't think that SF is blocking email on this level, and  at  least
they claim that they send bounces in case of rejects; but there is at
least  one  case of configuration problems where no such bounces seem
to be sent - when your ISP does not accept  bounce  messages  to  the
postmaster address.

To test:

	-> telnet mail.domain.tld smtp
	Trying AAA.BBB.CCC.DDD...
	Connected to mail.domain.tld (AAA.BBB.CCC.DDD).
	Escape character is '^]'.
	220 mail.domain.tld ESMTP
	HELO mail.denx.de
	250 mail.domain.tld
	MAIL FROM:<>
	250 ok
	RCPT TO:<postmaster@domain.tld>
	553 sorry, we do not accept bounces to <postmaster@domain.tld> (#5.7.1)
	QUIT
	221 mail.domain.tld
	Connection closed by foreign host.
	-> 

If you have such a situation, your messages will be rejected  by  SF,
and may or may not receive bounces.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
The use of COBOL cripples the mind; its teaching  should,  therefore,
be regarded as a criminal offence.
          -- Edsger W. Dijkstra, SIGPLAN Notices, Volume 17, Number 5