×

Notice

The forum is in read only mode.
  1. Forum
  3. Development
  5. Development
  7. DFU optimization

DFU optimization

More
03 Feb 2018 08:11 - 05 Feb 2018 06:56 #67376 by vlad_vy
DFU optimization was created by vlad_vy
By the way, DFU optimization used for devo7e (and F series) can save about 4K MCU flash memory for other transmitters and 8K MCU flash memory for devo7e-256 series.
Last edit: 05 Feb 2018 06:56 by vlad_vy.
More
03 Feb 2018 09:56 #67378 by Fernandez
Replied by Fernandez on topic DFU optimization
Always good to be efficient....

FYI, in my devo U7E I soldered the 512k chip version (STM32F103RET6) (512kb Flash/64kb SRAM) it works fine and is full pin compatible it is not much more expensive, but I beleive the bootloader only adress and use 256k.
No idea what is in the jumpers and iranges......
More
05 Feb 2018 07:16 #67391 by vlad_vy
Replied by vlad_vy on topic DFU optimization
devo7e-256 without DFU optimization:

+ Building 'devo7e-256.elf'
ROM: 0x08003000 - 0x08038cac = 215.17kB
RAM: 0x20000000 - 0x200087e4 = 33.97kB


devo7e-256 with DFU optimization:

+ Building 'devo7e-256.elf'
+ Optimizing placement and re-linking
ROM: 0x08003000 - 0x08036dfc = 207.50kB
RAM: 0x20000000 - 0x200087e4 = 33.97kB
More
05 Feb 2018 07:51 #67392 by FDR
Replied by FDR on topic DFU optimization
Actually what do you mean on "DFU optimization"?
More
05 Feb 2018 08:20 #67393 by vlad_vy
Replied by vlad_vy on topic DFU optimization
For devo7e DFU optimized around the crc 'hole'. With other transmitters code placement started after crc 'hole' (CRC is located at 0x08005000).
ifdef OPTIMIZE_DFU
	$(CP) $(TARGET).elf objs/$(TARGET)/$(TARGET).elf
	@echo " + Optimizing placement and re-linking"
	$(SDIR)/../utils/repack_ld.pl -mapfile $(TARGET).map -size $(CRC_OFFSET) > objs/optimize.ld
	$(CC) -o $< $(OBJS) $(LIBOPENCM3) $(LFLAGS) $(LFLAGS2OPT) $(CFLAGS)
endif
More
05 Feb 2018 08:25 #67394 by FDR
Replied by FDR on topic DFU optimization
I thought the CRC in the DFU has a fixed position...
More
05 Feb 2018 08:30 - 05 Feb 2018 08:40 #67396 by vlad_vy
Replied by vlad_vy on topic DFU optimization
Yes. But without DFU optimization: vector table, zero bytes up to CRC, CRC (0x08005000), code. With DFU optimization: vector table, code, CRC (0x08005000), code.
Last edit: 05 Feb 2018 08:40 by vlad_vy.
  1. Forum
  3. Development
  5. Development
  7. DFU optimization
Time to create page: 0.063 seconds
Powered by Kunena Forum
Force desktop display