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products:sbc:vim4:development:boot-sequence

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products:sbc:vim4:development:boot-sequence [2022/07/26 02:29]
hyphop [VIM4 OS Boot Priority]
products:sbc:vim4:development:boot-sequence [2022/08/22 03:07]
hyphop old revision restored (2022/08/22 14:00)
Line 1: Line 1:
 +~~tag>VIM4 boot-sequence MCU~~
 +
 ====== VIM4 OS Boot Priority ====== ====== VIM4 OS Boot Priority ======
  
-VIM4 is capable of booting from the following devices: ''eMMC'',  ''TF Card'', ''SPI Flash''+VIM4 have possibility boot-up from : ''eMMC'', ''TF Card'', ''SPI-Flash''
  
 <WRAP info > <WRAP info >
-We talking there only about 1st stage SOC boot, next second stage os loading possible for any other diveices like USB storagesNVME etc ...  +We talking there only about 1st stage SOC boot,  
 +next second stage OS loading possible for any other devices like USB storage's, 
 +NVMe etc ... and depends from ''u-boot'' configurations
 </WRAP> </WRAP>
- 
-/* not sure its needed ? 
-The OS image can be flased into the ''eMMC'', ''TF Card'' or ''SPI Flash''. 
-*/ 
  
 ===== Default boot priority ===== ===== Default boot priority =====
  
-  - TF Card+  - TF-Card <wrap important> higher priority</wrap>
   - eMMC   - eMMC
-  - SPI Flash+  - SPI-Flash
  
 +===== 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
 +
 +Change boot priority to: ''TF-Card => eMMC => SPI-Flash''
 +
 +```shell
 +kvim4# kbi bootmode w emmc
 +```
 +
 +Change boot priority to: ''TF-Card => SPI-Flash => eMMC''
 +
 +```shell
 +kvim4# kbi bootmode w spi
 +```
  
 <WRAP important > <WRAP important >
-''TF Card'' will always take the highest priority. +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> </WRAP>
  
  
-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.+===== Linux command-line usage =====
  
-  * Setting the priority of ''eMMC'' above ''SPI Flash''+```sh 
 +i2cset -f -y 6 0x18 0x20 1 # setup default eMMC boot-mode 
 +```
  
-```shell +```sh 
-kvim4kbi bootmode w emmc+i2cset -f -y 6 0x18 0x20 0 setup SPI-flash boot-mode
 ``` ```
  
-Then the boot priority will become:+==== Hot apply setting changes via mcu reboot ====
  
-  - TF Card +```sh 
-  eMMC +i2cset -f -y 6 0x18 0x91 1 
-  - SPI Flash+```
  
-  * Setting the priority of ''SPI Flash'' above ''eMMC'' 
  
-```shell +===== OOWOW boot special shortcut ===== 
-kvim4# kbi bootmode w spi + 
-```+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>
  
-Then the boot priority will become: 
  
-  - TF Card 
-  - SPI Flash 
-  - eMMC 
Last modified: 2022/08/22 03:33 by hyphop