Searching for forum for help on dts devel for RK3568 board

[Heiko Stübner]

Hi Erik,

Am Sonntag, 1. Juni 2025, 23:52:14 Mitteleuropäische Sommerzeit schrieb Erik Beck:
> Hi Heiko,
> 
> Thanks for the fast response!
>
> I'll give libera.chat a try.
> 
> I've been looking at the schematics, and they have helped somewhat, but
> not getting me unstuck at the moment. The V2 should be pretty similar
> to the V1, but there might be an important difference I'm overlooking.
> 
> I'll give a look at those boards you mentioned. I've been using the
> BPI-R2-Pro for inspiration. It has also helped, but there might be
> something in the other boards relating to the PCIe bus that might help.
> 
> I've been putting the work up onto github; current branch is:
> https://github.com/TahomaSoft/openwrt-openwrt/tree/ExpDev-WIP7
> 
> Direct link to the DTS is:
> https://github.com/TahomaSoft/openwrt-openwrt/blob/ExpDev-WIP7/target/linux/rockchip/patches-6.6/036-arm64-dts-rockchip-linkstar-minimal.patch

The the big neon sign on first glance is the missing lane-limitation.

pcie3x2 and pcie3x1 share their lanes, so depending on the board wiring
you can either do pcie3x2 with 2 lanes, or both with 1 lane each.

See the
	num-lanes = <1>;
lines in the devicetrees using both pcie controllers.


Heiko


> Thank you/Danke,
> 
> Erik
> ~~~
> On Sun, 01 Jun 2025 23:11:56 +0200
> Heiko Stübner <heiko at sntech.de> wrote:
> 
> > Hi Erik,
> > 
> > Am Sonntag, 1. Juni 2025, 22:39:01 Mitteleuropäische Sommerzeit
> > schrieb Erik Beck:
> > > I am working on initial support for an RK3568 board, the LinkStar
> > > H68K-1421v1. I've made some progress, but can't get past turning on
> > > one of the two PCIe3 Host bridges (pcie3x1 pcie at fe270000) without
> > > breaking the boot.
> > > 
> > > Is this the right location to ask for help? If not, where might be?
> > >  
> > 
> > The mailinglist mostly has patches on it, so I don't really know if
> > people are expecting non-patch mails.
> > 
> > If in doubt the #linux-rockchip channel on the libera.chat IRC
> > network [0] might help more. (people in different timezones, so
> > probably no immediate answers)
> > 
> > 
> > 
> > For the multi-pci case I guess you could start by looking at other
> > rk3568 board doing similar things, like the Qnap-TS433 [1], Radxa E25
> > [2] or Nanopi-R5S [3].
> > 
> > Generally board designers often follow reference designs, so things
> > might be similar.
> > 
> > Similarly, you might want to push your current in progress work on
> > some github thing, so people can take a look.
> > 
> > 
> > It also looks like the H68KV2 variant of the device has schematics
> > available as linked from the bottom of [4], not sure how that relates
> > to your device though.
> > 
> > 
> > Heiko
> > 
> > 
> > [0] https://libera.chat/
> > [1]
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3568-qnap-ts433.dts
> > [2]
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3568-radxa-e25.dts
> > [3]
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts
> > [4]
> > https://github.com/Seeed-Studio/wiki-documents/blob/docusaurus-version/docs/Network/RK_Devices/H68K_V2/H68KV2_install_system.md
> > 
> > 
> > 
> > _______________________________________________
> > Linux-rockchip mailing list
> > Linux-rockchip at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip
> 
>