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pru: Compile with -Os instead of -O2 

The gcc -Os option significantly reduces the size of the PRU binary
and it has little impact on performance.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-08-14 13:59:41 -04:00
parent 4b5109c1b9
commit 71bb7acb8e
2 changed files with 2 additions and 2 deletions
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2
docs/Features.md
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@ -86,7 +86,7 @@ represent total number of steps per second on the micro-controller.
| 20Mhz AVR | 189K | 125K |
| 16Mhz AVR | 151K | 100K |
| Arduino Due (ARM) | 382K | 337K |
| Beaglebone PRU | 689K | 689K |
| Beaglebone PRU | 680K | 680K |
On AVR platforms, the highest achievable step rate is with just one
stepper stepping. On the Due, the highest step rate is with two

2
src/pru/Makefile
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@ -6,7 +6,7 @@ CROSS_PREFIX=pru-
dirs-y += src/pru src/generic
dirs-y += lib/pru_rpmsg
CFLAGS += -minrt -mmcu=am335x.pru1
CFLAGS += -Os -minrt -mmcu=am335x.pru1
CFLAGS += -Ilib/pru_rpmsg/include -Ilib/pru_rpmsg/include/am335x
CFLAGS_klipper.elf := $(filter-out -mmcu=%, $(CFLAGS))