MainMesa assembly bug on Respberry Pi / VC4 with fix After a few days of banging my head against this and chasing a red herring in gdb and with some help from HdkR I found the problem. Mesa’s VC4 code that uploads (and downloads) texture tiles has incorrect ARM assembly in it. It forgot that some of the input parameters to be held in registers are actually modified by the ASM and declared them as "r"
