Albert ARIBAUD <[email protected]> writes: >> > Please do not advise using native unaligned accesses on code that is >> > not strictly used by ARMv6+ architectures: the present code, for >> > instance, might be run on pre-ARMv6 or non-ARM platforms, and thus, >> > should never assume ability to perform unaligned accesses natively. >> >> I'm advising no such thing. I said two things: >> >> 1. Declaring a struct with the 'packed' attribute makes gcc >> automatically generate correct code for all targets. _IF_ the >> selected target supports unaligned ldr/str, these might get used. >> >> 2. If your target is ARMv6 or later _AND_ you enable strict alignment >> checking in the system control register, you _MUST_ build with the >> -mno-unaligned-access flag. > > Then I apologize; I had read "Note that on ARMv6 and later ldr/str > support unaligned addresses unless this is explicitly disabled in > the system control register" as a suggestion to use that capability.
If building for ARMv6 or later, I do suggest allowing unaligned accesses. The moment you add -march=armv6 (or equivalent), you allow for a number of things not supported by older versions, so why not unaligned memory accesses? -- Måns Rullgård [email protected] _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
