<p>hi,all<br> Here is a question I didn't make out, i wonder if anybody can figure it out. My platform is mpc8540 with graphics chip Fujitsu MB86296, my kernel version is <a href="http://2.6.12.6">2.6.12.6</a>. I'm about to write a gfxdriver so DirectFB can call this gfxdriver to make MB86296 do some drawing things. I wrote a program to test if the MB86296 drawing registers can be read and written. here is some part of the pragram:<br>
/* fbtest.c */<br>int fb; //descriptor of framebuffer device<br>unsigned long mmio; <br>fb = open("/dev/fb",O_RDWR); <br>mmio = (unsigned long *)mmap(0,0x2000000,PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);</p>
<p>unsigned long ntest=0x5f5f5f5f;<br>*( unsigned long *)(mmio+GDC_DRAW_BASE-GDC_HOST_BASE+GDC_REG_BACKGROUND_COLOR)=ntest; // set value in Background Color register with ntest<br>printf("*( unsigned long *)(mmio+GDC_DRAW_BASE-GDC_HOST_BASE+GDC_REG_BACKGROUND_COLOR)=%x\n",*(unsigned long *)(mmio+GDC_DRAW_BASE-GDC_HOST_BASE+GDC_REG_BACKGROUND_COLOR));<br>
msync((void *)mmio,0x2000000,MS_SYNC); </p>
<p>unsigned long ioctlReadRes[2];<br>ioctlReadRes[0]=GDC_REG_BACKGROUND_COLOR; //Background Color register offset address from drawing register bsae address<br>printf("ioctlReadRes = %x\n",ioctlReadRes);<br>ioctl(fb,FBIO_MB86290_READ_DRAW_REG,ioctlReadRes); // read what is in Background Color register,put it in ioctlReadRes[1]<br>
printf("ioctlReadRes[0]=%x,ioctlReadRes[1]=%x\n",ioctlReadRes[0],ioctlReadRes[1]);</p>
<p>Then I use debug tool strace to trace exe of this program,here is the result:</p>
<p>bash-3.00# strace ./fbtest<br>execve("./fbtest", ["./fbtest"], [/* 18 vars */]) = 0<br>uname({sys="Linux", node="super85xx", ...}) = 0<br>brk(0) = 0x10011000<br>
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =<br>0x30017000<br>access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or<br>directory)<br>open("/mnt/gtkdfb/lib/tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or<br>
directory)<br>stat64("/mnt/gtkdfb/lib/tls", 0x7fe46fb8) = -1 ENOENT (No such file or<br>directory)<br>open("/mnt/gtkdfb/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or<br>directory)<br>stat64("/mnt/gtkdfb/lib", {st_mode=S_IFDIR|0777, st_size=4096, ...}) = 0<br>
open("/etc/ld.so.cache", O_RDONLY) = 3<br>fstat64(3, {st_mode=S_IFREG|0644, st_size=12946, ...}) = 0<br>mmap(NULL, 12946, PROT_READ, MAP_PRIVATE, 3, 0) = 0x30018000<br>close(3) = 0<br>
open("/lib/tls/libc.so.6", O_RDONLY) = 3<br>read(3, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\0\1\307"..., 512) =<br>512<br>fstat64(3, {st_mode=S_IFREG|0777, st_size=1303116, ...}) = 0<br>mmap(0xfeab000, 1328676, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)<br>
= 0xfeab000<br>mprotect(0xffd8000, 95780, PROT_NONE) = 0<br>mmap(0xffe7000, 24576, PROT_READ|PROT_WRITE|PROT_EXEC,<br>MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12c000) = 0xffe7000<br>mmap(0xffed000, 9764, PROT_READ|PROT_WRITE|PROT_EXEC,<br>
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffed000<br>close(3) = 0<br>mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =<br>0x3001c000<br>mprotect(0xffe7000, 8192, PROT_READ) = 0<br>
mprotect(0x30026000, 4096, PROT_READ) = 0<br>munmap(0x30018000, 12946) = 0<br>open("/dev/fb", O_RDWR) = 3<br>mmap(NULL, 33554432, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0x30028000<br>
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(5, 1), ...}) = 0<br>ioctl(1, TCGETS or TCGETS, {B115200 opost isig icanon echo ...}) = 0<br>mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =<br>0x32028000<br>
write(1, "*( unsigned long *)(mmio+GDC_DRA"..., 74*( unsigned long<br>*)(mmio+GDC_DRAW_BASE+GDC_REG_BACKGROUND_COLOR)=5f5f5f5f<br>) = 74<br>msync(0x30028000, 33554432, MS_SYNC) = 0<br>write(1, "ioctlReadRes = 7fe47914\n", 24ioctlReadRes = 7fe47914<br>
) = 24<br>ioctl(3, 0x20004d2f, 0x7fe47914) = -1 EINVAL (Invalid argument)<br>write(1, "ioctlReadRes[0]=484,ioctlReadRes"...,<br>45ioctlReadRes[0]=484,ioctlReadRes[1]=30026f58<br>) = 45<br>munmap(0x32028000, 4096) = 0<br>
exit_group(45) = ?</p>
<p><br>from above, I think the problem is in ioctl call, which shows "EINVAL (Invalid argument)", so I added printk() to xx_ioctl() in fb driver, and it showed xx_ioctl() was not called .Then I checked xx_ioctl() was right. where is my problem? how to call ioctl() right??<br>
Thanks</p>