Vijay, please make available the 2.6 code. Additionally, please
double check the major number you gave to mknod as bungling it would
quite likely yield the same problem you are seeing.
Greg
--- In "Vijay" <> wrote:
>
> 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" <osembedded@> 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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