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Modern big flash NOR devices consist of more than one die. Some of them do not support chip erase and instead have a die erase command that can erase one die only. This commit adds support for defining the number of dies in the chip, and adds support for die erase command. The NOR flash model is not strict, so no option to disable chip erase has been added. Signed-off-by: Marcin Krzeminski <mar.krzeminski@gmail.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20170108083854.5006-3-mar.krzeminski@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>