On Mon 2021-07-12 @ 07:54:44 AM, Peter Robinson wrote: > On Tue, Jul 6, 2021 at 8:03 AM Trevor Woerner <twoer...@gmail.com> 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.
It does have a USB-C port (although I'm using the separate 12V plug for power) but you're right about the rest (it doesn't have onboard eMMC, but does have a header if the user wants to populate one). > > 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. Okay, I'll take a second look. > > (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. Agreed. The vendor branch is so old I don't think it is useful anymore. Best to just start with U-Boot master and tweak from there. > > 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. Sounds good, thanks! :-)