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--- products:sbc:edge2:hardware:boot-sequence [2022/07/25 23:57]
hyphop created
+++ products:sbc:edge2:hardware:boot-sequence [2022/08/29 03:06] (current)
hyphop [SPL loader]
@@ Line 1: / Line 1: @@
-====== Edge2 boot-sequence ======
+~~tag>Edge2 boot-sequence~~
+====== Edge2 boot sequence ======
+Edge2 have advanced and flexible boot possibilities
+===== Common boot process =====
+[[#SPL-loader]] => [[#U-Boot-loader]] => [[#OOWOW-special-mode]] => [[#U-Boot-OS-boot-sequence]] => [[#OOWOW-rescue-mode]]
+===== SPL loader =====
+  * SPL-loader is a 1st boot-loader which can start from ''SPI-Flash'' => ''eMMC'' => ''SD'' card. By default its start from ''SPI-flash''.
+  * SPL-loader scan special areas for next [[#U-Boot-loader]] by ''SD'' => ''eMMC'' => ''SPI-FLash''
+<tabbox common logs>
+```log spl-boot-example.log
+U-Boot SPL board init
+U-Boot SPL 2017.09 (Aug 26 2022 - 15:50:37)
+MCU: bootmode: 1, oowow 0
+board_boot_order: /chosen found, using spl_boot_device()
+!!! same-as-spl:
+!!! /mmc@fe2c0000:
+!!! /mmc@fe2e0000:
+!!! /spi@fe2b0000/flash@1:
+Trying to boot from MMC2 :: 0
+Card did not respond to voltage select!
+Trying to boot from MMC1 :: 1
+Trying fit image at 0x4000 sector
+Not fit magic
+Trying fit image at 0x5000 sector
+Not fit magic
+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>
+===== U-Boot loader =====
+WIP:
+==== 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 ====
+WIP:
+==== OOWOW rescue mode ====
+WIP:
+==== MCU register for start oowow ====
 WIP:

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