Clint,

check the interrupt sub-system of your design. What you describe 
typically happens when the PPC does not get any interrupts from the 
UART. It's most likely a mismatch between your hardware and the 
xparameters.h.

- Peter


Clint Thomas wrote:

Hey guys,

I've run through the loops to try and figure what could be wrong with 
this system. The board in question is modeled after the Xilinx ML300 
board. It uses a Xilinx System ACE chip to load a FPGA / Kernel image 
from compact flash. Originally, I was trying to use the CompactFlash 
as the root file system, but because of issues in either the design or 
software, this would only work if SysAce was in polled I/O mode. To 
circumvent this, I built my root filesystem into an initrd image and 
built a single ELF file with the Kernel and RFS, then strapped that to 
the FPGA bit file to make a single FPGA/Kernel/RFS SysAce file.

Upon decompression, the Linux kernel boots quickly and loads all of 
the device drivers. However when it gets to the prompt, it starts 
slowing down. Output and input to and from the board becomes very very 
slow (it displays 2 characters roughly every 20 seconds). Originally I 
believed this to be the CPU still polling SystemAce, so I disabled the 
Linux System ACE drivers to remove that as a possibility, however 
after doing this, the problem still persists, even with the RFS in 
ram! Has anybody encountered a similar situation to this before, with 
possible insight towards a solution? Thank you for your time.
 
Clinton Thomas
cthomas@soneticom.com
 

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