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README: Describe CONFIG_SYS_NO_FLASH

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Unlike most configuration options defining this actually disables
support for a feature (parallel flash). Eventually the logic behind this
should probably be flipped so that '#ifndef CONFIG_SYS_NO_FLASH' becomes
'#ifdef CONFIG_HAS_PARALLEL_FLASH' but for now lets document the
existing behaviour.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Chris Packham 2015-06-19 20:25:59 +12:00 committed by Tom Rini
parent 334bbb387f
commit 3b10cf120b
1 changed files with 13 additions and 0 deletions
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@ -3037,6 +3037,19 @@ CBFS (Coreboot Filesystem) support
this is instead controlled by the value of
/config/load-environment.
- Parallel Flash support:
CONFIG_SYS_NO_FLASH
Traditionally U-boot was run on systems with parallel NOR
flash. This option is used to disable support for parallel NOR
flash. This option should be defined if the board does not have
parallel flash.
If this option is not defined one of the generic flash drivers
(e.g. CONFIG_FLASH_CFI_DRIVER or CONFIG_ST_SMI) must be
selected or the board must provide an implementation of the
flash API (see include/flash.h).
- DataFlash Support:
CONFIG_HAS_DATAFLASH