Guys,
Could any of you help me with the following? I am creating a very
basic 'hello world' driver module and a test app to make sure I am not
doing anything fundamentally wrong. But, if you guys have experienced
this issue before, please shed some light on it.
Thanks,
-Vijay
--- In "Vijay" <> wrote:
>
> 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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