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From: segedy@cspi.UUCP (Cathy Segedy)
Newsgroups: comp.sys.hp
Subject: iomap functionality
Keywords: iomap, driver?, global variable, device with memory
Message-ID: <789@cspi.UUCP>
Date: 28 Sep 90 21:52:02 GMT
Organization: CSP Inc., Billerica, MA 01821
Lines: 19

Hello!
	I have a challenging question for everyone.  (If its not a challenge,
then you are the one who has the answer for me!)
	I have a device on an HP-9000, 300 series, VME bus.  It has memory
on it.  Following the rules of the game, it has a seperate device in /dev
to get at the memory.  This is a device with major number 10.  So, I
open the device, and I do an ioctl(fd,IOMAPMAP,&addr);
	If addr is 0, I get some memory which the iomap function inside the
driver has chosen to give me.
	If addr is an address outside of my program, I get some memory
back.
	However, if addr is the address of either a fortran common block or
a C global array, ie, inside my data space, I get a message about there not
being enough space to do the mapping.

	Can anyone help me out?
					thanks!  cathy segedy, CSPI
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