Hello:

I am working on a dummy device driver that used to be compiled with another kernel source (open source 2.6.14) but when I tried to compile a kernel module for it for the N800, the compilation breaks with the following errors.

Note: The problem seems to be originated when the driver includes

asm/memory.h

The errors are the following:

/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h: In function `virt_to_phys':
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:170: error: `CONFIG_DRAM_BASE' undeclared (first use in this function)
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:170: error: (Each undeclared identifier is reported only once
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:170: error: for each function it appears in.)
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h: In function `phys_to_virt':
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:175: error: `CONFIG_DRAM_BASE' undeclared (first use in this function)
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h: In function `virt_to_bus':
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:193: error: `CONFIG_DRAM_BASE' undeclared (first use in this function)
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h: In function `bus_to_virt':
/home/csanta/kernel-source-rx-34-2.6.18//include/asm/memory.h:198: error: `CONFIG_DRAM_BASE' undeclared (first use in this function)

Then, it keeps going and it finally outputs:

/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:33:3: #error You lose.
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if
/home/csanta/kernel-source-rx-34-2.6.18//include/linux/jiffies.h:210:31: division by zero in #if

Do you guys know why there are actually missing files in the kernel source?

What are the implications of using a slighlty different header file (in this case memory.h) from another directory, that be usr/include/ or even inside the compilers header file. If use the one in the compilers directory the errors go away, but I am afraid that my module will later on face further problems regarding memory mapping.

Please advice,

CS