I've gone through the following steps in order to create a 
pseudo-device driver and now I'm stuck.  If any one has any ideas, I 
would appreciate hearing them....

The driver is called testdata and is based on the test data 
pseudo-driver from "Writing Unix Device Drivers" by George Pajari.


Step 1)  Modified /sys/conf/files to add the following two lines:

pseudo-device td

file dev/testdata.c		td


Step 2)  Modified /sys/arch/sparc/conf/{my_machine} to add the 
following line:
pseudo-device	td

Step 3)  Ran config {my_machine} in the /sys/arch/sparc/conf 
directory

Step 4)  Added the following lines to the appropriate places in 
/sys/arch/sparc/sparc/conf.c:

#include "td.h"

cdev_td_init(NTD,td),		/* 122: test data pseudo-device */

Step 5)  Added the following line to /sys/sys/conf.h:

#define cdev_td_init(c,n)       cdev__ocrwip_init(c,n)


Step 6)  Created /sys/arch/sparc/compile/{my_machine}/td.h which 
contains the following line:

#define NTD	0

Step 7)  Created a symlink from {my_directory}/testdata.c to 
/sys/dev/testdata.c

Step 8)  Changed to the /sys/arch/sparc/compile/{my_machine} 
directory and ran make >& make.log


Step 9)  Failed at figuring out where I went wrong.

root@hw-ss1# more make.log
cc -g -O2 -Werror -Wall -Wstrict-prototypes -Wmissing-prototypes 
 -Wpointer-arith -Wno-main -mno-fpu -I. -I.
./../../../arch -I../../../.. -nostdinc -DSUN4C -DRASTERCONSOLE -DLKM 
-DDIAGNOSTIC -DDEBUG -DMAXUSERS=32 -D_
KERNEL  -c ../../../../arch/sparc/sparc/conf.c
../../../../arch/sparc/sparc/conf.c:254: `tdopen' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_open' is not constant
../../../../arch/sparc/sparc/conf.c:254: `tdclose' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_close' is not constant
../../../../arch/sparc/sparc/conf.c:254: `tdread' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_read' is not constant
../../../../arch/sparc/sparc/conf.c:254: `tdwrite' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_write' is not constant
../../../../arch/sparc/sparc/conf.c:254: `tdioctl' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_ioctl' is not constant
../../../../arch/sparc/sparc/conf.c:254: `tdpoll' undeclared here 
(not in a function)
../../../../arch/sparc/sparc/conf.c:254: initializer element for 
`cdevsw[122].d_poll' is not constant
*** Error code 1

Stop.


The source code to this "driver" is available if anyone wants it. 
 This whole exercise is a pre-cursor to doing a real simplistic 
driver to talk to a network board.



=======================================================
Steven Grunza				Hardware Engineer
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