On Fri, Mar 23, 2018 at 5:39 PM, Maxime Ripard <[email protected]> wrote: > 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? > >> 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.
AFAIK even though we do have LPAE, the hardware bus is not wired up to take advantage of it. :( ChenYu _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
