1: [[!meta title="NetBSD/evbarm on NVIDIA Tegra"]]
2:
3: NetBSD 8.0 supports the NVIDIA Tegra K1 (32-bit) system-on-a-chip.
4: NetBSD -current adds support for the NVIDIA Tegra X1 system-on-a-chip.
5:
6: The [NVIDIA Jetson TK1 development kit](https://developer.nvidia.com/jetson-tk1) is a board based on the Tegra K1 SoC.
7: The [NVIDIA Jetson TX1 development kit](https://developer.nvidia.com/jetson-tx1) is a board based on the Tegra X1 SoC.
8:
9:
10: [[!toc levels=2]]
11:
12: # Supported hardware
13: - CPU: Cortex-A15: NVIDIA Tegra K1 (T124) (4-core)
14: - VFP / NEON
15: - CPU frequency scaling
16: - CPU: Cortex-A57: NVIDIA Tegra X1 (T210) (4-core)
17: - VFP / NEON
18: - GIC
19: - ARM generic timer
20: - Clock and reset controller
21: - GPIO controller
22: - MPIO / pinmux controller
23: - Memory controller
24: - Power management controller
25: - I2C controller
26: - UART [[!template id=man name="com" section="4"]] serial console
27: - RTC
28: - Watchdog timer
29: - SDMMC [[!template id=man name="sdhc" section="4"]] controller
30: - USB 2.0 [[!template id=man name="ehci" section="4"]] controller
31: - USB 3.0 [[!template id=man name="xhci" section="4"]] controller
32: - Requires the [[!template id=pkg category="sysutils" name="tegra-firmware"]] package to be installed.
33: - PCI express
34: - SATA [[!template id=man name="ahcisata" section="4"]] controller
35: - HDMI
36: - Framebuffer console
37: - HDMI Audio [[!template id=man name="hdaudio" section="4"]] controller
38: - HDMI CEC
39: - Jetson TK1
40: - On-board Realtek 8111G [[!template id=man name="re" section="4"]] gigabit ethernet
41: - EEPROM [[!template id=man name="seeprom" section="4"]] (on I2C)
42: - TMP451 [[!template id=man name="titemp" section="4"]] temperature sensor (on I2C)
43: - RF kill switch
44: - Power button
45: - Jetson TX1
46: - On-board Realtek RTL8153 [[!template id=man name="cdce" section="4"]] gigabit ethernet
47: - AS3722 power management unit
48: - eFUSE
49: - SoC thermal sensors
50:
51:
52: # TODO
53: - Memory controller SMMU support
54: - APB DMA
55: - Audio Hub (AHUB)
56: - GPU (nouveau)
57: - SPI controller
58: - PWM controller
59: - PCIe MSI support
60: - CL-DVFS
61: - LVDS/eDP display output
62: - [[Chromebook|tegra-chromebook]] support
63:
64: # Generating a boot script
65:
66: The Tegra kernels need a .dtb for your board to boot. The dtb here was updated on 2017-04-13 and is generated from a Linux 4.10.10 source tree. [NVIDIA Jetson TK1 .dtb](http://ftp.netbsd.org/pub/NetBSD/misc/jmcneill/tegra/tegra124-jetson-tk1.dtb)
67:
68: [[!template id=programlisting text="""
69: $ cat boot.txt
70: setenv bootargs root=ld0a
71: fatload mmc 1:1 0x90000000 netbsd.ub
72: fatload mmc 1:1 ${fdt_addr_r} tegra124-jetson-tk1.dtb
73: fdt addr ${fdt_addr_r}
74: bootm 0x90000000 - ${fdt_addr_r}
75: $ mkubootimage -A arm -C none -O netbsd -T script -a 0 -n "NetBSD/tegra boot" boot.txt boot.scr
76: """]]
77:
78: # Getting U-Boot
79:
80: Jetson TK1 boards come with Linux4Tegra R19.x installed, which doesn't use U-Boot. The easiest way to get U-Boot is to upgrade to Linux4Tegra R21.x (Linux PC or VM required) following the [quick start guide](http://developer.download.nvidia.com/embedded/L4T/r21_Release_v4.0/l4t_quick_start_guide.txt).
