how to create a /dev file?!

[ronald_cn]

my cdrom is CD RW PIO 4 with IDE.but it can't be found at boot time.and how can i create it under dev directory?
i tried....see below
#mknod /dev/optcd0 b 17 0
#chmod 600 /dev/optcd0
#ln -s /dev/optcd0 /dev/cdrom
but the error message was
#mount /mnt/cdrom
-bash:/dev/cdrom is not a valid block device.
_________________
Secret is the public lie!

[pilla]

Are you using devfs? If you are, you probably forgot to compile the proper hardware support for your disk.
_________________
"I'm just very selective about the reality I choose to accept." -- Calvin

[phunkphorce]

I guess that if it can't be detected at boot time, it won't exist for the system, so there is no point in creating any /dev entry because

a) Even if you succeeded in creating the /dev entry manually, if the cd is not detected, it is as it was not there.

b) If you're using devfs, /dev entries are generated automatically and next time you boot, the one you created would be gone.

I'd suggest that you have a look at your kernel config. Most likely you forgot to include some important module or you chose the wrong one for your cd-rom, and check as well the output of the dmesg command to see what's the error given by the kernel.
_________________
O God, Thou art in Heaven...
...please stay there!

[ronald_cn]

i have read the Gentoo FAQ,and compilied DEVs in the kernel.and my cdrom is working.it has another name "hdc",and then i
#ln -s /dev/hdc /dev/cdrom
#mount /mnt/cdrom
its work!
_________________
Secret is the public lie!

[ronald_cn]

hehe...thank you very much!!!!
_________________
Secret is the public lie!

[phunkphorce]