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authorChris Packham <judge.packham@gmail.com>2015-06-19 20:25:59 +1200
committerTom Rini <trini@konsulko.com>2015-06-19 16:46:50 -0400
commit3b10cf120befe9c2e938a7d4e04eb0b545ee347a (patch)
tree1c8d74dc492181409795c1c82c23a9d41e832257 /README
parent334bbb387f2d369f4cf0b28173f0764c8316fd5b (diff)
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README: Describe CONFIG_SYS_NO_FLASH
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>
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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
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