On Mon, 13 Jun 2011, SADA SIVA REDDY S wrote:

Hi All,
?? I wanted to start my hands on on Linux kernel and got stuck at the beginning
with build failure. ( I have tried this few months back when it worked fine but
failing after upgrade.)
with following error:
Root device is (8, 6)
Setup is 14108 bytes (padded to 14336 bytes).
System is 4423 kB
CRC 4e90e12c
Kernel: arch/x86/boot/bzImage is ready? (#1)
? Building modules, stage 2.
? MODPOST 3274 modules
ERROR: "pm_idle" [arch/x86/kernel/apm.ko] undefined!
ERROR: "default_idle" [arch/x86/kernel/apm.ko] undefined!
WARNING: modpost: Found 30 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
ssreddy at N5030:~/linux-2.6$

I am looking to dedicate few hours every week from now.

I am refraining from attaching the .config file to wider list. I can send in
unicast if some one is willing to help me fix if there are problems in .config.

I have copied the old config file from installed ubuntu 11.04

yes ' ' | make oldconfig -- to generate my basic config file.

  two things.  first, it's not:

    yes ' '

  it's

    yes ''         [no space between the quotes]

that might be your problem.  also, at the risk of sounding
self-serving, i have an online kernel programming course here:

http://crashcourse.ca/introduction-linux-kernel-programming/introduction-linux-kernel-programming

for which the first several lessons are entirely free, and you're
welcome to work your way through them to see if they work for you.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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