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en:u3_tips [2015/01/29 17:07]
charles.park [How to change HDMI output resolution]
en:u3_tips [2015/01/29 17:27] (current)
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 +====== Tips for ODROID-U3 ======
 +This page introduce you an useful tips to use **ODROID-U3**.
 +====== How to change HDMI output resolution ======
 +**ODROID-U3** can support various resolution on HDMI output, you can select one of supported resolutions for your display (LCD monitor or TV).
 +<WRAP left round tip 100%>
 +Please make sure the resolution you select can be supported by your display before you start. Otherwise you would be hard to recover the resolution again.
 +<WRAP left round box 100%>
 +Supported resolutions
 +  - 1920x1080 (1080p)
 +  - 1280x720 (720p)
 +===== Android =====
 +We provide you a simple but useful application,​ **ODROID Utility**. This helps you to change the resolution by menu as below and you can select one of them for your display. Once you select one, click the button **Apply and Reboot**. Then your **ODROID-U3** will restart with new resolution.
 +===== Linux / Ubuntu =====
 +Coming soon...
 +===== Lowlevel Change =====
 +This section introduce you to change the resolution by manual, this would be helpful if you are failure to change the resolution and not able to sett the face of **ODROID-C1**.
 +The fact what initiate the resolution is from **U-boot** and the environment key is **hdmimode**. Probably your U-boot would have the one like this by default.
 +odroidc#​print hdmimode
 +This will be passed to Linux kernel by **bootargs** just before Linux kernel is started. Here is the default value of **bootcmd** which starts Linux kernel. As you see, **hdmimode** is passing as boot argument.
 +odroidc#​print bootcmd
 +bootcmd=cfgload;​setenv bootargs root=/​dev/​mmcblk0p2 rw console=ttyS0,​115200n8 no_console_suspend vd
 +accfg=${vdac_config} logo=osd1,​loaded,​${fb_addr},​${outputmode},​full hdmimode=${hdmimode} cvbsmode=$
 +{cvbsmode} hdmitx=${cecconfig} androidboot.serialno=${fbt_id#​};​ movi read boot 0 0x12000000;​movi re
 +ad dtb 0 0x12800000;​bootm 0x12000000 - 0x12800000
 +==== How to change the value of hdmimode ====
 +There are three ways to change **hdmimode** to change the resolution, you can replace **1080p** with the other resolution you wish to change for your display.
 +=== U-boot ===
 +If you are able to get into U-boot, this is simply possible with 3 commands below. This will change the resolution value and restart the board.
 +setenv hdmimode 1080p
 +=== Android shell ===
 +If you are able to use **adb shell**, then you can do these command to change **hdmimode**. This will change the resolution value and restart the board as well.
 +# fw_setenv hdmimode 1080p
 +# reboot
 +=== Boot.ini ===
 +You also can boot with **boot.ini** without changing U-boot environment values permanently. If **boot.ini** is existed in FAT partition **ODROID-C1** does boot with it first, unless boot with default setting stored in U-boot environment. You can download the file below and copy into your FAT partition.
 +<file ini boot.ini>​
 +setenv hdmimode 1080p
 +setenv bootargs "​root=/​dev/​mmcblk0p2 rw console=ttyS0,​115200n8 no_console_suspend vdaccfg=${vdac_config} logo=osd1,​loaded,​${fb_addr},​${outputmode},​full hdmimode=${hdmimode} cvbsmode=${cvbsmode} hdmitx=${cecconfig} androidboot.serialno=${fbt_id#​}"​
 +setenv bootcmd "movi read boot 0 0x12000000; movi read dtb 0 0x12800000; bootm 0x12000000 - 0x12800000"​
 +run bootcmd
 +====== How to change U-boot configuration by BOOT.INI ======
 +In order to support easy boot loader setup, ODROID-C1 also support **boot.ini** as well as previous ODROID boards. So you can easily list up the commands what you want to executed in U-boot rather than the default. Here is the example to boot Ubuntu.
 +<file ini boot.ini>​
 +# Possible screen resolutions
 +# Uncomment only a single Line! The line with setenv written.
 +# At least one mode must be selected.
 +# setenv m "​vga" ​         # VGA 640x480
 +# setenv m "​480p" ​        # 480p 720x480
 +# setenv m "​576p" ​        # 576p 720x576
 +# setenv m "​800x480p60hz"​ # WVGA 800x480
 +# setenv m "​720p" ​        # 720p 1280x720
 +# setenv m "​800p" ​        # 800p(WXGA) 1280x800
 +# setenv m "​sxga" ​        # SXGA 1280x1024
 +setenv m "​1080p" ​       # 1080P 1920x1080
 +# setenv m "​1920x1200" ​   # 1920x1200
 +# HDMI/DVI Mode Configuration
 +setenv vout_mode "​hdmi"​
 +# setenv vout_mode "​dvi"​
 +# HDMI BPP Mode
 +setenv m_bpp "​32"​
 +# setenv m_bpp "​16"​
 +# UHS Card Configuration
 +# Uncomment the line below to __DISABLE__ UHS-1 MicroSD support
 +# This might break boot for some brand/​models of cards.
 +setenv disableuhs "​disableuhs"​
 +setenv bootargs "​console=ttyS0,​115200n8 root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro no_console_suspend vdaccfg=0xa000 logo=osd1,​loaded,​0x7900000,​720p,​full dmfc=3 cvbsmode=576cvbs hdmimode=${m} m_bpp=${m_bpp} vout=${vout_mode} ${disableuhs}"​
 +setenv bootcmd "​fatload mmc 0:1 0x21000000 uImage; fatload mmc 0:1 0x22000000 uInitrd; fatload mmc 0:1 0x21800000 meson8b_odroidc.dtb;​ bootm 0x21000000 0x22000000 0x21800000"​
 +run bootcmd
 +===== Board Identifier =====
 +This is the keyword to identify the correct **BOOT.INI** as per board. For **ODROID-C1**,​ any **BOOT.INI** must contain **ODROIDC-UBOOT-CONFIG** and other commands must be below this.
 +===== U-boot commands =====
 +You can describe multiple commands of U-boot from the next line of **ODROIDC-UBOOT-CONFIG**. The commands are only restricted within the commands enabled by the running U-boot.
en/u3_tips.txt ยท Last modified: 2015/01/29 17:27 by charles.park
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