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66 Change UART status register to include recv buffer empty

This replaces bit 0 in the status register, previously used
for recv buffer _not_ empty, with a bit indicating if the
recv buffer _is_ empty.		 skordal 3181d 19h /.
65 Update platform headers and add cache control commands

Cache control is currently no-ops on Potato.		 skordal 3248d 02h /.
64 Add display enable support for the 7-seg module skordal 3248d 02h /.
63 Upgrade makefiles for use with the upgraded toolchain skordal 3251d 02h /.
62 Add a couple of missing signals to a sensitivity list skordal 3279d 03h /.
61 Add 7-segment display controller to the Potato SoC skordal 3280d 07h /.
60 Remove out-of-date comment skordal 3293d 23h /.
59 Remove branch: "new-privileged-isa" skordal 3314d 00h /.
58 Merge branch new-privileged-isa (r48-r57) into trunk

This adds support for the newly published supervisor extensions
version 1.7. In addition, a processor datasheet has been added
and the timer_clk signal has been properly connected in the
example design and the SoC testbench.		 skordal 3314d 03h /.
57 Add processor datasheet skordal 3314d 03h /.
56 Remove old and outdated processor manual skordal 3314d 04h /.
55 Use timer_clk for the example design and SoC testbench skordal 3314d 05h /.
54 Update benchmarks to work with supervisor spec v1.7 skordal 3318d 19h /.
53 Upgrade processor core to conform to the supervisor spec v1.7 skordal 3320d 20h /.
52 Correct .data section of sw-jal test skordal 3320d 20h /.
51 Add scall/ecall, sbreak/ebreak and timer interrupt tests skordal 3320d 20h /.
50 Update test environment to the new supervisor ISA skordal 3332d 21h /.
49 Correct spelling of "privileged" skordal 3342d 20h /.
48 Create branch for upgrading to the new privileged ISA skordal 3342d 20h /.
47 Tag version 0.1 of the Potato Processor skordal 3343d 04h /.

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