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Update on my development to combine boards used by Prusa
Hi @DRracer @mkbel
I thought it might be more useful to open an issue instead adding comments to #1
So what happend

• I started another branch (may have to rename it later) https://github.com/3d-gussner/Arduino_Boards/tree/V1.0.2_merged_boards
  • pursa_mm_control and EinsyRambo boards are in one definition
  • bootloaders for both are included
    • @mkbel still don't know why there is a different avrdude.conf for the pursa_mm_control board
  • Still didn't get an answer why -P{serial.port} and "-P{serial.port}" are different in the platform.txt for MMU and Einsy?
  • EinsyRAMBo specific compiler.c.elf.extra_flags=-Wl,-u,vfprintf -lprintf_flt -lm are added to the boards.txt part and it seams to work fine. 1st tests where successful and debug log showed that these were used while compiling it in PF-build.sh as well in fresh Arduino IDE 1.8.5 portable versions ... tests with IDE 1.8.9 will come later
• Still struggle to get the avr6.xn patch into the definition but
  • as users using own Arduino IDE build environment are asked to change to primary language only in config.h it isn't needed here
  • If somebody whats to build their own multiple language versions they will not struggle to add the avr6.xn patch as they have to deal with the poorly documented language build.
  • and for PF-build.sh users we just patch it as it is now.

Can you have a look and give me some feedback?

There are 2 entries in Arduino Board Manager:
"Prusa research AVR Boards" and
"Prusa research AVR MK3/MK3S Einsy RAMBo"

Both point to my printer (MK3S). One has additionally the MMU upgrade with it, which I don't need, but the current version is higher (1.0.3) ..I don't want to bombard my printer with the wrong code, so I'm asking here:

As i3 MK3S user (without MMU), which of the two boards should I use? The newer version or the more fitting name?
And I ask (if you haven't already done so and I just didn't get it): Could you add an info so that no one need to ask again...