[U-Boot] [PATCH v4] p1022ds: use weak CFI flash accessors when DIU is enabled

[Anatolij Gustschin <agust@denx.de>]

On Sat, 25 Sep 2010 14:51:22 +0200
Anatolij Gustschin <agust@denx.de> wrote:

> From: Timur Tabi <timur@freescale.com>
> 
> On the Freescale P1022, the DIU and the LBC share address pins, which means
> that when the DIU is active (e.g. the console is on the DVI display), NOR flash
> cannot be accessed.  So we use the weak accessor function feature of the CFI
> flash code to temporarily switch the pin mux from DIU to LBC whenever we want
> to read or write flash.  This has a significant performance penalty, but it's
> the only way to make it work.
> 
> This change allows the 'saveenv' command to work when the video display is
> enabled.  Erasing flash and writing to flash (with the 'cp' command) works,
> but reading from flash (with the 'md' and 'cp' commands) does not.  Also, while
> flash is being written, the video display will be blank.
> 
> Signed-off-by: Timur Tabi <timur@freescale.com>
> Signed-off-by: Anatolij Gustschin <agust@denx.de>
> ---
> v4:
>  - rebased on current u-boot-video/next
> 
>  board/freescale/p1022ds/diu.c |  208 +++++++++++++++++++++++++++++++++++++++--
>  include/configs/P1022DS.h     |    6 +
>  2 files changed, 207 insertions(+), 7 deletions(-)

Applied to u-boot-video/next.

Anatolij