81:
82: U-Boot for Jetson TX1 is available in pkgsrc: [[!template id=pkg category="sysutils" name="u-boot-jetson-tx1"]].
83:
84: # Modesetting
85:
86: ## Console
87:
88: To override the default video mode (auto-detected from display EDID), use the *video* kernel command-line parameter:
89:
90: [[!template id=programlisting text="""
91: video=<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
92: """]]
93:
94: ## Xorg
95:
96: To be able to use the mode setting features of the Tegra DRM driver, you must use the xf86-video-modesetting driver. Put this in xorg.conf:
97:
98: [[!template id=programlisting text="""
99: Section "Device"
100: Identifier "DRM Modesetting"
101: Driver "modesetting"
102: EndSection
103: """]]
104:
105: # GPU (nouveau)
106:
107: To enable the GPU, add the following before the `bootm` command in the boot script:
108:
109: [[!template id=programlisting text="""
110: fdt set /gpu@0,57000000 status okay
111: """]]
112:
113: For the nouveau driver to load successfully, firmware is required:
114:
115: * Install the [[!template id=pkg category="sysutils" name="tegra-firmware"]] package from pkgsrc.
116: * Extract the contents of [tegra-nouveau-firmware.tar.gz](http://cdn.netbsd.org/pub/NetBSD/misc/jmcneill/tegra/tegra-nouveau-firmware.tar.gz) to ''/libdata/firmware/nouveau''.
117:
118: You should see the following messages at boot:
119:
120: [[!template id=programlisting text="""
121: nouveau0 at fdt0: GPU
122: drm kern info: nouveau [ DEVICE][nouveau0] BOOT0 : 0x0ea000a1
123: drm kern info: nouveau [ DEVICE][nouveau0] Chipset: GK20A (NVEA)
124: drm kern info: nouveau [ DEVICE][nouveau0] Family : NVE0
125: drm kern info: nouveau [ PFB][nouveau0] RAM type: stolen system memory
126: drm kern info: nouveau [ PFB][nouveau0] RAM size: 2019 MiB
127: drm kern info: nouveau [ PFB][nouveau0] ZCOMP: 0 tags
128: drm kern info: nouveau [ PGRAPH][nouveau0] using external firmware
129: drm kern info: nouveau [ DRM] VRAM: 2019 MiB
130: drm kern info: nouveau [ DRM] GART: 1048576 MiB
131: drm kern error: nouveau E[ PFIFO][nouveau0] unsupported engines 0x00000030
132: drm kern error: nouveau E[ DRM] failed to create ce channel, -22
133: drm kern info: nouveau [ DRM] MM: using GRCE for buffer copies
134: nouveau0: initialized nouveau 1.1.1 20120801 on minor 1
135: """]]
136:
137: # dmesg
138:
139: [[!template id=programlisting text="""
140: Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
141: 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
142: The NetBSD Foundation, Inc. All rights reserved.
143: Copyright (c) 1982, 1986, 1989, 1991, 1993
144: The Regents of the University of California. All rights reserved.
