144 lines
5.3 KiB
Plaintext
144 lines
5.3 KiB
Plaintext
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U-boot for Odroid X2/U3
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========================
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1. Summary
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==========
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This is a quick instruction for setup Odroid boards based on Exynos4412.
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Board config: odroid_config
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2. Supported devices
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====================
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This U-BOOT config can be used on two boards:
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- Odroid U3
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- Odroid X2
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with CPU Exynos 4412 rev 2.0 and 2GB of RAM
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3. Boot sequence
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================
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iROM->BL1->(BL2 + TrustZone)->U-BOOT
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This version of U-BOOT doesn't implement SPL but it is required(BL2)
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and can be found in "boot.tar.gz" from here:
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http://dev.odroid.com/projects/4412boot/wiki/FrontPage?action=download&value=boot.tar.gz
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or here:
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http://odroid.in/guides/ubuntu-lfs/boot.tar.gz
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4. Boot media layout
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====================
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The table below shows SD/eMMC cards layout for U-boot.
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The block offset is starting from 0 and the block size is 512B.
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-------------------------------------
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| Binary | Block offset| part type |
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| name | SD | eMMC |(eMMC only)|
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-------------------------------------
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| Bl1 | 1 | 0 | 1 (boot) |
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| Bl2 | 31 | 30 | 1 (boot) |
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| U-boot | 63 | 62 | 1 (boot) |
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| Tzsw | 2111 | 2110 | 1 (boot) |
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| Uboot Env | 2500 | 2500 | 0 (user) |
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-------------------------------------
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5. Prepare the SD boot card - with SD card reader
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=================================================
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To prepare bootable media you need boot binaries provided by hardkernel.
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File "boot.tar.gz" (link in point 3.) contains:
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- E4412_S.bl1.HardKernel.bin
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- E4412_S.tzsw.signed.bin
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- bl2.signed.bin
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- sd_fusing.sh
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- u-boot.bin
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This is all you need to boot this board. But if you want to use your custom
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u-boot then you need to change u-boot.bin with your own u-boot binary*
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and run the script "sd_fusing.sh" - this script is valid only for SD card.
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*note:
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The proper binary file of current U-boot is u-boot-dtb.bin.
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quick steps for Linux:
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- extract boot.tar.gz
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- put any SD card into the SD reader
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- check the device with "dmesg"
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- run ./sd_fusing.sh /dev/sdX - where X is SD card device (but not a partition)
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Check if Hardkernel U-boot is booting, and next do the same with your U-boot.
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6. Prepare the eMMC boot card
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with a eMMC card reader (boot from eMMC card slot)
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=====================================================
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To boot the device from the eMMC slot you should use a special card reader
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which supports eMMC partiion switch. All of the boot binaries are stored
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on the eMMC boot partition which is normally hidden.
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The "sd_fusing.sh" script can be used after updating offsets of binaries
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according to the table from point 4. Be sure that you are working on the right
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eMMC partition - its size is usually very small, about 1-4 MiB.
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7. Prepare the eMMC boot card
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with a SD card reader (boot from SD card slot)
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=================================================
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If you have an eMMC->microSD adapter you can prepare the card as in point 5.
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But then the device can boot only from the SD card slot.
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8. Prepare the boot media using Hardkernel U-boot
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=================================================
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You can update the U-boot to the custom one if you have an working bootloader
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delivered with the board on a eMMC/SD card. Then follow the steps:
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- install the android fastboot tool
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- connect a micro usb cable to the board
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- on the U-boot prompt, run command: fastboot (as a root)
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- on the host, run command: "fastboot flash bootloader u-boot-dtb.bin"
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- the custom U-boot should start after the board resets.
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9. Partition layout
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====================
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Default U-boot environment is setup for fixed partiion layout.
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Partition table: MSDOS. Disk layout and files as listed in the table below.
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----- ------ ------ ------ -------- ---------------------------------
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| Num | Name | FS | Size | Offset | Reguired files |
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| | | Type | MiB | MiB | |
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----- ------ ------ ------ -------- ---------------------------------
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| 1 | BOOT | fat | 100 | 2 | kernel, fdt** |
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| 2 | ROOT | ext4 | - | | any Linux system |
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----- ------ ------ ------ -------- ---------------------------------
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**note:
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Supported fdt files are:
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- exynos4412-odroidx2.dtb
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- exynos4412-odroidu3.dtb
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Supported kernel files are:
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- Image.itb
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- zImage
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- uImage
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The default environmental variable "dfu_alt_info" is set* for above layout.
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Each partition size is just an example, dfu_alt_info tries init two partitions.
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The size of each is not important.
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*note:
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$dfu_alt_info is set on a boot time and it is concatenated using two variables:
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- $dfu_alt_boot(set dynamically)
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- $dfu_alt_system(from current env).
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To add any changes to dfu_alt_info - please modify $dfu_alt_system only.
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Changes are visible after board reset.
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10. The environment and booting the kernel
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==========================================
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There are three macros defined in config for various boot options:
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Two for both, kernel with device tree support and also without it:
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- boot_uimg - load uImage
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- boot_zimg - load zImage
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If proper fdt file exists then it will be automatically loaded,
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so for old kernel types, please remove fdt file from boot partition.
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The third boot option for multi image support (more info: doc/uImage.FIT/)
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- boot_fit - for binary file: "Image.itb"
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Default boot command: "autoboot"
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And the boot sequence is:
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- boot_fit - if "Image.itb" exists
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- boot_zimg - if "zImage" exists
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- boot_uimg - if "uImage" exists
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