aspeed: add a max_ram_size property to the memory controller
This will be used to construct a memory region beyond the RAM region to let firmwares scan the address space with load/store to guess how much RAM the SoC has. Signed-off-by: NCédric Le Goater <clg@kaod.org> Signed-off-by: NJoel Stanley <joel@jms.id.au> Tested-by: NCédric Le Goater <clg@kaod.org> Message-id: 20180807075757.7242-7-joel@jms.id.au Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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