CoolEagle

I am new commmer for linx wonderful world and I am learning "linux driver development".

an example called scull on the chapter 3, I was not able to successfully compile it. there are a lot of errors.

So i found answers from google. a guy said:"comment out the following content" in Rules.make

I did, cool, i can successfully compile Scull and Scull work well.

I just wonder:
1.Is there any risk by commenting out the following content?
2. why Scull can be successfuly compiled by commenting out the following content?


Thankyou very mcuh!

## We need the configuration file, for CONFIG_SMP and possibly other stuff
## (especiall for RISC platforms, where CFLAGS depends on the exact
## processor being used).
#ifeq ($(KERNELDIR)/.config,$(wildcard $(KERNELDIR))/.config)
# include $(KERNELDIR)/.config
#else
# MESSAGE := $(shell echo "WARNING: no .config file in $(KERNELDIR)")
#endif

coopstah13

This book was written around kernel 2.6.8, lots of things have changed since then and I imagine that is not the kernel you are running and trying to compile against.

CoolEagle

Yes, I was running it at Kernel2.4.20-8

coopstah13

2.4 kernel is even older, are you reading the 2nd or 3rd edition of the book? The 3rd edition is for kernel with 2.6, 2nd edition is for 2.4 kernel I think