于 2018年3月23日 GMT+08:00 下午5:39:25, Maxime Ripard <[email protected]> 写到: >On Fri, Mar 23, 2018 at 04:18:53PM +0800, Icenowy Zheng wrote: >> Allwinner 64-bit SoCs can use 4GiB DRAM chip, however their memory >map >> has only allocated 3GiB for DRAM, so only 3GiB of the DRAM is >> accessible. > >How would that work in Linux?
>From CPU's view only 3GiB DRAM is attached, so Linux can use the 3GiB space only. Only the DRAM controller knows that 4GiB DRAM is connected :-) > >> Add a Kconfig option for the maximum accessible DRAM. >> >> For A80 it should be a much higher value (8GiB), but as I have no A80 >> device to test and originally U-Boot only supports 2GiB DRAM on A80, >it >> currently still falls under the 2GiB situation. > >I guess we have LPAE on armv7 to deal with this nicely. > >Maxime -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
