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--- products:sbc:vim4:development:boot-sequence [2022/06/30 03:56]
hyphop
+++ products:sbc:vim4:development:boot-sequence [2022/08/22 03:33] (current)
hyphop old revision restored (2022/08/22 14:54)
@@ Line 1: / Line 1: @@
-====== Boot Sequence ======
+~~tag>VIM4 boot-sequence MCU~~
+====== VIM4 OS Boot Priority ======
+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 devices like USB storage's,
+NVMe etc ... and depends from ''u-boot'' configurations
+</WRAP>
+===== Default boot priority =====
+  - TF-Card <wrap important>always highest priority</wrap>
+  - eMMC
+  - SPI-Flash
+===== U-Boot shell usage =====
+You can change 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 >
+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>

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