08:30 <Kwiboo> macromorgan: is mainline u-boot will first add a memory bank for 0x200000 - 0xf0000000 (min(ram_top, gd->ram_top)) in as seen in dram_init_banksize(), gd->ram_top will max be CFG_SYS_SDRAM_BASE (0x0) + SDRAM_MAX_SIZE (0xf0000000) on rk3588

08:33 <Kwiboo> a second memory bank is added for any memory beyond 4GB mark (0x100000000) - gd->ram_size, i.e the memory size as reported by rockchip_sdram_size(), based on info read from sys_reg2+3 and sys_reg4+5

08:39 <Kwiboo> is rockchip_sdram_size() reporting 12GB for your board? what does the debug() print for your 12 GB board in rockchip_sdram_size()?

08:41 <Kwiboo> I remember that when I worked on https://source.denx.de/u-boot/u-boot/-/commit/bde73b14f0f46760f1a0ec84a9474ed93a22e496 there is two fields in reg, cs2/3_delta_row, that I do not know if they should affect memory size

17:56 <macromorgan> Kwiboo: I'll have to try a bit more later today, but Linux at least is showing 11.7GB. It's seeing the full RAM more or less.