--- David Woodhouse wrote: > >zeusj@firstlinux.net said: >> Can you tell me why only my mtd char device with even minor deivce >> number works? and there is no such thing happened on my mtd block >> device. > >Did you run the MAKEDEV script or try to make your devices by hand? If you >did them by hand, did you do so without referring to Documentation/devices.txt? > >grep -A6 " 90 char" /usr/src/linux/Documentation/devices.txt Thanks, I have checked the devices.txt, so I got why the odd mtd "permission denied". But if the device nodes with major 31 ,mi 0-7 are ROM card (as the device.txt said),why my flash can works without nothing wrong? I think the minor number should be 8-15 , isnt it? one more question when I use jffs as the root filesystem, everything is ok, but when I use jffs2 (I remeber that you said its more stable than jffs:), I got a problem some message appears on my screen and the root filesystem is readonly (this never happened on jffs), the following is the message: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000e0014: 0x552f in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000e0018: 0x175e in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000e001c: 0xcdf6 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000e0020: 0xb7fb in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000e0024: 0x7615 in stead Further such events for this erase block will not be printed VFS: Mounted root (jffs2 filesystem) readonly. Freeing init memory: 40K serial console detected. Disabling virtual terminals. init started: BusyBox v0.60.2 (2002.02.24-07:14+0000) multi-call mount: Mounting /dev/ram0 on / failed: No such device or address mount: Mounting devpts on /dev/pts failed: Nh BusyBox v0.60.2 (2002.02.24-07:25+0000) Built-in shell (msh) Ee o-a Processing /etc/profile... Done # Thank you very much! Jim Zeus _____________________________________________________________ Want a new web-based email account ? ---> http://www.firstlinux.net _____________________________________________________________ Run a small business? Then you need professional email like you@yourbiz.com from Everyone.net http://www.everyone.net?tag