Barebox working on freescale-mx25-3-stack?
matthias at kaehlcke.net
Wed Mar 24 11:30:37 EDT 2010
El Wed, Mar 24, 2010 at 04:23:33PM +0100 Ivo Clarysse ha dit:
> On Wed, Mar 24, 2010 at 4:08 PM, Matthias Kaehlcke
> <matthias at kaehlcke.net> wrote:
> > after applying your patch barebox effectivly came up :)
> > thanks a lot!
> > could you explain in few words why the patch is needed?
> RAM initialization is implemented in two places: lowlevel_init.S and
> the "Device Configuration Data" (DCD) block.
> When booting from an SD card, the i.MX25 reads out the DCD block and
> applies the settings found there.
> The RAM initialization in lowlevel_init.S is skipped when booting from
> SD; by the time board_init_lowlevel gets executed,
> that routine is already running from RAM, and will skip initializing memory.
> The DCD table in barebox git contains entries for mDDR memory. This
> does not work with DDR2 memory.
> Probably barebox needs a compile-time option to switch between 128 MiB
> mDDR memory installed on older MCIMX25PDK CPU engine boards and the 64
> MiB DDR2 memory found on newer boards.
thanks a lot for your explication!
i wasn't aware that differently equipped CPU engine boards exists,
good to know
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