[ts-7000] TS7250 2.6 Kernel No such device or address (6)

["Vijay" <>]

Hi,
 I had previously created a graphic lcd driver module and a test
application to run on the TS7250 on the 2.4 Kernel. Now, I have
installed 2.6 Kernel after compiling it. I am using nfsroot to point
my root file system to my laptop.

 The board boots fine. I am able to insmod my 'ported' device driver
using insmod and I see a major number being allocated dynamically. I
then try to do lsmod and I am able to see the module in there. I used
mknod /dev/glcd0 c [MAJOR_NUM] 0 to create my device node. I am able
to see it in the /proc/devices as well.

 But when I run the test app that I had written for the 2.4 kernel
version, I was expecting the same system calls like open,close,ioctl
to work. But, for some reason, I cannot seem to open the device
located at /dev/glcd0. I get the following error message. 

Could not open /dev/glcd0: No such device or address (6)!

 See the following debug from "./strace display-test" [where
display-test is my test application which opens the device and tries
to perform some ioctl commands]

 Any help is appreciated! I have been trying to solve this for a week
now in vain... I know tmpfs is a virtual file system in RAM. But,
could this issue be related to me mouting my rootfs via nfs?

Thanks in Advance!
-Vijay

----- strace output [./strace display-test] -----

execve("/home/proj/base/app/display-test/display-test",
["/home/proj/base/app/display-test"...], [/* 14 vars */]) = 0
uname({sys="Linux", node="ts7800", ...}) = 0
brk(0)                                  = 0x14000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or
directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x2aac0000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=11247, ...}) = 0
mmap2(NULL, 11247, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aac1000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or
directory)
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0HO\1\0004"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1091040, ...}) = 0
mmap2(NULL, 1128068, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0x2aac9000
mprotect(0x2abd0000, 50820, PROT_NONE)  = 0
mmap2(0x2abd7000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x106) = 0x2abd7000
mmap2(0x2abda000, 9860, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2abda000
close(3)                                = 0
mprotect(0x2abd7000, 8192, PROT_READ)   = 0
mprotect(0x2aac7000, 4096, PROT_READ)   = 0
munmap(0x2aac1000, 11247)               = 0
fstat64(1, {st_mode=S_IFREG|0644, st_size=1463, ...}) = 0
mmap2(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x2abdd000
open("/dev/glcd0", O_RDWR)              = -1 ENXIO (No such device or
address)
write(1, "\nmain(+):\nopen_display(+):\nCould"..., 116
main(+):
open_display(+):
Could not open /dev/glcd0: No such device or address (6)!
main(): Could not Open display!) = 116
munmap(0x2abdd000, 32768)               = 0
exit_group(-1)                          = ?
Process 803 detached




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