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Author SHA1 Message Date
Felix Fietkau
22d982ea00 ramips: add support for switching between 3-byte and 4-byte addressing on w25q256 flash
On some devices the flash chip needs to be in 3-byte addressing mode during
reboot, otherwise the boot loader will fail to start.
This mode however does not allow regular reads/writes onto the upper 16M
half. W25Q256 has separate read commands for reading from >16M, however
it does not have any separate write commands.
This patch changes the code to leave the chip in 3-byte mode most of the
time and only switch during erase/write cycles that go to >16M
addresses.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2017-11-02 15:58:45 +01:00