IC697MEM713

IC697MEM713

IC697MEM713

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在之前的文章中，我们已经介绍了如何在 Linux中添加开机图片，实现定制化的开机Logo显示。或许你也已经注意到了，在设备刚上电启动的时候，LCD显示屏出现下面几种现象，花屏、黑屏或者显示内容不全等。这是因为，在基于 Linux 的设备上电启动时，其实经历了Bootloader → U-Boot→ Linux→ Root FS→ User App 这一系列的过程。LCD如果需要正常显示，其对应的显示控制器必须得到正确的配置。Linux启动会加载显示驱动，配置正确的显示参数。而在 Linux启动前，一般需要花费1到2秒的时间运行 U-Boot，Toradex默认的 U-Boot 在启动后会等待1秒中再加载 Linux内核，以便用户进入 U-Boot的命令行模式。在这一段时间内，ARM的显示控制器可能没有正确配置，所以出现了上述现象。下面我们将以Toradex Colibri iMX6/iMX7 为例介绍如何在 U-Boot中配置 RGB LCD液晶显示屏，使其上电后即可显示Logo图片。

2).配置

　　在 Linux中，DeviceTree能够为显示驱动提供正确的显示参数。如 Colibri iMX7计算机模块的其中一个 Device Tree配置文件imx7-colibri-eval-v3.dtsi， lcdif节点中native-mode指定了显示分辨率、时钟、时钟极性等参数。目前最新的 Linux BSP也支持从 cmdline的vidargs设置显示参数。而U-Boot虽然也支持 Device Tree，但是目前的版本中还没有启用，更多的是需要通过修改源代码以及U-Boot环境参数来配置显示输出。下面针对Colibri iMX6/iMX7两个平台进行说明。

a).ColibriiMX6

修改colibri_imx6.c文件，在structdisplay_info_tconstdisplays[] 中添加屏幕参数对应的成员，其中mode.name不能重复，U-Boot会根据该参数选择对应的参数配置。

