Help needed to solve SCSI problem

Help needed to solve SCSI problem

[Thomas Bogendoerfer]

I'm now total stuck with the remaining SCSI problem, and need some help.

I have a really broken cdrom drive. With this cdrom I'm able produce a
scsi timeout, which will cause a hang of the complete machine. I've
traced the problem a little bit further, and detected, that I get
interrupts on interrupt vector 0 (it's named VECTOR_GIO0 in the Irix
header files). I always see 17 irq 0 then the machine hangs completly.

Please, could someone tell what this interrupt means, so I can either
solve it by servicing the interrupt the right way or avoid it by doing 
something else ?

Thomas.

-- 
   This device has completely bogus header. Compaq scores again :-|
It's a host bridge, but it should be called ghost bridge instead ;^)
                                        [Martin `MJ' Mares on linux-kernel]

Re: Help needed to solve SCSI problem

[William J. Earl]

Thomas Bogendoerfer writes:
 > I'm now total stuck with the remaining SCSI problem, and need some help.
 > 
 > I have a really broken cdrom drive. With this cdrom I'm able produce a
 > scsi timeout, which will cause a hang of the complete machine. I've
 > traced the problem a little bit further, and detected, that I get
 > interrupts on interrupt vector 0 (it's named VECTOR_GIO0 in the Irix
 > header files). I always see 17 irq 0 then the machine hangs completly.
 > 
 > Please, could someone tell what this interrupt means, so I can either
 > solve it by servicing the interrupt the right way or avoid it by doing 
 > something else ?

      I believe that is the two bits:

#define EXTIO_HPC3_BUSERR		0x0010
#define EXTIO_SG_STAT_0			0x0001

HPC3_BUSERR means that the HPC3 got a bus error reading from memory.
The driver is probably broken and giving bad commands to the HPC3.
You should be able to find the error address in the GIO_ERR_ADDR register:

#define	GIO_ERR_ADDR	0x1fa000f4	/* GIO error address (w, ro) */

(0xbfa000f4 as a K1SEG address).

Re: Help needed to solve SCSI problem

[Thomas Bogendoerfer]

On Fri, Mar 26, 1999 at 03:49:32PM -0800, William J. Earl wrote:
> #define EXTIO_HPC3_BUSERR		0x0010
> #define EXTIO_SG_STAT_0			0x0001

ahh, another register I didn't know.

> HPC3_BUSERR means that the HPC3 got a bus error reading from memory.
> The driver is probably broken and giving bad commands to the HPC3.
> You should be able to find the error address in the GIO_ERR_ADDR register:

I've checked the MC registers cstat, gstat, the HPC3 registers intstat, 
instat.bug, bus error and the extio register. All of them are zero. Any 
other idea ?

Thomas.

-- 
   This device has completely bogus header. Compaq scores again :-|
It's a host bridge, but it should be called ghost bridge instead ;^)
                                        [Martin `MJ' Mares on linux-kernel]