§2023-08-26

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Creating an initramfs (initial ramdisk) is an essential step in the process of setting up a Linux system, as it contains essential files and drivers required to boot the system before the actual root filesystem is mounted. Here's how you can create an initramfs for your Gentoo installation on the Odroid-N2:

Generate the Initramfs:

To create the initramfs, you'll need to use the genkernel tool provided by Gentoo. This tool simplifies the process of generating an initramfs with the necessary modules and tools. Here's how to use it:

Install genkernel if it's not already installed:

(chroot) n2Mnjaro / # emerge --ask sys-kernel/genkernel

 * IMPORTANT: 10 news items need reading for repository 'gentoo'.
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These are the packages that would be merged, in order:

Calculating dependencies... done!
Dependency resolution took 8.38 s.


!!! All ebuilds that could satisfy "sys-kernel/linux-firmware" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-kernel/linux-firmware-99999999::gentoo (masked by: || ( ) linux-fw-redistributable license(s), missing keyword)
A copy of the 'linux-fw-redistributable' license is located at '/usr/portage/licenses/linux-fw-redistributable'.

- sys-kernel/linux-firmware-20230804::gentoo (masked by: || ( ) linux-fw-redistributable license(s))
- sys-kernel/linux-firmware-20230625_p20230724::gentoo (masked by: || ( ) linux-fw-redistributable license(s))
- sys-kernel/linux-firmware-20230625_p20230707::gentoo (masked by: || ( ) linux-fw-redistributable license(s))
- sys-kernel/linux-firmware-20230515::gentoo (masked by: || ( ) linux-fw-redistributable license(s))

(dependency required by "sys-kernel/genkernel-4.3.5::gentoo[firmware]" [ebuild])
(dependency required by "sys-kernel/genkernel" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.

# review license
(chroot) n2Mnjaro / # less /usr/portage/licenses/linux-fw-redistributable
(chroot) n2Mnjaro / # nano  /usr/portage/licenses/linux-fw-redistributable
(chroot) n2Mnjaro / # emerge --sync


