Hi Reinhard, [...]
>> Note that this is with GCC 4.2.2. Even GCC 4.0.0 behaves the same, so >> this is *not* an issue with very recent tool chains. > > OK, for directly adressing elements inside a packed struct; > but the original post said: > > "struct xyz { > int x; > int y; > int z[CONST]; > } __attribute__ ((packed)); > > struct xyz *abc; > u32 * status_reg = (u32 *)&abc->z[0]; > > writel(status, status_reg);" > > So the "status_reg" pointer is in a completely unrelated (to the packed > struct) > "u32 *" and still the access is done like it was packed. If the > compiler silently drags that attribute along into the "u32 *" > THAT is really sick! I cannot follow why you think this is sick - actually I think this is clever. GCC "knows" that abc points to a packed struct and it has no clue on actual values, so it _has to assume_ it is not aligned. status_reg is initialized as a pointer to a member of this unaligned pointer and is thus also considered unaligned. Seems perfectly fine to me. Cheers Detlev -- BUGS: It is not yet possible to change operating system by writing to /proc/sys/kernel/ostype. -- Linux sysctl(2) man page -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot