| hcfd | Hi. I'm trying to solve a problem with a multiport serial card. I had it working under latest Ubuntu 10.10, stock kernel but under 10.04LTS, latest kernel, I cannot get it configured and working properly. I am using kernel parameter 8250.nr_uarts=8 to allow me use of both onboard ports and the 6 on a PCI card. I tried to replicate my 10.10 setserial config under 10.04 and no joy at all. Could this be a kernel issue? | 01:15 |
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| hallyn | latest 2.6.38-3 kernel seems to not create good ad-hoc networks. booting 2.6.27-12 works. Gotta try a few more times to be sure it's the kernel, but so far it seems to be | 14:44 |
| hallyn | (that is separate from an apparent inability of the free broadcom brcm80211 driver to do ad-hoc, which is in itself unfortunate - is the b43 driver really meant to be blacklisted or was that my fault in the past?) | 15:05 |
| hyperair | probably your fault. it doesn't look like it's blacklisted on my system | 15:30 |
| hyperair | and i don't have a broadcom chip | 15:30 |
| ohsix | i'll just edit them in place, thankfully it's only a pin for firefox and aptitude so far; and i don't see having more than 8 or so ever | 17:12 |
| ohsix | that's it, moving this channel to its own window :D | 17:17 |
| kumaanki | hi everyone.. | 17:25 |
| kumaanki | which package contains the header files linux/init.h ? | 17:26 |
| mjg59 | The kernel source | 17:26 |
| mjg59 | Are you trying to build userspace or a kernel module? | 17:27 |
| kumaanki | i have downloaded the kernel source and now i was trying to build a single funsoft driver file.. | 17:27 |
| kumaanki | so how should i build it? | 17:29 |
| mjg59 | If you want to build it against your current kernel then you need linux-headers | 17:31 |
| mjg59 | Don't try to build it against unconfigured kernel source unless you're building your own kernel as well | 17:31 |
| kumaanki | can i not compile individual modules from kernel source..? | 17:32 |
| mjg59 | Not in any meaningful way | 17:33 |
| ohsix | copying the config for the running kernel and using the same compiler isn't enough? (i've never had it work the few times i tried, never looked into why) | 17:34 |
| kumaanki | hmm...ok. i mean say if some of the drivers are updated in upcoming kernels, will i have to re-install the whole kernel( i mean building the whole kernel itself?) | 17:34 |
| mjg59 | Typically, yes | 17:35 |
| mjg59 | Unless the driver has been backported to an older kernel | 17:35 |
| kumaanki | oh ok. | 17:36 |
| ohsix | mjg59: any idea why it doesn't work? need the deps in tree? it says symbols are missing, typically; even if you run depmod and use the same config | 17:37 |
| ohsix | is it because patches are missing or something, cuz i tried it out of the apt-get source tree once; didn't use the debian/* stuff to build it though | 17:38 |
| kumaanki | mjg59: even after installing the linux headers, the linux/init.h file is not found. | 17:40 |
| mjg59 | kumaanki: What, precisely, are you trying to do? | 17:41 |
| kumaanki | I am inside the kernel source dir ubuntu-maverick/drivers/usb | 17:41 |
| kumaanki | i am inside the kernel source directory ubuntu-maverick/drivers/usb | 17:42 |
| mjg59 | That's not going to work | 17:42 |
| kumaanki | why..? | 17:42 |
| mjg59 | Because the build system doesn't work that way | 17:42 |
| kumaanki | but it should be able to build it if the linux headers are present | 17:43 |
| mjg59 | To a first approximation, you can't build drivers from different kernel versions | 17:43 |
| kumaanki | the funsoft.c file does not demand anything else than linux headers from the current kernel | 17:43 |
| kumaanki | the source code is for the same kernel version | 17:44 |
| mjg59 | So why isn't it included already? | 17:44 |
| kumaanki | the kernel headers might not be part of standard installation i guess | 17:45 |
| ohsix | i think he means the funsoft module | 17:45 |
| ohsix | ie. why do you need to build it yourself | 17:46 |
| kumaanki | ohsix: yes. | 17:46 |
| kumaanki | was trying to learn how the driver code builds and compiles and the code for funsoft seems understandable so thought of compiling it | 17:47 |
| ohsix | ah | 17:47 |
| ohsix | well it's not straight forward if you don't start with your own kernel already | 17:47 |
| mjg59 | You can't just gcc a kernel module | 17:47 |
| mjg59 | You need to use the kernel buildsystem | 17:47 |
| mjg59 | So, from the top of the kernel source tree, you can do make drivers/usb/serial/funsoft.ko | 17:48 |
| mjg59 | And that will build the kernel module against the configuration of the source tree | 17:48 |
| kumaanki | oh, let me try this then.. ) | 17:48 |
| mjg59 | Which may not match the configuration of the kernel you're running | 17:48 |
| mjg59 | So you may end up with a module you can't load | 17:48 |
| kumaanki | ok. i want to try my hands on kernel code. | 17:51 |
| ohsix | you might want to play with qemu and your own kernel tree :D it can run images directly, and it's a virtual machine; less disruptive | 17:53 |
| kumaanki | cool. i am able to build the .ko file now. but the insmod on the generated funsoft.ko fails. probably that's because of the mismatch in kernel versions | 17:53 |
| mjg59 | dmesg will tell you what the failure is | 17:54 |
| mjg59 | If you want to build against a kernel with a longer version string, then you'll need to do something like make EXTRAVERSION=-2-686 drivers/usb/serial/funsoft.ko | 17:54 |
| kumaanki | dmesg does not log any messages pertaining to the error in insmod | 17:55 |
| kumaanki | i checked the output of dmesg | 17:55 |
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