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--- products:sbc:edge2:hardware:boot-sequence [2022/08/29 02:32]
hyphop [SPL loader]
+++ products:sbc:edge2:hardware:boot-sequence [2022/08/29 03:06] (current)
hyphop [SPL loader]
@@ Line 13: / Line 13: @@
   * SPL-loader scan special areas for next [[#U-Boot-loader]] by ''SD'' => ''eMMC'' => ''SPI-FLash''
+<tabbox common logs>
-```log spl-boot.log
+```log spl-boot-example.log
 U-Boot SPL board init
 U-Boot SPL 2017.09 (Aug 26 2022 - 15:50:37)
-Failed to set cpub01
-Failed to set cpub23
-I2c2 speed: 100000Hz
 MCU: bootmode: 1, oowow 0
 board_boot_order: /chosen found, using spl_boot_device()
@@ Line 28: / Line 26: @@
 Trying to boot from MMC2 :: 0
 Card did not respond to voltage select!
-mmc_init: -95, time 12
-spl: mmc init failed with error: -95
 Trying to boot from MMC1 :: 1
 Trying fit image at 0x4000 sector
@@ Line 37: / Line 33: @@
 Trying to boot from MTD2 :: 2
 Trying fit image at 0x300 sector
+...
 ```
+<tabbox oowow-mode logs >
+```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)
+...
+```
+</tabbox>
@@ Line 46: / Line 64: @@
 ==== 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 ====
+Basic example:
+```conf extlinux/extlinux.conf
+menu background /logo.bmp
+LABEL Default
+  LINUX /Image
+  INITRD /initrd.img
+  FDTDIR /dtb
+  APPEND ${bootargs} earlycon=uart8250,mmio32,0xfeb50000 console=ttyFIQ0 console=tty0 irqchip.gicv3_pseudo_nmi=0 root=LABEL=ROOTFS rootflags=data=writeback rw rootfstype=ext4
+timeout  10
+default Default
+```
 ===== 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:
 ==== OOWOW special mode ====
@@ Line 58: / Line 108: @@
 ==== OOWOW rescue mode ====
+WIP:
+==== MCU register for start oowow ====
 WIP:

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