Quartz64 Development

This page documents the current status of software support for the Quartz64 single-board computer, and provides links to resources to help prospective contributors get started. Information is kept current on a best-effort basis as various patches get accepted into the kernel.

Overview

Upstreaming Status

Function	Status		Component	Notes
Video Output	Needs porting		rockchipdrm/VOP-v2
3D Acceleration	Linux Mainline	Upstream Mesa	panfrost
Video Decode	Linux Staging	Not in ffmpeg[1]	hantro-vpu, using v4l2-requests	Necessary device tree changes in review
Audio	Needs porting		rockchip-i2s-tdm	i2s i2s fix vad pdm spdif A port of the i2s-tdm driver for mainline exists, but the code quality isn't good enough for submitting it upstream.
	Linux Mainline		rk817-codec	As of 5.14
u-boot	Waiting on ATF sources
Device Tree	Basic Quartz64 Model A device tree in linux-next[2]
Gigabit Ethernet	Linux Mainline		rk3566-gmac	As of 5.14[3]
	Linux Mainline		yt8511-phy	As of 5.14[4]
IOMMU	Linux Mainline		rockchip-iommu	As of 5.14[5]
GPIO	In review[6]		gpio-rockchip
pinctrl	Linux Mainline
Thermal Regulation	Linux Mainline		rockchip-thermal	As of 5.14[7]
PCIe	In review[8]		pcie-dw-rockchip
Power Management	Linux Mainline		rockchip-pm-domain	As of 5.14[9]
Voltage Control	In review[10]		rk3568-pmu-io-voltage-domain
SPI	Linux Mainline		spi-rockchip	As of 5.14[11]
Battery	In review[12]		rk817-charger	In the BSP tree this is handled by rk817_battery.c and rk817_charger.c
Microphone	linux-next[13]		rockchip-saradc	Headphone jack mic seems to connect to SARADC_VIN2_HP_HOOK, so I'm pretty sure that the dtsi and driver changes are needed for that mic to work
USB 2.0	In review[14]		rockchip-usb2phy
e-Ink	Needs reversing		ebc-dev?	See RK3566 EBC Reverse-Engineering

Current Status

The following sections give an overview over the current status of different parts of the board. Some parts are waiting on a driver to be written or ported, others only need various adjustments.

According to pgwipeout, I/O device performance is within expected ranges now.

Working

• eMMC
• SDMMC0 (SD cards)
• GMAC (Gigabit Ethernet)
• USB 2.0
• SATA 2
• SATA 3
• UART
  • UART 0 (Pi-bus)
  • UART 1 (Bluetooth)
  • UART 2 (Pi-bus, debug)
• Video Decode
  • VP8
• Battery

Partially Working

• PCI-Express Controller — everything but devices that need cache coherency (e.g. dGPUs) should work
• USB 3.0 — only works with very short cables and depends on the device. This is likely due to a hardware design issue relating to the coupling capacitors needed for SATA, which shares the same lines as USB 3.0.
• SDMMC1 (Wi-Fi) — AP6256 working, BL602 needs some work to make it flash firmware
• I²C — works but is not yet exposed to the Pi-bus
• GIC — needs errata published by Rockchip to get upstream to add device-specific workarounds^[15]
• Audio
  • Simple port of downstream i2s-tdm driver for analog audio output exists and works. Needs cleanup/rewrite before it's worthy of being submitted upstream.
  • no HDMI or SPDIF yet

Confirmed Broken

• Nothing!

Needs Testing

• GPU — need a VOP-v2 DRM driver to get display output
• E-Paper — needs EBC driver
• SPI

TODO

i2s-tdm Cleanup

The i2s-tdm driver needs cleanup before it can be submitted upstream. For example, the probe function needs to be rewritten, the udelay(150) clear calls should be factored out into a function instead of repeated several times in the code, and other strange things in the code need to be cleaned up.

ebc-dev Reverse Engineering and Development

The driver for the eInk panel needs to both be reverse engineered and then rewritten as C. In its current form, it is mostly an assembly dump produced by gcc with debug symbols. See RK3566 EBC Reverse-Engineering for details.

VOP2 Porting

The VOP2 portion of the rockchip-drm driver needs to be ported from the downstream kernel. This driver enables video output. Preliminary research has determined that this is a fairly big task.

Rumour has it that Collabora has written an unfinished port, but to our knowledge it was never published anywhere.

Resources

Repositories

• pgwipeout's kernel tree
  • https://gitlab.com/pgwipeout/linux-next/-/tree/quartz64-5.14
• BSP based development effort for SPL/U-Boot and Linux
  • https://gitlab.com/pine64-org/quartz-bsp
• Image CI pipeline aimed at developers
  • https://gitlab.com/pgwipeout/quartz64_ci/
• Rockchip U-Boot
  • https://github.com/rockchip-linux/u-boot

Other

• Rockchip-SoC Patchwork Page
  • https://patchwork.kernel.org/project/linux-rockchip/list/
• Rockchip Kernel Mailing List Archive
  • https://lore.kernel.org/linux-rockchip/

Board/SoC Documentation

Booting

Boot Order

The RK3566 boot ROM will search for a valid ID BLOCK in the following order on the support boot media:

• SPI NOR flash
• SPI NAND flash
• SD-Card
• eMMC

... if this fails, the boot ROM will initialize the USB0 port and wait for a connection from the Rockchip flash/boot tools.

Bootloader Flashing

As per pgwipeout's commit message:

• Make a partition named uboot as partition number 1 at 8 MiB to 16 MiB
• dd if=idblock.bin of=/dev/<mmc/sd> seek=64
• dd if=uboot.img of=/dev/<mmc/sd>1