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

--- So this is my attempt to describe (my understanding of) how this option should be used. Any suggestions for improvement are most welcome.

Changes in v2: - Dropped RFC - Added review from Stefan

README | 13 +++++++++++++ 1 file changed, 13 insertions(+)

diff --git a/README b/README index 3b406c2..c3fa549 100644 --- a/README +++ b/README @@ -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