[U-Boot] ARM v7: Flush icache when executing a program with go

["Henrik Nordström" <henrik@henriknordstrom.net>]

tis 2013-05-21 klockan 14:26 +0200 skrev Wolfgang Denk:

> > but imho the user shouldn't really need to care for these and is why I
> > hooked into the go command.
> 
> In this case you should use the common C API.

Unfortunately the go command do now know what range(s) it needs to
flush.

> No.  bootm  knows exactly the location and size of the image, so it is
> sufficient to flush / invalidate a part of the memory, usually a
> pretty small one compared to the total RAM size.

See arch/arm/cpu/armv7/cpu.c cleaup_before_linux() for what I am talking
about regarding bootm.

> > And I do not think there needs to be commands for flushing specific
> > regions other than for testing. Region based flushing is better done by
> > code which knows what is needed. It's hard for users to get this right
> > as most times it works anyway.
> 
> The code should know which ranges need flushing, not the user.

Agreed. But I don't see how this can be done for go.

Should we instrument all the load commands to remember which ranges
something have been loaded into since last flush?

Regards
Henrik