[rtl] RE: IRQ not being seen

["Estabridis, Janet P" <EstabridisJP@navair.navy.mil>]

> -----Original Message-----
> From:	Estabridis, Janet P 
> Sent:	Thursday, December 16, 1999 5:51 AM
> To:	Estabridis, Janet P; 'rtl@rtlinux.cs.nmt.edu'
> Subject:	RE: IRQ not being seen
> 
> This hasn't gotten thru !
> 
> 	-----Original Message-----
> 	From:	Estabridis, Janet P 
> 	Sent:	Wednesday, December 15, 1999 1:17 PM
> 	To:	rtl@rtlinux.cs.nmt.edu
> 	Subject:	FW: IRQ not being seen
> 	Importance:	High
> 
> 
> 
> 	-----Original Message-----
> 	From:	Estabridis, Janet P 
> 	Sent:	Wednesday, December 15, 1999 10:46 AM
> 	To:	'RT Linux Group'
> 	Subject:	IRQ not being seen
> 	Importance:	High
> 
> 	Hi,
> 	I'm hoping that this is an easy one.
> 
> 	I have Kernel 2.0.36 rtlV1.1 
> 
> 	I have an AMPRO embedded CPU with a feature of having Serial 1 being
> configured to be RS485.  It is at address 0x38F IRQ 4.  It shared the IRQ
> with Serial 3.  I have disabled Serial 3 in the BIOS so that I should only
> have Serial 1 at IRQ 4.  
> 
> 	Now, I have gotten the RS485 to work in polled mode, but when I try
> to install and interrupt handler for IRQ 4 and initialize the UART 16C550
> to enable interrupts I never get to my ISR.  I have an application that I
> run and I can see that the Interrupt Ident Reg sees that an interrupt has
> happened and the Line Status Reg indicates that there is a byte there too.
> 
> 
> 	I have implemented the same rt task on the machine that is now
> sending the data.  It has an ISA RS485 card that responds to ISR 5 just
> fine.
> 
> 	Is there something magical about using ISRs that are reserved for
> motherboard functionality ?   
> 
> 	Thanks --
> 
> 	Janet Estabridis
> 	Electrical Engineer
> 	NAWC Code 473E00D
> 	Building 31440 Room 1017
> 	China Lake, CA 93555
> 	estabridisjp@navair.navy.mil
> 	(760) 939-2896  FAX (760) 939 -3075
> 
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