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46 Remove branch: cache-playground skordal 3446d 22h /potato
45 Merge branch cache-playground (r23-r30 and r34-r44) into trunk

This primarily adds the following features the the processor:
- A direct-mapped instruction cache with configurable cache line width and
number of cache lines.
- Various bug fixes for bugs that appeared when the processor could run
instructions at full speed but had to stall for data.
- A "Hello World" test application.		 skordal 3446d 22h /potato
44 Add instruction cache and use the WB adapter as dmem interface skordal 3446d 22h /potato
43 Improve instruction fetch logic skordal 3446d 22h /potato
42 Move check for stall from irq_asserted to exception_taken in EX stage skordal 3446d 22h /potato
41 Make continouous status register reads asynchronous skordal 3446d 22h /potato
40 Reduce example design clock frequency to 50 MHz

- Also includes a minor change to make the address decoder/interconnect work
better with burst transfers.		 skordal 3446d 22h /potato
39 Disable IRQs when handling exceptions skordal 3446d 23h /potato
38 Add "Hello World" test application skordal 3447d 00h /potato
37 Add macro to set the TOHOST register from C code skordal 3447d 00h /potato
36 Ensure correct read of CSR after stall skordal 3447d 00h /potato
35 Prevent jumping/branching when stalling skordal 3447d 00h /potato
34 Prevent flushing the pipeline if it is stalling skordal 3447d 00h /potato
33 Ensure correct read of CSR after stall skordal 3447d 00h /potato
32 Prevent jumping/branching when stalling skordal 3449d 21h /potato
31 Prevent flushing the pipeline if it is stalling skordal 3449d 22h /potato
30 Add testcase for a combination of instructions that fail when using cache skordal 3452d 03h /potato
29 Add reset functionality for the WB arbiter state machine skordal 3454d 22h /potato
28 Add rudimentary User's manual skordal 3460d 21h /potato
27 Prevent exceptions from being taken while stalling skordal 3460d 23h /potato

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