[microblaze-uclinux] System hangs with I-cache enabled

[Alex Krasnov <akrasnov@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I have built the uclinux kernel from the latest source and am running it 
on the XUP board using the reference design with caches enabled. Whenever 
I enable the I-cache in the kernel, the system hangs after a short period 
(at most a few minutes). In particular, an almost certain way to hang it 
is to do an NFS transfer, though the problem occurs even with NFS 
disabled. XMD reports that the pipeline is stalled at a random PC. The 
problem occurs consistently regardless of other hardware or kernel features.

Before I go on a lengthy debugging journey, I would like to know whether 
this is a known problem or whether there is a simple explanation. The only 
possible explanation I see is that the I-cache is inconsistent with main 
memory; however, this seems unlikely since the kernel flushes the I-cache 
when necessary. Also, I added full flushes in several places, including in 
the scheduler. Adding printfs to the scheduler seemed to help, so perhaps 
there is a race condition. I can provide additional information or debug 
output if necessary.

Thanks,
Alex
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