arm64: dts: rockchip: add R69 XR821 TV box - #528
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Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review. WalkthroughThe change adds the R69 XR821 device tree and registers its DTB build target. The device tree configures board identity, CPU, GPU, DDR, Ethernet, storage, Wi-Fi, Bluetooth, HDMI, audio, USB, watchdog, UARTs, GPIOs, LEDs, infrared input, display hardware, CMA memory, OTP data, and shared PWM power regulation. Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The device-tree addition enables board-specific peripherals, but it may remove the declared boot console and retain only 8 MiB of contiguous DMA memory, which can impair serial diagnostics and constrain common Full HD display buffering. Merge should wait for these settings to be corrected or explicitly accepted by the owner. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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rpardini
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Guess I already said similar elsewhere, but again: adding decompiled DTB->DTS (with phandles) is (IMHO) going too far.
My suggestion is, find the similar-est proper DTS, compile to DTB, decompile it, then compare with the R69-decompiled one, and produce a "proper" DTS. Armbian's ./compile BOARD=x BRANCH=y kernel-dtb (ran on recent-enough dtc) produces helpful preprocessed/sorted/phandle-removed versions in output/ exactly for this purpose.
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If phandles are resolved to named &label references, but the file stays monolithic with no #include - acceptable? |
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Actionable comments posted: 3
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Inline comments:
In `@arch/arm64/boot/dts/rockchip/rk3518-r69-xr821.dts`:
- Line 17: Replace the `/delete-node/ &chosen;` directive with a `/chosen` node
that declares `stdout-path` as `serial0:1500000n8`, preserving the enabled UART0
configuration so boot paths without an injected console argument retain a serial
console.
- Around line 454-462: Remove the cma node under reserved_memory, including
linux,cma-default, so the board retains the kernel-configured CMA size instead
of forcing an 8 MiB default pool.
- Around line 201-208: Remove the unsupported mmc-hs200-enhanced-strobe property
from the &sdhci device-tree override, while retaining the valid HS200 speed and
frequency settings.
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arch/arm64/boot/dts/rockchip/Makefilearch/arm64/boot/dts/rockchip/rk3518-r69-xr821.dts
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@rpardini Done - rebased onto the reference DTS instead of carrying the decompiled tree. It now includes rk3528-evb1-ddr4-v10.dtsi (the design the vendor derived this box from, per its own I'll be honest I'm not sure how much this buys a one-off TV box, and I may be missing something - what's the payoff you're after downstream? Reviewability, or tracking dtsi changes across kernel bumps? |
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Some phandle drift was not noticed, fixed |
Rockchip RK3518A (RK3528 family), quad Cortex-A53, Mali-450, 2GB DDR4, 16GB eMMC, microSD, 10/100 Ethernet on the integrated PHY, AIC8800D80 SDIO Wi-Fi with UART Bluetooth, USB2, USB3, HDMI, AV jack and an IR receiver. The vendor ships no source for this board, only a DTB in its boot partition. That tree's compatible names rk3528-evb1-ddr4-v10, and comparing the two confirms the lineage - they share 580 of about 600 nodes - so this includes the reference board and overrides what differs rather than carrying a decompiled tree. The overrides are the box's own hardware and carry no reasons, because the blob carries none. The deliberate departures from the factory tree are listed in the file header, next to the tree they describe. Verified by compiling this file and comparing it against the factory blob: the trees are content-identical, every phandle reference resolving to the same node, and the result boots on the hardware. Named for the PCB silkscreen, XR821_V1.1: "R69" alone is overloaded - Armbian already ships sunvell-r69 for an unrelated Allwinner box - and these boxes vary between production runs. Signed-off-by: Artem Butusov <art.sormy@gmail.com>
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If it's a "one-off" you wouldn't (/shoudn't) be submitting it here. And yes, being able to (collectively) bump (we've a rkr7.2 branch going already) and also being able to reason about what's in the DT is a bigger objective than "get a tvbox working". With a decent-ish DT you can then start porting it to mainline, which should be the real objective for any and all boards, tvboxes or no.
While this is already drastically better than the decompiled-DT, I'd not include the rk3528-evb1-ddr4-v10.dtsi - you end up with way too many delete-node's and such. A plain .dts with just the normal includes would read much better. Jjust |
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Thanks for the review — taking the one-off point at face value, closing. $35 box, already working, The kernel fixes I've sent are board-independent and don't depend on this PR — I'd still like those Moot now, but for the record, in case it helps whoever picks up rk3528 next: the suggested form
No perfect pick. I used If anyone wants automated rebases on top of a stock DTS, the tooling is at |
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Sad you closed this @sormy -- wasn't my intent. The whole effort could open up the way for other boxes in the future. Considering proper SBC vendors have mostly stopped producing boards due to the DDR/eMMC pricing, el-cheapo tvboxes might be one way to get this hardware without expending hundreds of $ going forward. Assuming you'll reconsider, maybe what we're missing is a |
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The R69 XR821 is an RK3518 (RK3528 family) TV box. This adds its device tree.
The vendor ships no source, only a binary DTB in the boot partition, so this is built
on
rk3528-evb1-ddr4-v10.dtsi— the reference design the box actually derives from,as its own compatible says — with the differences expressed as overrides.
Changes vs the vendor's tree
compatiblerockchip,rk3528a, as rkmpp has nork3518entry and cannot reach the VPU without itmodelgpubus/coreclock and irq names, not the vendor Mali blob'suart0okay+uart0m0_xfer— the debug header, as ttyS0fiq-debuggerdisabled; it owns ff9f0000 otherwiseuart2bluetoothchild, binding the AIC8800 to the H:4 serdev driverpwm@ffa90030remote_support_psci = 1, so the IR remote can power the box onwatchdogokay, for systemd'sRuntimeWatchdogSecledspower/standbynames +retain-state-*so the LED core stops clearing themchosenEight hunks, each with a functional consumer. Nothing else is touched. The
include/override split is only how this is expressed against the reference board —
the real content is the diff below, against the box's own factory DTB (decompiled,
phandle references reconstructed).
Full diff against the factory tree
Verification
(phandle numbering aside — allocated per compile, carries no meaning).
running the box — 12.6 s boot, no failed units, LEDs, watchdog, Wi-Fi, Bluetooth,
eMMC/SD and CPU OPPs all as expected.