u-boot idbloader.img fails to initialise LPDDR3 on nanopi m4 v1

[Christopher Obbard]

hi!

Both 2020.04, 2021.01 and latest u-boot HEAD fails to setup nano pi m4
V1 LPDDR3.

these are compiled with latest ATF HEAD. Any pointers on where to debug ?

For what it's worth; I can boot on nanopi m4 V2 board with patch[1],
so I am sure it's a DDR thing.

U-Boot TPL 2020.04 (Feb 06 2021 - 09:28:53)
sdram_init: LPDDR3 - 933MHz failed!
rk3399_dmc_init DRAM init failed -22
Missing DTB

U-Boot TPL 2021.01 (Feb 05 2021 - 12:45:32)
sdram_init: LPDDR3 - 933MHz failed!
rk3399_dmc_init DRAM init failed -22
Missing DTB

thanks!
Chris

[1]: https://patchwork.ozlabs.org/project/uboot/patch/20201018052548.29195-1-libunko@qq.com/