bootloader/bootloader.c:102: error 158: overflow in implicit constant conversion

I keep getting this error when I try to use the makefile to compile the source code. I believe this error is coming from SDCC but I am unsure of how to fix it. The code in question is

for (i = 0; i < 255; i++) {

Start by reproducing the makefile build and inspect bootloader/bootloader.c around line 102, especially the loop shown in the report. Check how SDCC handles the loop bound and confirm the project builds successfully after the compiler error is resolved.

Written by the indexing model from the issue text.