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products:sbc:vim4:development:boot-sequence

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products:sbc:vim4:development:boot-sequence [2022/07/13 05:58]
nick 		products:sbc:vim4:development:boot-sequence [2022/08/22 03:07]
hyphop old revision restored (2022/08/22 14:00)
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 +~~tag>VIM4 boot-sequence MCU~~
 +
 ====== VIM4 OS Boot Priority ====== ====== VIM4 OS Boot Priority ======
  
-VIM4 is capable of booting from the following devices:+VIM4 have possibility boot-up from : ''eMMC'', ''TF Card'', ''SPI-Flash''
  
-  * eMMC +<WRAP info > 
-  * TF Card +We talking there only about 1st stage SOC boot,  
-  * SPI Flash+next second stage OS loading possible for any other devices like USB storage's, 
 +NVMe etc ... and depends from ''u-boot'' configurations 
 +</WRAP>
  
-The OS image can be flased into the ''eMMC'', ''TF Card'' or ''SPI Flash''.+===== Default boot priority =====
  
-The default boot priority is: +  - TF-Card <wrap important> higher priority</wrap>
- +
-  - TF Card+
   - eMMC   - eMMC
-  - SPI Flash+  - SPI-Flash
  
-You can also swap the boot priority of the ''eMMC'' and ''SPI Flash'' via the [[products:sbc:vim4:development:kbi|KBI(Khadas Boot Instructions)]], but the ''TF Card'' will always take the highest priority.+===== U-boot shell usage ===== 
 +We can swap the boot priority of the ''eMMC'' and ''SPI-Flash'' via the [[products:sbc:vim4:development:kbi|KBI(Khadas Boot Instructions)]] from u-boot shell
  
-  * Setting the priority of ''eMMC'' above ''SPI Flash''+Change boot priority to: ''TF-Card => eMMC => SPI-Flash''
  
 ```shell ```shell
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 ``` ```
  
-Then the boot priority will become: +Change boot priority to: ''TF-Card => SPI-Flash => eMMC''
- +
-  - TF Card +
-  - eMMC +
-  - SPI Flash +
- +
-  * Setting the priority of ''SPI Flash'' above ''eMMC''+
  
 ```shell ```shell
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 ``` ```
  
-Then the boot priority will become:+<WRAP important > 
 +for apply setting for next boot, need reboot device by ''RESET'' button or re-plug power cable or power-off device or [[#hot-apply-setting-changes-via-mcu-reboot|reboot via mcu]] 
 +</WRAP> 
 + 
 + 
 +===== Linux command-line usage ===== 
 + 
 +```sh 
 +i2cset -f -y 6 0x18 0x20 1 # setup default eMMC boot-mode 
 +``` 
 + 
 +```sh 
 +i2cset -f -y 6 0x18 0x20 0 # setup SPI-flash boot-mode 
 +``` 
 + 
 +==== Hot apply setting changes via mcu reboot ==== 
 + 
 +```sh 
 +i2cset -f -y 6 0x18 0x91 1 
 +``` 
 + 
 + 
 +===== OOWOW boot special shortcut ===== 
 + 
 +Hold ''FUNCTION'' and short press ''RESET'' to force boot [[:OOWOW]] service from SPI-flash, and skip other boot sources 
 + 
 +<WRAP important>TF-card slot must be empty</WRAP> 
  
-  - TF Card 
-  - SPI Flash 
-  - eMMC 
Last modified: 2022/08/22 03:33 by hyphop

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