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p1022ds: use weak CFI flash accessors when DIU is enabled

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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>
This commit is contained in:
Timur Tabi
2010-09-16 16:35:44 -05:00
committed by Anatolij Gustschin
parent d5e01e49f8
commit 55b05237b9
2 changed files with 207 additions and 7 deletions
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6
include/configs/P1022DS.h
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@@ -188,6 +188,12 @@
#define CONFIG_VGA_AS_SINGLE_DEVICE
#define CONFIG_VIDEO_LOGO
#define CONFIG_VIDEO_BMP_LOGO
#define CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
/*
* With CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS, flash I/O is really slow, so
* disable empty flash sector detection, which is I/O-intensive.
*/
#undef CONFIG_SYS_FLASH_EMPTY_INFO
#endif
/*