Uart(lite)/ELDK 4.1 section mismatch -> ML403

John Linn John.Linn at
Thu Mar 20 01:36:02 EST 2008

Hi Rob,


It sounds like your xparameters*.h with the #defines for the device
addresses is right for the uart as the bootstrap loader is working.


I don't believe early boot works was my experience with it.


What messages did you see in the __log_bug as this is the best tool, is
it booting all the way without a console or crashing during boot when it
tries to start the console?


Make sure the #define XPAR_DDR_0_SIZE 0x4000000 is in the
xparameters_ml403.h. It it's wrong the kernel will crash quickly based
on my experience.


Xilinx has a git server that I have been working on updating, not sure
how many changes there are in our git server as opposed to what you
have.  I have been testing arch/ppc with the ML405 which is the same as
the ML403 except a larger FPGA, but my testing has been with the 550
UART as the default.  I realize it's a tangent, but you can pull from
our server if you want as I know the state of it



John Linn



From: at
[ at] On
Behalf Of Rob Schalken
Sent: Wednesday, March 19, 2008 8:02 AM
To: linuxppc-embedded at
Subject: Uart(lite)/ELDK 4.1 section mismatch -> ML403


I want to Port the Linux to the ML403 board.  I tried some
different configurations:



After changing some defines and creating some symbolic link, the simple
boot loader seems to

Work. My kernel also starts because when I read the memory (using XMD),
I could read the _log_buf and

Some information was put in. I used the kernel command line:
console=ttyUL0 ip=off root=/dev/ram rw.  

But I did not get any kernel message on my serial console! When I
enabled the early boot text over

Serial port, the compiler gives some errors (gen550_init, RS_TABLE_SIZE,


**16550 Uart

After my disaster with the Uartlite, I started to use the 16550 uart.
But I immediately get the following


arch/ppc/boot/common/ns16550.c:22: error: 'RS_TABLE_SIZE' undeclared
here (not in a function)

arch/ppc/boot/common/ns16550.c:24: error: 'SERIAL_PORT_DFNS' undeclared
here (not in a function)

make[2]: *** [arch/ppc/boot/common/ns16550.o] Error 1

make[1]: *** [arch/ppc/boot/common] Error 2

make: *** [zImage] Error 2


I use ELDK 4.1 toolchain, which result in the following section mismatch

WARNING: vmlinux.o(.text+0x223c): Section mismatch: reference to
.init.text:earl y_init (between 'start_here' and 'initial_mmu')

WARNING: vmlinux.o(.text+0x2254): Section mismatch: reference to
.init.text:mach ine_init (between 'start_here' and 'initial_mmu')

WARNING: vmlinux.o(.text+0x2258): Section mismatch: reference to
.init.text:MMU_ init (between 'start_here' and 'initial_mmu')

WARNING: vmlinux.o(.text+0x22b2): Section mismatch: reference to
.init.text:star t_kernel (between 'start_here' and 'initial_mmu')

WARNING: vmlinux.o(.text+0x22b6): Section mismatch: reference to
.init.text:star t_kernel (between 'start_here' and 'initial_mmu')


By the way, the hardware is working, this has been tested!!


Could someone help to get a uart work! I only want to receive a message
from the kernel!!!! 



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