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26 Prevent exceptions from being taken while stalling

Jumping to an exception handler while stalling and waiting for a load/store
instruction to finish can cause undefined results from the load/store
instruction. This actually fixes the issue mentioned in revision r20.
skordal 3290d 15h /potato/
25 Add placeholder cache modules and a wishbone arbiter skordal 3292d 19h /potato/
24 Remove unused STRINGIFY macros skordal 3293d 08h /potato/
23 Create branch to use for implementing a cache skordal 3293d 08h /potato/
22 Fix the potato_get_badvaddr() macro skordal 3293d 09h /potato/
21 Upgrade the example design to use a 60 MHz system clock skordal 3293d 09h /potato/
20 Fix SHA256 benchmark crash by storing all registers on exception handler entry

This problem will disappear when the processor is updated to conform to the
new supervisor specification, which will allow us to use a compiler that
conforms to the new "official" ABI.
skordal 3293d 09h /potato/
19 SHA256 benchmark: allow compiler to inline at will skordal 3293d 09h /potato/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3295d 09h /potato/
17 Improve detection of unaligned instructions skordal 3299d 16h /potato/
16 Correct grammar in source code comment skordal 3299d 16h /potato/
15 SHA256 benchmark: fix Makefile syntax error skordal 3306d 09h /potato/
14 Improve detection of invalid instructions skordal 3306d 10h /potato/
13 Add SHA256 benchmark code skordal 3306d 14h /potato/
12 Update example design with correct bug-report URL and testbenches skordal 3306d 16h /potato/
11 Correct FIFO file header skordal 3306d 17h /potato/
10 Add missing FIFO module skordal 3311d 11h /potato/
9 Remove dependency on a non-existent target in the Makefile skordal 3311d 11h /potato/
8 Clarify instruction ROM naming in the example design README skordal 3318d 13h /potato/
7 Add test design for the Nexys 4 board from Digilent skordal 3318d 13h /potato/

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