145:
146: NetBSD 7.99.23 (JETSONTK1) #657: Sun Dec 13 12:33:17 AST 2015
147: jmcneill@megatron.local:/Users/jmcneill/netbsd/src/sys/arch/evbarm/compile/obj/JETSONTK1
148: total memory = 2047 MB
149: avail memory = 2020 MB
150: sysctl_createv: sysctl_create(machine_arch) returned 17
151: timecounter: Timecounters tick every 10.000 msec
152: mainbus0 (root)
153: cpu0 at mainbus0 core 0: 2316 MHz Cortex-A15 r3p3 (Cortex V7A core)
154: cpu0: DC enabled IC enabled WB disabled EABT branch prediction enabled
155: cpu0: 32KB/64B 2-way L1 PIPT Instruction cache
156: cpu0: 32KB/64B 2-way write-back-locking-C L1 PIPT Data cache
157: cpu0: 2048KB/64B 16-way write-through L2 PIPT Unified cache
158: vfp0 at cpu0: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
159: cpu1 at mainbus0 core 1
160: cpu2 at mainbus0 core 2
161: cpu3 at mainbus0 core 3
162: armperiph0 at mainbus0
163: armgic0 at armperiph0: Generic Interrupt Controller, 192 sources (183 valid)
164: armgic0: 32 Priorities, 160 SPIs, 7 PPIs, 16 SGIs
165: armgtmr0 at armperiph0: ARMv7 Generic 64-bit Timer (12000 kHz)
166: armgtmr0: interrupting on irq 27
167: timecounter: Timecounter "armgtmr0" frequency 12000000 Hz quality 500
168: tegrafdt0 at mainbus0
169: fdt0 at tegrafdt0: NVIDIA Tegra124 Jetson TK1
170: gic0 at fdt0: GIC
171: tegralic0 at fdt0: LIC
172: tegracar0 at fdt0: CAR
173: clock at fdt0 not configured
174: tegrampio0 at fdt0: MPIO
175: tegragpio0 at fdt0: GPIO
176: gpio0 at tegragpio0 (A): 8 pins
177: gpio1 at tegragpio0 (B): 8 pins
178: gpio2 at tegragpio0 (C): 8 pins
179: gpio3 at tegragpio0 (D): 8 pins
180: gpio4 at tegragpio0 (E): 8 pins
181: gpio5 at tegragpio0 (F): 8 pins
182: gpio6 at tegragpio0 (G): 8 pins
183: gpio7 at tegragpio0 (H): 8 pins
184: gpio8 at tegragpio0 (I): 8 pins
185: gpio9 at tegragpio0 (J): 8 pins
186: gpio10 at tegragpio0 (K): 8 pins
187: gpio11 at tegragpio0 (L): 8 pins
188: gpio12 at tegragpio0 (M): 8 pins
189: gpio13 at tegragpio0 (N): 8 pins
190: gpio14 at tegragpio0 (O): 8 pins
191: gpio15 at tegragpio0 (P): 8 pins
192: gpio16 at tegragpio0 (Q): 8 pins
193: gpio17 at tegragpio0 (R): 8 pins
194: gpio18 at tegragpio0 (S): 8 pins
195: gpio19 at tegragpio0 (T): 8 pins
196: gpio20 at tegragpio0 (U): 8 pins
197: gpio21 at tegragpio0 (V): 8 pins
198: gpio22 at tegragpio0 (W): 8 pins
199: gpio23 at tegragpio0 (X): 8 pins
200: gpio24 at tegragpio0 (Y): 8 pins
201: gpio25 at tegragpio0 (Z): 8 pins
202: gpio26 at tegragpio0 (AA): 8 pins
203: gpio27 at tegragpio0 (BB): 8 pins
204: gpio28 at tegragpio0 (CC): 8 pins
205: gpio29 at tegragpio0 (DD): 8 pins
206: gpio30 at tegragpio0 (EE): 8 pins
207: simplebus0 at fdt0: regulators
208: fdt1 at simplebus0
209: fregulator0 at fdt1: +VDD_MUX
210: fregulator1 at fdt1: +5V_SYS
211: fregulator2 at fdt1: +3.3V_SYS
212: fregulator3 at fdt1: +3.3V_RUN
