From mboxrd@z Thu Jan  1 00:00:00 1970
From: prathika <prathika@deeopl.com>
Date: Thu, 09 Apr 2009 11:52:02 +0530
Subject: [U-Boot] Interrupt handlers in u-boot
In-Reply-To: <200904081442.01543.sr@denx.de>
References: <49DC8432.8050306@deeopl.com> <200904081442.01543.sr@denx.de>
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To: u-boot@lists.denx.de

hi all,
i got the interrupt handler working for SPI Receive in PPC 440 using 
install_hdlr().
Now i am trying to enable the External IRQ0 in my stand alone 
application. I am trying to detect the positive of the interrupt pulse, 
so i wrote corresponding bit to the UIC0_PR  and UIC0_EN register and 
also calling the install_hdlr().
but still it detects the zero state at the IRQ0 pin and always executes 
the interrupt handler.
when i read back the DCRs UIC0 enable and polarity registers using my 
application, the control word is fine.
but when i read using uboot commands getdcr in command window, the 
status of both enable and polarity registers are not enabled for IRQ0.
when i try to set the corresponding bit for IRQ0 using setdcr, it gives 
me message, "Masking bogus interrupt for 0x17"
where am i going wrong.Some one please help.
Thanks in advance.

Thanks & Regards,
Prathika R.

Stefan Roese wrote:
> On Wednesday 08 April 2009, prathika wrote:
>> I am working on u-boot 1.1.6 version for PowerPC 440.
> 
> First of all. v1.1.6 is really old. I suggest that you use the current 
> (latest) version instead.
> 
>> I am using the 
>> hello world application from the examples folder.
>> I had no issues in loading and executing it.
>> Now I have enabled SPI interrupt in the application. I have written for
>> SPI loopback.
>> My issue is, as there is no interrupt handler defined for the SPI in
>> uboot, whenever i execute my application,
>> it says "Masking bogus interrupt for Vector 0x08". I am calling
>> "install_irq_handler" function for assigning my own interrupt handler
>> for SPI as part of my application itself.
>> I can understand that, there is no exclusive handler for SPI in uboot,
>> so it is disabling the SPI interrupt and printing the BOGUS INTERRUPT
>> message.
>> Now how do I get rid of this and have my own interrupt handler??
> 
> You just need to install you "own" interrupt handler. This is done via 
> install_hdlr(). See examples/interrupt.c.
> 
> Best regards,
> Stefan
> 
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