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--- products:sbc:edge2:hardware:boot-sequence [2022/08/29 02:33]
hyphop [SPL loader]
+++ products:sbc:edge2:hardware:boot-sequence [2022/08/29 02:55]
hyphop [OOWOW mode]
@@ Line 35: / Line 35: @@
 ```
+```log log spl-boot-oowow-mode-example.log
+U-Boot SPL board init
+U-Boot SPL 2017.09 (Aug 26 2022 - 15:50:37)
+MCU: bootmode: 1, oowow 1
+MCU: oowow 2
+board_boot_order: /chosen found, using spl_boot_device()
+!!! same-as-spl:
++++ /spi@fe2b0000/flash@1:
+!!! /mmc@fe2c0000:
+!!! /mmc@fe2e0000:
+!!! /spi@fe2b0000/flash@1:
+Trying to boot from MTD2 :: 0
+Trying fit image at 0x300 sector
+...
+Jumping to U-Boot(0x00200000) via ARM Trusted Firmware(0x00040000)
+...
+```
 ===== U-Boot loader =====
@@ Line 42: / Line 58: @@
 ==== U-Boot OS boot sequence ====
+<WRAP important >
+We discribe only about SPI-flash u-boot, for other custom U-boots which can stored at eMMC or SD its will be different
+</WRAP>
+OS booting follow by ''distro_bootcmd'' which use ''boot_targets'' priority for scanning bootable OS. Step by step scan all available storage's and partitions for [[#os-boot-configuration-extlinux-config]]
+```shell
+kedge2# printenv boot_targets
+boot_targets=usb0 mmc1 mmc0 pxe dhcp fail
+```
 WIP:
+==== OS boot configuration - extlinux config ====
 ===== OOWOW mode =====
+OOWOW mode can be activated by
+  * special on board short-cuts ''FUNCTION'' + ''RESET''
+  * under running OS via special [[#MCU-register-for-start-oowow]] - software way
 WIP:
+==== MCU register for start oowow ====
 ==== OOWOW special mode ====

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