213: fregulator4 at fdt1: +3.3V_AVDD_HDMI_AP_GATED
214: fregulator5 at fdt1: +USB0_VBUS_SW
215: fregulator6 at fdt1: +5V_USB_HS
216: fregulator7 at fdt1: +3.3V_LP0
217: fregulator8 at fdt1: +1.05V_RUN_AVDD_HDMI_PLL
218: fregulator9 at fdt1: +5V_HDMI_CON
219: fregulator10 at fdt1: +5V_SATA
220: fregulator11 at fdt1: +12V_SATA
221: dma at fdt0 not configured
222: tegrapmc0 at fdt0: PMC
223: tegramc0 at fdt0: MC
224: tegramc0: interrupting on LIC irq 109
225: tegrai2c0 at fdt0: I2C1
226: tegrai2c0: interrupting on LIC irq 70
227: iic0 at tegrai2c0: I2C bus
228: audio-codec at iic0 addr 0x1c not configured
229: titemp0 at iic0 addr 0x4c: TMP451
230: seeprom0 at iic0 addr 0x56: eeprom: size 256
231: tegrai2c1 at fdt0: I2C2
232: tegrai2c1: interrupting on LIC irq 116
233: iic1 at tegrai2c1: I2C bus
234: tegrai2c2 at fdt0: I2C3
235: tegrai2c2: interrupting on LIC irq 124
236: iic2 at tegrai2c2: I2C bus
237: tegrai2c3 at fdt0: I2C4
238: tegrai2c3: interrupting on LIC irq 152
239: iic3 at tegrai2c3: I2C bus
240: tegrai2c4 at fdt0: I2C5
241: tegrai2c4: interrupting on LIC irq 85
242: iic4 at tegrai2c4: I2C bus
243: as3722pmic0 at iic4 addr 0x40: AMS AS3822
244: as3722pmic0: default watchdog period is 10 seconds
245: tegrausbphy0 at fdt0: USB PHY2
246: tegrausbphy1 at fdt0: USB PHY3
247: tegrapcie0 at fdt0: PCIE
248: tegrapcie0: interrupting on LIC irq 130
249: pci0 at tegrapcie0 bus 0
250: pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
251: ppb0 at pci0 dev 0 function 0: vendor 10de product 0e12 (rev. 0xa1)
252: ppb0: PCI Express capability version 2 <Root Port of PCI-E Root Complex> x2 @ 5.0GT/s
253: ppb0: link is x1 @ 2.5GT/s
254: pci1 at ppb0 bus 1
255: pci1: i/o space, memory space enabled, rd/line, wr/inv ok
256: athn0 at pci1 dev 0 function 0: Atheros AR9285
257: athn0: rev 2 (1T1R), ROM rev 13, address 00:17:c4:d7:d0:58
258: athn0: interrupting at LIC irq 130
259: athn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
260: athn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
261: ppb1 at pci0 dev 1 function 0: vendor 10de product 0e13 (rev. 0xa1)
262: ppb1: PCI Express capability version 2 <Root Port of PCI-E Root Complex> x1 @ 5.0GT/s
263: ppb1: link is x1 @ 2.5GT/s
264: pci2 at ppb1 bus 2
265: pci2: i/o space, memory space enabled, rd/line, wr/inv ok
266: re0 at pci2 dev 0 function 0: RealTek 8168/8111 PCIe Gigabit Ethernet (rev. 0x0c)
267: re0: interrupting at LIC irq 130
268: re0: Ethernet address 00:04:4b:2f:51:a2
269: re0: using 512 tx descriptors
270: rgephy0 at re0 phy 7: RTL8251 1000BASE-T media interface, rev. 0
271: rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX, auto
272: tegradrm0 at fdt0
273: drm: Supports vblank timestamp caching Rev 2 (21.10.2013).
274: drm: No driver support for vblank timestamp query.
