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vtaoe
n00b
Joined: 16 Aug 2002
Posts: 25
Location: Pensacola, FL, US
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 Posted: Tue Nov 25, 2003 1:11 am Post subject: /proc/openprom |
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I've got a recent install of Gentoo on my Ultra 5 (OBP 3.31.0), and I have noticed that my /proc/openprom is empty.
The openpromfs support was compiled as a module and appears to be loaded by default:
| Code: | # lsmod
Module Size Used by Not tainted
openpromfs 12528 0 (unused)
ide-cd 32976 0 (autoclean)
cdrom 28688 0 (autoclean) [ide-cd]
af_packet 13048 1 (autoclean)
rtc 1944 0 (autoclean)
unix 17952 100 (autoclean) |
Does it need to be compiled directly into the kernel, or is there something else I have to do to intereact with the NVRAM from inside Linux? I have seen another post here referring to creating a node in /dev/openprom, but without further explanation.
Issuing:
| Code: | # modprobe -c | grep openprom
alias char-major-10-139 openprom |
seems to indicate that it's expecting a character device node with major number 10 and minor number 139, so, poking around, I tried:
| Code: | | # mknod /dev/openprom c 10 139 |
but that didn't seem to change anything. Then, I tried:
| Code: | | # rmmod openpromfs && insmod openpromfs |
but no change. However, during all this, I accidentally typed insmod openprom and realized that there was a module by that name also. Curiously, enough, its insertion created a symlink /dev/openprom -> misc/openprom, and sure enough, /dev/misc/openprom is a character node with major number 10 and minor number 139. However, there's still no joy on getting anything from ls /proc/openprom.
Any suggestions? Thanks. |
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vtaoe
n00b
Joined: 16 Aug 2002
Posts: 25
Location: Pensacola, FL, US
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| Posted: Tue Nov 25, 2003 1:22 am Post subject: |
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Hey, look at that... Found my own answer again, this time in the help from the kernel option General Setup ---> Openprom tree appears in /proc/openprom:
| Code: | CONFIG_SUN_OPENPROMFS:
If you say Y, the OpenPROM device tree will be available as a virtual file system, which you can mount to /proc/openprom by "mount -t openpromfs none /proc/openprom". |
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