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products:sbc:edge2:hardware:boot-sequence [2022/07/25 23:57] hyphop |
products:sbc:edge2:hardware:boot-sequence [2022/08/29 03:06] (current) hyphop [SPL loader] |
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- | ====== Edge2 boot-sequence ====== | + | ====== Edge2 boot sequence ====== |
+ | |||
+ | Edge2 have advanced and flexible boot possibilities | ||
+ | |||
+ | ===== Common boot process ===== | ||
+ | |||
+ | [[# | ||
+ | |||
+ | ===== SPL loader ===== | ||
+ | |||
+ | * SPL-loader is a 1st boot-loader which can start from '' | ||
+ | * SPL-loader scan special areas for next [[# | ||
+ | |||
+ | <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: | ||
+ | !!! same-as-spl: | ||
+ | !!! / | ||
+ | !!! / | ||
+ | !!! / | ||
+ | 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: | ||
+ | !!! same-as-spl: | ||
+ | +++ / | ||
+ | !!! / | ||
+ | !!! / | ||
+ | !!! / | ||
+ | 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 ===== | ||
+ | |||
+ | 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 | ||
+ | </ | ||
+ | |||
+ | OS booting follow by '' | ||
+ | |||
+ | ```shell | ||
+ | kedge2# printenv boot_targets | ||
+ | boot_targets=usb0 mmc1 mmc0 pxe dhcp fail | ||
+ | ``` | ||
+ | |||
+ | |||
+ | WIP: | ||
+ | |||
+ | ==== OS boot configuration - extlinux config ==== | ||
+ | |||
+ | Basic example: | ||
+ | |||
+ | ```conf extlinux/ | ||
+ | menu background /logo.bmp | ||
+ | LABEL Default | ||
+ | LINUX /Image | ||
+ | INITRD / | ||
+ | FDTDIR /dtb | ||
+ | APPEND ${bootargs} earlycon=uart8250, | ||
+ | timeout | ||
+ | default Default | ||
+ | ``` | ||
+ | |||
+ | ===== OOWOW mode ===== | ||
+ | |||
+ | OOWOW mode can be activated by | ||
+ | |||
+ | * special on board short-cuts '' | ||
+ | * under running OS via special [[# | ||
+ | WIP: | ||
+ | |||
+ | |||
+ | ==== OOWOW special mode ==== | ||
+ | |||
+ | WIP: | ||
+ | |||
+ | ==== OOWOW rescue mode ==== | ||
+ | |||
+ | WIP: | ||
+ | |||
+ | ==== MCU register for start oowow ==== | ||
WIP: | WIP: | ||