275: tegrafb0 at tegradrm0
276: tegrafb0: framebuffer at 0x9bc00000, size 1920x1080, depth 32, stride 7680
277: wsdisplay0 at tegrafb0 kbdmux 1
278: wsmux1: connecting to wsdisplay0
279: wsdisplay0: screen 0-3 added (default, vt100 emulation)
280: tegradrm0: info: registered panic notifier
281: tegradrm0: initialized tegra 0.1.0 20151108 on minor 0
282: tegratimer0 at fdt0: Timers
283: tegratimer0: default watchdog period is 10 seconds
284: flow-controller at fdt0 not configured
285: actmon at fdt0 not configured
286: apbmisc at fdt0 not configured
287: com0 at fdt0: ns16550a, working fifo
288: com0: console
289: com0: interrupting on LIC irq 122
290: spi at fdt0 not configured
291: spi at fdt0 not configured
292: tegrartc0 at fdt0: RTC
293: tegrafuse0 at fdt0: FUSE
294: emc at fdt0 not configured
295: ahcisata0 at fdt0: SATA
296: ahcisata0: couldn't acquire vddio-supply
297: ahcisata0: couldn't acquire avdd-supply
298: ahcisata0: interrupting on LIC irq 55
299: ahcisata0: AHCI revision 1.31, 2 ports, 32 slots, CAP 0xe620ff01<PSC,SSC,PMD,ISS=0x2=Gen2,SAL,SALP,SSNTF,SNCQ,S64A>
300: atabus0 at ahcisata0 channel 0
301: hdaudio0 at fdt0: HDA
302: hdaudio0: interrupting on LIC irq 113
303: hdafg0 at hdaudio0: NVIDIA Tegra124 HDMI
304: hdafg0: HDMI00 8ch: Digital Out [Jack]
305: hdafg0: 8ch/0ch 44100Hz PCM16*
306: audio0 at hdafg0: full duplex, playback, capture, mmap, independent
307: tegraxusbpad0 at fdt0: XUSB PADCTL
308: sdhc0 at fdt0: SDMMC3
309: sdhc0: interrupting on LIC irq 51
310: sdhc0: SDHC 4.0, rev 3, 32-bit ADMA2, 204000 kHz, HS SDR50 SDR104 HS200 1.8V 3.0V 3.3V, re-tuning mode 1, 4096 byte blocks
311: sdmmc0 at sdhc0 slot 0
312: sdhc1 at fdt0: SDMMC4
313: sdhc1: interrupting on LIC irq 63
314: sdhc1: SDHC 4.0, rev 3, 32-bit ADMA2, 204000 kHz, HS SDR50 SDR104 HS200 1.8V 3.0V 3.3V, re-tuning mode 1, 4096 byte blocks
315: sdmmc1 at sdhc1 slot 0
316: tegrasoctherm0 at fdt0: SOC_THERM
317: ahub at fdt0 not configured
318: ehci0 at fdt0: USB2
319: ehci0: interrupting on LIC irq 53
320: ehci0: EHCI version 1.10
321: ehci0: switching to host mode
322: usb0 at ehci0: USB revision 2.0
323: ehci1 at fdt0: USB3
324: ehci1: interrupting on LIC irq 129
325: ehci1: EHCI version 1.10
326: ehci1: switching to host mode
327: usb1 at ehci1: USB revision 2.0
328: pmu at fdt0 not configured
329: timer at fdt0 not configured
330: simplebus1 at fdt0: clocks
331: fdt2 at simplebus1
332: clock at fdt2 not configured
333: gpio-keys at fdt0 not configured
334: sound at fdt0 not configured
335: timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
336: cpu3: 2316 MHz Cortex-A15 r3p3 (Cortex V7A core)
337: cpu3: DC enabled IC enabled WB disabled EABT branch prediction enabled
338: cpu3: 32KB/64B 2-way L1 PIPT Instruction cache
339: cpu3: 32KB/64B 2-way write-back-locking-C L1 PIPT Data cache
340: cpu3: 2048KB/64B 16-way write-through L2 PIPT Unified cache
341: vfp3 at cpu3: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
342: cpu1: 2316 MHz Cortex-A15 r3p3 (Cortex V7A core)
343: cpu1: DC enabled IC enabled WB disabled EABT branch prediction enabled
344: cpu1: 32KB/64B 2-way L1 PIPT Instruction cache
345: cpu1: 32KB/64B 2-way write-back-locking-C L1 PIPT Data cache
346: cpu1: 2048KB/64B 16-way write-through L2 PIPT Unified cache
347: vfp1 at cpu1: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
348: cpu2: 2316 MHz Cortex-A15 r3p3 (Cortex V7A core)
349: cpu2: DC enabled IC enabled WB disabled EABT branch prediction enabled
350: cpu2: 32KB/64B 2-way L1 PIPT Instruction cache
351: cpu2: 32KB/64B 2-way write-back-locking-C L1 PIPT Data cache
352: cpu2: 2048KB/64B 16-way write-through L2 PIPT Unified cache
353: vfp2 at cpu2: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
354: uhub0 at usb0: Tegra EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
355: uhub0: 1 port with 1 removable, self powered
356: ahcisata0 port 0: device present, speed: 3.0Gb/s
357: uhub1 at usb1: Tegra EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
358: uhub1: 1 port with 1 removable, self powered
359: sdhc1: cmd timeout error
360: IPsec: Initialized Security Association Processing.
