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--- products:sbc:vim4:development:boot-sequence [2022/07/26 02:42]
hyphop [Linux shell usage]
+++ 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 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 >
-We talking there only about 1st stage SOC boot, next second stage os loading possible for any other diveices like USB storages, NVME etc ... and depends from ''u-boot''
+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>
-/* not sure its needed ?
-The OS image can be flased into the ''eMMC'', ''TF Card'' or ''SPI Flash''.
-*/
 ===== Default boot priority =====
-  - TF-Card <wrap important> TF-card will always take the highest priority. </wrap>
+  - TF-Card <wrap important> higher priority</wrap>
   - eMMC
   - 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
-You can also 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''
@@ Line 33: / Line 32: @@
 ```
-===== Linux shell usage =====
+<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
+i2cset -f -y 6 0x18 0x20 1 # setup default eMMC boot-mode
 ```
 ```sh
-i2cset -f -y 6 0x18 0x20 0
+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>

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