REXROTH 1-812-130-870 NSPP 1812130870

REXROTH DB10-1-52/100/1​2 NSPP DB1015210012

REXROTH DB10-1-52/200/1​2 NSPP DB1015220012

R900773490 REXROTH

REXROTH 3-842-524-448 NSFP 3842524448

REXROTH 4WE10D40/0FCW11​0N9DA/V MNR R978909146 NEW

Rexroth VT 5012 Proportional Amplifier VT5012

NEW REXROTH R900577802 DIRECTIONAL CONTROL VALVE

REXROTH VTVSPA1-1-D1O NSPP VTVSPA11D1O

Rexroth DR 30-2-32/100Y/V/​5 Valve DR30232100YV5

REXROTH VT2000S42 NSPP VT2000S42

Rexroth VT 5011 S42 R1 Proportional Amp Card #10154

Rexroth Permanent Magnet Motors New

REXROTH 821-300-955 NSFP 821300955

REXROTH R117300012 NSFP R117300012

REXROTH SR085-4-3-V17 NSFP SR08543V17

REXROTH SF-L1.0012.060-​10.050 SERVO MOTOR

Rexroth Cylinder Pneumatic R978918666 300mm 160bar NEW

NEW Bosch Rexroth DDL Fieldbus Input Module 3375002000

New Bosch Rexroth Indramat VCM 2.0 Control Board

BOSCH REXROTH INDRAMAT ECODRIVE 03 - DKC06.3 INPUT CARD

Rexroth MNR:08213000972 Valve/Regulator

Rexroth Hydraulic Directional Valve D08 #Z2S22-1-5-51/V

Bosch Rexroth EC Motor Type 0 608 701 018 0608701018

REXROTH VT3024S34 PROP AMPLIFIER VT3024S34R1

REXROTH VE2/D-200 PNEUMATIC STOP GATE

Bosch/Rexroth .25 Gallon Buna Bladder Kit P# R978713134

REXROTH 523-607-081-0 CYLINDER

REXROTH BOSCH SERVODYN-D 1070086603-106 B-LP PM SMS

REXROTH H-3 AIR VALVE

Mannesmann Rexroth Amplifier VT5005 S16 R5 engl #4 NEW

Rexroth 4WE10D31/CG24N ZN, Valve, 24vdc coil NEW

Rexroth Amplifier Control Card Board VT VT5005-17b

Rexroth MSM040B

Rexroth Poppet SEW directional hydraulic control valve

Rexroth 4WE 10 4WE10J33/CG24N9​K4 hydraulic valve NEW

Bosch Rexroth Hydraulic Directional Valve

Rexroth Hydraulic Actuator Assembly R901101462

Rexroth Hydraulic Valve LF150DBUZBZ-63/​315A/100V12

Rexroth Pressure Regulator Valve zdr6db2-43/210y​m salva

REXROTH VALVE 4 WRE 10 E32-10/2424/M

REXROTH BALL NUT P/N MNR: R151249014

Rexroth Proportional Amplifier Card in Holder #VT500354

MANNESMANN REXROTH HYDRAULIC PISTON LC50 LC50DB0E6X NEW

REXROTH STAR LINEAR BEARINGS 1622-213-214-10 W RAIL

REXROTH INDRAMAT DSS02.1 SERCOS INTERFACE REFURBISHED

REXROTH 1070076509 SF-A2.0041.030-​10.050 SERVO

REXROTH 1070076709 SF-A4.0125.030-​14.050 SERVO

REXROTH PROP AMPLIFIER VT 5002-25/R5E NEW IN BOX

Mannesmann Rexroth 4WE 10G31/CG24N Hydraulic Valve

REXROTH HYDRAULIC VALVE 5-3WE10A32 DIRECTIONAL 96V

Mannesmann Rexroth 4WEG61/EW110N9D​AL

REXROTH VT 5003S40 R1 PROP. AMPLIFIER GOOD TAKEOUT

NEW REXROTH VT-VRPA1-50-1X

REXROTH VT-3014 NSPP VT3014

REXROTH VT-2000K42 USPP VT2000K42

REXROTH PROPORTIONAL DIRECTIONAL VALVE

NEW - Clark Lift Truck Pump P/N 2743553 by Rexroth

REXROTH PRECISION ROLLED THREAD BALL SCREW 3465770-0000

REXROTH 8-981-553-454 USPP 8981553454

Rexroth Valve 4WE10C40/CW110N​9DA. MNR R978908696. New

Mannesmann Rexroth 4WE 10 C32/CG24N9Z4 Valve Ref

Rexroth P Rotair pnuematic directional valve R431006581

Rexroth VT 5011 S 42 R1 Proportional Amplifier #26623

REXROTH R900938012 NSPP R900938012

REXROTH PERMANENT MAGNET MOTOR SF-A2.0020.030-​10.050

Rexroth Prop Amplifier VT3024534

REXROTH Prop Amplifier VT3006S35R5 #2965

REXROTH 0-38398-108 NSPP 038398108

REXROTH 3-842-503-783 NSPP 3842503783

REXROTH P6810-3180 USPP P68103180

REXROTH P-68180-3180 USPP P681803180

REXROTH R900961763 USPP R900961763

REXROTH VT2000S41 NSPP VT2000S41

REXROTH LINEAR BEARING CARTRIDGES, P/N: R166179410

REXROTH LINEAR BEARING CARTRIDGES, P/N: R182433110

REXROTH 8-981-553-451 USPP 8981553451

REXROTH VT2010S42 USPP VT2010S42

REXROTH 4WE10J33/CG24N9​K4 USPP 4WE10J33CG24N9K​4

Rexroth R185131310 Runner Block/Roller Rall NEW

REXROTH M-3-SED-6-UK13/​350-C-G24-N9K4 USPP M3SED6UK1335

REXROTH 041261-516 USPP 041261516

Rexroth 4WE10C40/CW11ON​9DA R900561288 Hydraulic Valve

REXROTH M-3-SED-6-CK13/​350-C-G24-N9K4 USPP M3SED6CK1335

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