Tegra/Mainline SW/Linux kernel
< Tegra | Mainline SW(Redirected from Tegra/Linux kernel)
NVIDIA Tegra SoCs are well supported by mainline kernels.
Kernel releases may be obtained from:
- https://www.kernel.org/ releases, via download.
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/ releases, via git.
- https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/ absolute latest development code, via git.
The following mainline kernel releases introduced support for Tegra SoCs:
- Tegra20 has been upstream for many years.
- Tegra30 support was added in v3.3.
- Tegra114 support was added in v3.9.
- Tegra124 support was added in v3.13.
The first kernel release to support a given SoC has historically contained extremely minimal support. One or two kernel releases later will typically be the first useful version.
Features that already work are:
Function | Tegra20 | Tegra30 | Tegra114 | Tegra124 |
---|---|---|---|---|
It boots! | YES | > v3.3 | > v3.9 | > v3.13 |
Serial console | YES | YES | YES | YES |
CPU hotplug | YES | YES | YES | YES |
CPU frequency scaling | YES | ? | ? | ? |
CPU Thermal sensors | YES | ? | ? | ? |
I2C master | YES | YES | YES | YES |
Regulators | YES | YES | YES | YES |
SPI | YES | YES | YES | YES |
SD/eMMC | YES | YES | YES | YES |
USB 2.0 Host | YES | YES | YES | YES |
USB2 Device/OTG | YES | ? | ? | ? |
RGB/LVDS Display | YES | YES | ? | ? |
DSI Display | ? | ? | YES | ? |
eDP Display | ? | ? | ? | YES |
HDMI Display | YES | YES | YES | YES |
PCIe | YES | YES | ? | ? |
I2S Audio | YES | ? | ? | ? |
PWM | YES | ? | ? | ? |
NAND | YES | ? | ? | ? |
A probably-incomplete list of features that are not yet implemented is:
- Kepler GPU support via Nouveau (work in progress).
- Advanced (high-speed) transfer modes for SD and eMMC. IO voltage scaling.
- PCIe on Tegra124. Thierry Reding is working on this.
- USB3 controller. Andrew Bresticker is working on this.
- SATA.
- SKU awareness (SKU-specific clock and thermal limits).
- POR (Plan Of Record) clocks.
- cpufreq for SoCs other than Tegra20.
- EMC (memory controller) frequency scaling.
- DVFS (Dynamic Voltage and Frequency Scaling).
- USB2 bus power saving.
- I2C slave support. The Toshiba AC100 NVEC driver could be generalized to provide this.
- SPI slave support?