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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 00:00]
ruby [Default option]
@@ 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 is capable of 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 ...
+This page mainly introduces about the first-stage SoC boot. The second-stage OS flashing is possible for USB storage and NVMe, which depends on ''u-boot'' configurations
 </WRAP>
-/* not sure its needed ?
+===== Default option =====
-The OS image can be flased into the ''eMMC'', ''TF Card'' or ''SPI Flash''.
-*/
-===== Default boot priority =====
+  - TF-Card <wrap important> top priority </wrap>
-  - TF Card
   - 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 >
-''TF Card'' will always take the highest priority.
+To make the booting priority swap take effect, you can [[#hot-apply-setting-changes-via-mcu-reboot|reboot via mcu]], or you can reboot the hardware by clicking the Reset button, or plugging the power supply or cable.
 </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
-kvim4# kbi 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

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