Hi,
Thanks for your reply! I am new to creating loadable kernel modules, so
I hope you do not mind some more questions... How can I get the XIo_*
helper routines to compile into the kernel or export them with
EXPORT_SYMBOL( )? In my c file (my driver file from which I create the
object file), I made sure to include xio.h, which is where XIo_In32 and
XIo_Out32 are defined (see below section from xio.h).
/************************** Function Prototypes
******************************/
/* The following functions allow the software to be transportable across
* processors which may use memory mapped I/O or I/O which is mapped into a
* seperate address space such as X86. The functions are better suited for
* debugging and are therefore the default implementation. Macros can
instead
* be used if USE_IO_MACROS is defined.
*/
#ifndef USE_IO_MACROS
/* Functions */
u8 XIo_In8(XIo_Address InAddress);
u16 XIo_In16(XIo_Address InAddress);
u32 XIo_In32(XIo_Address InAddress);
void XIo_Out8(XIo_Address OutAddress, u8 Value);
void XIo_Out16(XIo_Address OutAddress, u16 Value);
void XIo_Out32(XIo_Address OutAddress, u32 Value);
#else
/* The following macros allow optimized I/O operations for memory mapped I/O
* Note that the SYNCHRONIZE_IO may be moved by the compiler during
* optimization.
*/
#define XIo_In8(InputPtr) (*(volatile u8 *)(InputPtr)); SYNCHRONIZE_IO;
#define XIo_In16(InputPtr) (*(volatile u16 *)(InputPtr)); SYNCHRONIZE_IO;
#define XIo_In32(InputPtr) (*(volatile u32 *)(InputPtr)); SYNCHRONIZE_IO;
#define XIo_Out8(OutputPtr, Value) \
{ (*(volatile u8 *)(OutputPtr) = Value); SYNCHRONIZE_IO; }
#define XIo_Out16(OutputPtr, Value) \
{ (*(volatile u16 *)(OutputPtr) = Value); SYNCHRONIZE_IO; }
#define XIo_Out32(OutputPtr, Value) \
{ (*(volatile u32 *)(OutputPtr) = Value); SYNCHRONIZE_IO; }
#endif
I thought that, by including xio.h, XIo_In32 and XIo_Out32 would be
taken care of, but that is probably a novice assumption of mine...
-Juliana
Grant Likely wrote:
On Fri, Jul 11, 2008 at 10:26:27AM -0400, Juliana Su wrote:
Hi,
Is anybody familiar with the following error?
insmod: unresolved symbol XIo_In32
insmod: unresolved symbol XIo_Out32
I am trying to write a device driver for a Custom IP and get it to run
on a Xilinx ML310's Linux OS. I am using Xilinx EDK 10.1 and MontaVista
Linux version 2.4.20_mvl31-ml300. I ran into this error when trying to
load my module into the kernel. When I try to load the module using
insmod on the ".o" file, the module refuses to load and gives me the
unresolved symbol error message. I actually stumbled upon an older
posting from June 2006 on this mailing list that described a similar
problem, but those suggestions did not help me. Maybe two years later,
there are more ideas/suggestions/solutions to this problem?
I can't help much with the 2.4 montavista kernel, but I can say that the
error means that the XIo_* helper routines are either not compiled into
the kernel or are not exported with EXPORT_SYMBOL(). The XIo_* routines
are hooks used by Xilinx cross platform device drivers to make the
actual accesses to hardware. If they are not implemented, then you need
to create them yourself.
g.
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