Linux 2.4.17 bug, mmap of /dev/mem

[Wolfgang Denk]

In message <3C7AA49D.8020809 at embeddededge.com> you wrote:
>
> memory spaces.  A common mistake is people map things like GPIO into
> application space, and then think they can atomically update the
> registers.  This doesnt' work because there may be drivers that
> also do the same thing.

...and things get even worse when you happen to use the  RISC  timers
for  one  or  more  PWM  channels: you'll see completely asynchronous
updates of PBDAT :-(

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"Engineering without management is art."               - Jeff Johnson

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