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Make space for e51 dhrystone
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Dhrystone arty
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Implement a smaller puts
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The e31's init.c calls puts intsead of printf, which oddly enough is a
lot bigger: since we wrap printf, puts pulls in a lot of newlib. This
adds a wrapped puts so it's very small.
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Speed up Dhrystone on the HiFive1
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There's a handful of things that went wrong here:
* The read-only data sections were mapped to flash, which is very slow.
I just put them in the data segment, so they end up in the scratchpad.
This is about a 10x hit, so it's really important.
* The toolchain was an old version, which didn't have a fast memcpy
implementation on 32-bit systems. This is about a 2x hit.
* Some compiler flags were incorrect, including
* -Os instead of -O3
* Missing -mexplicit-relocs
* Missing -DNOENUM
* Missing -falign-functions=4
I haven't checked how much those hurt
With this, I get
$ make software BOARD=freedom-e300-hifive1 PROGRAM=dhrystone LINK_TARGET=dhrystone
$ make upload BOARD=freedom-e300-hifive1 PROGRAM=dhrystone LINK_TARGET=dhrystone
Execution starts, 10000000 runs through Dhrystone
Execution ends
Final values of the variables used in the benchmark:
Int_Glob: 5
should be: 5
Bool_Glob: 1
should be: 1
Ch_1_Glob: A
should be: A
Ch_2_Glob: B
should be: B
Arr_1_Glob[8]: 7
should be: 7
Arr_2_Glob[8][7]: 10000010
should be: Number_Of_Runs + 10
Ptr_Glob->
Ptr_Comp: -2147470264
should be: (implementation-dependent)
Discr: 0
should be: 0
Enum_Comp: 2
should be: 2
Int_Comp: 17
should be: 17
Str_Comp: DHRYSTONE PROGRAM, SOME STRING
should be: DHRYSTONE PROGRAM, SOME STRING
Next_Ptr_Glob->
Ptr_Comp: -2147470264
should be: (implementation-dependent), same as above
Discr: 0
should be: 0
Enum_Comp: 1
should be: 1
Int_Comp: 18
should be: 18
Str_Comp: DHRYSTONE PROGRAM, SOME STRING
should be: DHRYSTONE PROGRAM, SOME STRING
Int_1_Loc: 5
should be: 5
Int_2_Loc: 13
should be: 13
Int_3_Loc: 7
should be: 7
Enum_Loc: 1
should be: 1
Str_1_Loc: DHRYSTONE PROGRAM, 1'ST STRING
should be: DHRYSTONE PROGRAM, 1'ST STRING
Str_2_Loc: DHRYSTONE PROGRAM, 2'ND STRING
should be: DHRYSTONE PROGRAM, 2'ND STRING
Microseconds for one run through Dhrystone: 1.3
Dhrystones per Second: 714285.6
which is 1.55 DMIPS/MHz at 262 MHz. It's still a bit slower than our
current stuff, but I don't remember what was actually in the HiFive1 so
I'm not sure what we should be getting. I verified the clock is
accurate with a stopwatch. I haven't bothered to go look through the
binary, but I think we're about 10 cycles off so it should be managable.
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Update Makefile with more user-friendly clean options
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added ecall to vectored irq example
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Vector
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registers
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1) Change target 'clean' to refer to 'software_clean' rather than 'toolchain-clean' and 'openocd-clean'.
2) Update Makefile help to reflect changes.
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Add support for multicore systems and scratchpad-only systems
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This just prints "hello world" on two cores. It contains an example of
how to initialize a multi-core system using IPIs, and a simple spin
lock.
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printf doesn't fit in the scratchpad, but since there's really no reason
to call it on constant strings it can be replaced with puts. With this
change, the "hello" example fits in the scratchpad.
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