361: ld0 at sdmmc1: <0x45:0x0100:SEM16G:0x00:0x0301ff34:0x000>
362: ld0: 15028 MB, 7633 cyl, 64 head, 63 sec, 512 bytes/sect x 30777344 sectors
363: ld0: GPT GUID: a81e231f-7b1c-c564-1473-5ac55e4b7963
364: dk0 at ld0: "APP", 29360128 blocks at 94208, type: <unknown>
365: dk1 at ld0: "DTB", 8192 blocks at 29454336, type: <unknown>
366: ld1 at sdmmc0dk2 at ld0: "EFI", 131072 blocks at 29462528, type: <unknown>
367: : <0x27:0x5048:SD64G:0x30:0x01ce4def:0x0dc>
368: dk3 at ld0: "USP", 8192 blocks at 29593600, type: <unknown>
369: dk4 at ld0: "TP1", 8192 blocks at 29601792, type: <unknown>
370: dk5 at ld0: "TP2", 8192 blocks at 29609984, type: <unknown>
371: dk6 at ld0: "TP3", 8192 blocks at 29618176, type: <unknown>
372: dk7 at ld0: "WB0", 4096 blocks at 29626368, type: <unknown>
373: dk8 at ld0: "UDA", 1142784 blocks at 29630464, type: <unknown>
374: ld0: 8-bit width, HS200, 200.000 MHz
375: ld1: 59504 MB, 7585 cyl, 255 head, 63 sec, 512 bytes/sect x 121864192 sectors
376: ld1: 4-bit width, SDR104, 204.000 MHz
377: wd0 at atabus0 drive 0
378: wd0: <OCZ-AGILITY3>
379: wd0: drive supports 16-sector PIO transfers, LBA48 addressing
380: wd0: 111 GB, 232581 cyl, 16 head, 63 sec, 512 bytes/sect x 234441648 sectors
381: wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
382: wd0(ahcisata0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) (using DMA)
383: uhidev0 at uhub1 port 1 configuration 1 interface 0
384: uhidev0: Logitech USB Receiver, rev 2.00/29.00, addr 2, iclass 3/1
385: ukbd0 at uhidev0: 8 modifier keys, 6 key codes
386: wskbd0 at ukbd0 mux 1
387: wskbd0: connecting to wsdisplay0
388: uhidev1 at uhub1 port 1 configuration 1 interface 1
389: uhidev1: Logitech USB Receiver, rev 2.00/29.00, addr 2, iclass 3/1
390: uhidev1: 17 report ids
391: ums0 at uhidev1 reportid 2: 16 buttons, W and Z dirs
392: wsmouse0 at ums0 mux 0
393: uhid0 at uhidev1 reportid 3: input=4, output=0, feature=0
394: uhid1 at uhidev1 reportid 4: input=1, output=0, feature=0
395: uhid2 at uhidev1 reportid 16: input=6, output=6, feature=0
396: uhid3 at uhidev1 reportid 17: input=19, output=19, feature=0
397: boot device: wd0
398: root on wd0a dumps on wd0b
399: root file system type: ffs
400: kern.module.path=/stand/evbarm/7.99.23/modules
401: WARNING: preposterous TOD clock time
402: WARNING: using filesystem time
403: WARNING: CHECK AND RESET THE DATE!
404: """]]
405:
406: # Links
407:
408: - [NVIDIA Jetson TK1 development kit](https://developer.nvidia.com/jetson-tk1)
409: - [Hardware documentation](https://developer.nvidia.com/hardware-design-and-development)
410: - [Linux For Tegra](https://developer.nvidia.com/linux-tegra)
411: - [Device Tree](http://www.devicetree.org)
412:
413: .
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