Follow-up Comment #29, sr #111312 (group freeipmi): Okay, I think I found the problem. The C standard does not explicitly define "char" as signed or unsigned, and the default is compiler and architecture-dependant. on x86, "char" is signed by default, so the code works correctly. on ARM, it is unsigned by default, which breaks the code. Explicitly using "signed char" instead of "char" will remove the compiler-dependent behavior and fix the issue on ARM, without changing the behavior on x86. I think it should be safe to correct the code just by changing the cast to "signed char".
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