Dev/OPi/OPiZero/From Scratch
u-boot
Grab the sources
git clone git://git.denx.de/u-boot.git cd u-boot git checkout v2019.07
Compile
make CROSS_COMPILE=arm-linux-gnueabihf- orangepi_zero_defconfig make -j8 CROSS_COMPILE=arm-linux-gnueabihf-
Use
Erase the first Mo of the SD card while keeping the partition table:
dd if=/dev/zero of=${card} bs=1k count=1023 seek=1
Copy uboot images to the SD card:
dd if=u-boot-sunxi-with-spl.bin of=${card} bs=1024 seek=8
Create file "boot.cmd" :
# default values
setenv kernel_image "Image-5.3.0-ed3l"
setenv rootdev "/dev/mmcblk0p2"
setenv fdtfile "sun50i-h6-orangepi-3.dtb"
setenv consoleargs "console=ttyS0,115200"
setenv usbstoragequirks "0x2537:0x1066:u,0x2537:0x1068:u"
# Print boot source
itest.b *0x10028 == 0x00 && echo "U-boot loaded from SD"
itest.b *0x10028 == 0x02 && echo "U-boot loaded from eMMC or secondary SD"
itest.b *0x10028 == 0x03 && echo "U-boot loaded from SPI"
echo "Boot script loaded from ${devtype}"
setenv bootargs "${consoleargs} root=${rootdev} rw rootwait usb-storage.quirks=${usbstoragequirks} quiet"
# setenv bootargs "${consoleargs} root=${rootdev} rw rootwait ignore_loglevel console_loglevel=4"
load ${devtype} ${devnum} ${fdt_addr_r} ${fdtfile}
load ${devtype} ${devnum} ${kernel_addr_r} ${kernel_image}
booti ${kernel_addr_r} - ${fdt_addr_r}
# Recompile with:
# mkimage -C none -A arm -T script -d boot.cmd boot.scr
Convert boot.cmd to boot.scr using mkimage :
mkimage -C none -A arm -T script -d boot.cmd boot.scr
Put boot.scr file in the first partition of the SD card (with the kernel and the device tree)
Linux Kernel
Grab the sources
- Kernel 5.2.0-rc5 from kernel.org
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
- Configuration file : http://www.nathael.org/Data/Devel/OPiZero/config_5.2.0-rc5_2019-08-04-ed3l
Compile
mkdir -p Build/linux cd linux make ARCH=arm -j8 O=../Build/linux/ sunxi_defconfig make ARCH=arm -j8 O=../Build/linux/ CROSS_COMPILE=arm-linux-gnueabihf- make ARCH=arm -j8 O=../Build/linux/ CROSS_COMPILE=arm-linux-gnueabihf- dtbs make ARCH=arm -j8 O=../Build/linux/ CROSS_COMPILE=arm-linux-gnueabihf- modules_install INSTALL_MOD_PATH=../Mods
Use
- Linux Kernel
Compilation result is in arch/arm64/boot/Image
- Device tree
Use the sun50i-h6-orangepi-3.dtb device-tree (found in arch/arm64/boot/dts/allwinner/)
- Modules
If the compilation has been performed using the above command lines you should have a directory "Build/Mods/lib/modules/***" (*** = name of the kernel you just compiled)
You must copy the whole directory (not only the content) on the SD card, in the partition holding the root filesystem (rootfs), in the /lib/modules/ directory without changing the name.
SD Card creation
Original information from linux-sunxi wiki
SD card architecture
| start | sector | size | usage |
|---|---|---|---|
| 0KB | 0 | 8KB | Unused, available for an MBR or (limited) GPT partition table |
| 8KB | 16 | 32KB | Initial SPL loader |
| 40KB | 80 | - | U-Boot proper |
Typically partitions start at 1MB (which is the default setting of most partitioning tools), but there is no hard requirement for this, so U-Boot can grow bigger than 984KB, if needed.
The 8KB offset is dictated by the BROM, it will check for a valid eGON/TOC0 header at this location. The 40KB offset for U-Boot proper is the default U-Boot setting and can be changed at build time using the CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR configuration variable.
Cleaning
Erase the first Mo of the SD card while keeping the partition table:
dd if=/dev/zero of=${card} bs=1k count=1023 seek=1
(Use count=1024 and remove "seek" option to also erase the partition table)
Bootloader
Copy uboot images (u-boot-sunxi-with-spl.bin, found in u-boot main directory after compilation) to the SD card:
dd if=u-boot-sunxi-with-spl.bin of=${card} bs=1024 seek=8
The file "u-boot-sunxi-with-spl.bin" seems to be an aggregate of spl/u-boot-spl.bin and u-boot.bin
First partition
The first partition must start at +1Mo, and be a few Mo (50 Mo should be OK) and be formated using ext2/3/4
Place the files "zImage", "sun8i-h2-plus-orangepi-zero.dtb" and "boot.scr" on the first partition.
Second partition
The second partition must be formated using ext4 and starts right after the first one. It can take all the remaining size unless you have other specific needs.
This partition holds the root filesystem (rootfs).
Rootfs
This board uses an ARM processor with hardfloat support, thus the root filesystem should be built using "arm-linux-gnueabihf-" cross-toolchain or use the armhf architecture for Devuan or other Debian based distribution.
Refer to the rootfs creation page for more information. You should find a base Devuan rootfs here : rootfs_devuan_ceres_***.tar.bz2.