If you want to run Grbl at 115200 baud instead of the default 9600, you need to build from source.
Grab the source;
git clone https://github.com/grbl/grbl
Edit the file config.h, then search for BAUD_RATE and change the value from 9600 to 115200 and save.
From this site: http://dank.bengler.no/-/page/show/5471_gettinggrbl?ref=checkpoint
it sent me to download WinAVR, which allows me to build code for the Atmel processor http://winavr.sourceforge.net/
I had some trouble getting the installer to finish, but once done, open a command window to the grbl folder that you created via git and type
make
All the code should compile pretty quickly and you’ll have a hex file
grbl.hex
Use ArduinoUploader to upload to your Arduino and use Grbl Controller 3.4 to verify that you can run with the new baud.
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When I use XLoader to upload Grbl it seems to freeze up when set at 9600. The only way that it completes the process is if it is set at 115200. When I get everything connected nothing happens. . . Any ideas or advice?
Arduino Uno R3 (Atmega328p)
XLoader
grbl_vo_8c_atmega328p_16mhz_9600.hex
Grbl Controller
I wish I could help you, but I have not been able to get XLoader to upload files to my arduino. I tried the most recent today and still having trouble. I recommend using ArduinoUploader. See my posting here for more info:
https://zapmaker.org/2012/12/flashing-arduino-omni-for-uno-with-grbl-2/
I did succed in getting Xloader to upload Grbl, I succeeded once I installed dotnet 4.0
and I selected 115200 baud rate.
Hope it works for you
Andrew