We have 256M of ram, be where the heck is it in the address map? The 4G address space sets aside the first 1G for ram, so that narrows it down somewhat. It turns out that by the time U-boot is running, the same 256G is aliased to four locations:
0x0000_0000 to 0x0fff_ffff 0x1000_0000 to 0x1fff_ffff 0x2000_0000 to 0x2fff_ffff 0x3000_0000 to 0x3fff_ffffThat is simple enough. Take your pick.
There is also 256K of OCM (on chip memory). The above is the DDR ram. By the time U-Boot is running and willing to talk to us, the OCM is at the high end of the address map at:
0xfffc_0000 to 0xffff_ffffThat is all I know at this time.
Tom's Computer Info / tom@mmto.org