loadable modules

Hi adac,

The NiosII Linux distribution does support loadable modules. We use the insmod et al in busybox. The busybox application that is pre-built in the distribution does not have those applets enabled so you would need to re-build busybox. Unfortunately, due to an oversight, the busybox source code did not make v1.0. So, the options are:

1) i can re-build busybox for you with this support and pass you the executable

2) i can zip up the busybox source and pass that to you

3) v1.1 of the distribution will be released July 9th -- busybox source will be present

mike

Thanks for posting that.

It appears as though the modules stuff is broken, lsmod returns:

lsmod: QM_MODULES: Function not implemented

A quick google took me to the busybox mailing list where they said:

<div class='quotetop'>QUOTE </div>

--- Quote Start ---

> and my one cent. The QM_MODULES releated modutils are broken in

> 1.00-pre8: lsmod, insmod does not work at least for mips. 1.00-pre7 works

> fine. And I&#39;m also using uclibc. Have not figured out what exactly

> happens...

If it is the problem I&#39;m thinking of, it is due to the change in

libbb/module_syscalls.c and the fact that uClibc&#39;s syscall() function

is broken for number of args > 4 (?). There&#39;s a workaround in

current busybox cvs.[/b]

--- Quote End ---

Given that the version here is pre8 I&#39;m guessing this is the same problem, does it work for you there? Is there something I&#39;ve missed here?! (very possibly!)

Thanks.

Adrian

Hi,

Just disable the query_module (sub)feature of &#39;lsmod&#39; in the busybox configuration. Busybox supports several major kernel versions; for 2.6, the sys_query_module system call is no longer supported.

&#39;lsmod&#39; is essentially &#39;cat /proc/modules&#39;

mike

Humn. Tried that, had a drive nfs mounted on the PC and kept trying various options to try to get lsmod to work - pretty sure I tried the query modules option both on and off and it still gave the error.

Knew about /proc/modules anyway so that&#39;s not an issue, just wondered why lsmod itself didn&#39;t work.

Adrian

Hi,

A "make clean" might be necessary after you changed the configuration of busybox. As I observed, "lsmod" is not automatically rebuilt.

wentao

Thanks wentao, that was the problem! I just expected that a change to the configuration would cause a recompile, strangly enough something does get recompiled after a change - next time i&#39;ll inspect exactly what compiles rather than take it as doing what I expect.

Oh well, stage 1 complete now!

Adrian