cvmx_fuse_read_byte
fuse_data |= cvmx_fuse_read_byte(fuse_base + 3);
fuse_data |= cvmx_fuse_read_byte(fuse_base + 2);
fuse_data |= cvmx_fuse_read_byte(fuse_base + 1);
fuse_data |= cvmx_fuse_read_byte(fuse_base);