I have been getting 0700 exceptions while running Linux 2.4.20 on mature code on custom hardware. I discovered that if I call the disable dcache function after u-boot relocates to SDRAM the problem is corrected. Apparently the icache is getting corrupted. I don't understand why the dcache affects the icache. I have checked all of the SDRAM timing on a GHz occilascope and the waveforms are perfect. I have the ECC on and I can run an exhastive SDRAM test with the dcache on.
I was wondering if anyone has seen this problem or if I have a hardware problem?
I am currently working on turning on the L2 cache using the internal SRAM for benchmarking performance.
Regards, Carl J. Riechers
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