On Tue, Jul 6, 2021 at 8:03 AM Trevor Woerner <[email protected]> wrote: > > Hi, > > I was hoping that one day support would be added for the rockchip rock960c > board (from the 96boards series, https://www.96boards.org/product/rock960c/). > NOTE: this board is different from the rock960 board (aka rock960 a/b) that is > currently supported. > > Schematics and datasheets aren't easy to come by. A while back someone > mentioned that the only difference between the rock960 a/b and the rock960c is > that the rock960c uses different SDRAM (LPDDR4 instead of LPDDR3). Searching > around on the Internet it would appear that the rock960c uses the same SDRAM > as the rock-pi-4 devices (maybe?).
I don't think it has a USB-C port, nor a onboard eMMC, although from memory it does have a header. > The actual SDRAM on the board is H9HCNNN4KUML-HRNMN, but I can't find a > datasheet for it anywhere, not even on Hynix's website. > > I tried creating a rock960c device by copying the rock960 things. The one > change I made was that my rk3399-rock960c-u-boot.dtsi file has: > > #include "rk3399-sdram-lpddr4-100.dtsi" > > (which is what the rock-pi-4 is using) instead of: > > #include "rk3399-sdram-lpddr3-2GB-1600.dtsi" You'll probably need to add/update a DDR line in the config file as well. > (which is what rk3399-rock960-u-boot.dtsi is using). Unfortunately this > doesn't succeed. The TPL is invoked, then there's nothing else on the console: > > U-Boot TPL 2021.04 (Jun 30 2021 - 18:16:57) > > I then tried building and using the vendor-supplied u-boot fork for the > rock960c which is found here: > > git://github.com/96rocks/u-boot.git > > but it is quite old (U-Boot 2017.09) and pre-dates the TPL/idbloader things. > If I understand things correctly, the vendor branch only builds u-boot and the > spl, I then need to mash in some sort of binary ddr file to the spl to get a > working first-stage bootloader (?). I'm unclear how to take the build output > from the vendor branch and create a working bootloader to load on my sdcard > (the only docs for the rk3399 in that branch are generic and don't refer to > things that come out of the build for the rock960c). I personally wouldn't waste your time with the vendor one, I would think everything needed is already upstream for the core support. > In any case, if anyone has any any tips etc I'd appreciate it :-) There's not an upstream dts either, which probably isn't a big issue for the basics. I don't remember whether or not if I have a revC of these boards somewhere, I can't promise timing wise but if I get a moment I'll see if I can work out if I have one.
