RS/6000 Device Driver Problems.

[Andre Scheunemann]

Help needed with RS/6000 AIX 3.1 device driver.


I am writing a device driver for a micro-channel card for the RS/6000 with
AIX 3.1.  I'm using the BUSIO_ATT() and BUSMEM_ATT() macros from
<sys/adspace.h> to access the card I/O ports and card memory respectively.
There are no problems accessing the I/O ports.  However, when I try to access
the card memory the system crashes with a 102 320 led error code.
The following code is used:

{
    ulong io_addr, mem_addr;

    io_addr = BUSIO_ATT(bus_id, card_io_addr);
    mem_addr = BUSMEM_ATT(bus_id, card_mem_addr);

    data = BUSIO_GETC(io_addr);		/* this works and causes a read */
					/* of the I/O register */

    data = BUSIO_GETC(mem_addr);	/* this causes a system crash !!!!! */

    BUSIO_DET(io_addr);
    BUSMEM_DET(mem_addr);
}

The BUSIO_GETC() is a macro from <sys/ioacc.h>.  The same code is used in the
sample device drivers provided in the /usr/lpp/bos/samples directory.

I know that the card memory can be accessed because I can access it using
ioctl's on the /dev/bus0 device.

Can anyone tell me what I'm doing wrong?


Thanks in advance,

andre%eicon at iro.umontreal.ca