emerge --ask sys-kernel/dracut
(chroot) n2Mnjaro /usr/src/linux-6.1.46-gentoo # dracut --kver 6.1.46-gentoo --force /boot/initramfs-linux.img
dracut: Executing: /usr/bin/dracut --kver 6.1.46-gentoo --force /boot/initramfs-linux.img
dracut: dracut module 'dash' will not be installed, because command 'dash' could not be found!
dracut: dracut module 'mksh' will not be installed, because command 'mksh' could not be found!
dracut: dracut module 'systemd-integritysetup' will not be installed, because command '/lib/systemd/systemd-integritysetup' could not be found!
dracut: dracut module 'systemd-integritysetup' will not be installed, because command '/lib/systemd/system-generators/systemd-integritysetup-generator' could not be found!
dracut: dracut module 'systemd-veritysetup' will not be installed, because command '/lib/systemd/systemd-veritysetup' could not be found!
dracut: dracut module 'systemd-veritysetup' will not be installed, because command '/lib/systemd/system-generators/systemd-veritysetup-generator' could not be found!
dracut: dracut module 'modsign' will not be installed, because command 'keyctl' could not be found!
dracut: dracut module 'busybox' will not be installed, because command 'busybox' could not be found!
dracut: dracut module 'dbus-broker' will not be installed, because command 'dbus-broker' could not be found!
dracut: dracut module 'rngd' will not be installed, because command 'rngd' could not be found!
dracut: dracut module 'connman' will not be installed, because command 'connmand' could not be found!
dracut: dracut module 'connman' will not be installed, because command 'connmanctl' could not be found!
dracut: dracut module 'connman' will not be installed, because command 'connmand-wait-online' could not be found!
dracut: dracut module 'network-legacy' will not be installed, because command 'dhclient' could not be found!
dracut: dracut module 'network-wicked' will not be installed, because command 'wicked' could not be found!
dracut: 62bluetooth: Could not find any command of '/usr/lib/bluetooth/bluetoothd /usr/libexec/bluetooth/bluetoothd'!
dracut: dracut module 'lvmmerge' will not be installed, because command 'lvm' could not be found!
dracut: dracut module 'lvmthinpool-monitor' will not be installed, because command 'lvm' could not be found!
dracut: dracut module 'btrfs' will not be installed, because command 'btrfs' could not be found!
dracut: 90crypt: Could not find any command of '/lib/systemd/systemd-cryptsetup cryptsetup'!
dracut: dracut module 'dm' will not be installed, because command 'dmsetup' could not be found!
dracut: dracut module 'dmraid' will not be installed, because command 'dmraid' could not be found!
dracut: dracut module 'dmsquash-live-ntfs' will not be installed, because command 'ntfs-3g' could not be found!
dracut: dracut module 'lvm' will not be installed, because command 'lvm' could not be found!
dracut: dracut module 'mdraid' will not be installed, because command 'mdadm' could not be found!
dracut: dracut module 'multipath' will not be installed, because command 'multipath' could not be found!
dracut: dracut module 'pcsc' will not be installed, because command 'pcscd' could not be found!
dracut: dracut module 'tpm2-tss' will not be installed, because command 'tpm2' could not be found!
dracut: dracut module 'cifs' will not be installed, because command 'mount.cifs' could not be found!
dracut: dracut module 'fcoe' will not be installed, because command 'dcbtool' could not be found!
dracut: dracut module 'fcoe' will not be installed, because command 'fipvlan' could not be found!
dracut: dracut module 'fcoe' will not be installed, because command 'lldpad' could not be found!
dracut: dracut module 'fcoe' will not be installed, because command 'fcoemon' could not be found!
dracut: dracut module 'fcoe' will not be installed, because command 'fcoeadm' could not be found!
dracut: dracut module 'fcoe-uefi' will not be installed, because command 'dcbtool' could not be found!
dracut: dracut module 'fcoe-uefi' will not be installed, because command 'fipvlan' could not be found!
dracut: dracut module 'fcoe-uefi' will not be installed, because command 'lldpad' could not be found!
dracut: dracut module 'iscsi' will not be installed, because command 'iscsi-iname' could not be found!
dracut: dracut module 'iscsi' will not be installed, because command 'iscsiadm' could not be found!
dracut: dracut module 'iscsi' will not be installed, because command 'iscsid' could not be found!
dracut: dracut module 'nbd' will not be installed, because command 'nbd-client' could not be found!
dracut: 95nfs: Could not find any command of 'rpcbind portmap'!
dracut: dracut module 'nvmf' will not be installed, because command 'nvme' could not be found!
dracut: dracut module 'biosdevname' will not be installed, because command 'biosdevname' could not be found!
dracut: dracut module 'memstrack' will not be installed, because command 'memstrack' could not be found!
dracut: memstrack is not available
dracut: If you need to use rd.memdebug>=4, please install memstrack and procps-ng
dracut: dracut module 'squash' will not be installed, because command 'mksquashfs' could not be found!
dracut: dracut module 'squash' will not be installed, because command 'unsquashfs' could not be found!
dracut: *** Including module: systemd ***
dracut: *** Including module: systemd-initrd ***
dracut: *** Including module: i18n ***
dracut: *** Including module: kernel-modules ***
dracut: *** Including module: kernel-modules-extra ***
dracut: *** Including module: nvdimm ***
dracut: *** Including module: qemu ***
dracut: *** Including module: qemu-net ***
dracut: *** Including module: lunmask ***
dracut: *** Including module: resume ***
dracut: *** Including module: rootfs-block ***
dracut: *** Including module: terminfo ***
dracut: *** Including module: udev-rules ***
dracut: Skipping udev rule: 40-redhat.rules
dracut: Skipping udev rule: 50-firmware.rules
dracut: Skipping udev rule: 50-udev.rules
dracut: Skipping udev rule: 91-permissions.rules
dracut: Skipping udev rule: 80-drivers-modprobe.rules
dracut: *** Including module: virtiofs ***
dracut: *** Including module: dracut-systemd ***
dracut: *** Including module: usrmount ***
dracut: *** Including module: base ***
dracut: *** Including module: fs-lib ***
dracut: *** Including module: shutdown ***
dracut: *** Including modules done ***
dracut: *** Installing kernel module dependencies ***
dracut: *** Installing kernel module dependencies done ***
dracut: *** Resolving executable dependencies ***
dracut: *** Resolving executable dependencies done ***
dracut: *** Hardlinking files ***
dracut: Mode:                     real
dracut: Method:                   sha256
dracut: Files:                    1129
dracut: Linked:                   4 files
dracut: Compared:                 0 xattrs
dracut: Compared:                 447 files
dracut: Saved:                    6.9 KiB
dracut: Duration:                 0.021432 seconds
dracut: *** Hardlinking files done ***
dracut: *** Generating early-microcode cpio image ***
dracut: *** Store current command line parameters ***
dracut: *** Stripping files ***
dracut: *** Stripping files done ***
dracut: *** Creating image file '/boot/initramfs-linux.img' ***
dracut: dracut: using auto-determined compression method 'gzip'
dracut: *** Creating initramfs image file '/boot/initramfs-linux.img' done ***

Generate the initramfs:

genkernel --install initramfs

The --install initramfs flag tells genkernel to generate and install the initramfs.

Configure Genkernel:

You can customize the behavior of genkernel by editing its configuration file. This can be useful if you need to include specific modules, filesystem support, or other options. The configuration file is located at /etc/genkernel.conf. Make sure it's configured according to your needs.

Configure Kernel Parameters:

Edit your bootloader configuration (like GRUB or U-Boot) to pass the initramfs image to the kernel at boot time. This is usually done by adding a line to your bootloader's configuration file that points to the generated initramfs image.

For example, if you're using U-Boot, you might add a line like this to your extlinux.conf:

javascript Copy code append initrd=/boot/initramfs-linux.img root=/dev/mmcblkXpY ro Replace /dev/mmcblkXpY with the actual partition where your root filesystem resides.

Reboot:

After generating the initramfs and updating your bootloader configuration, you should be ready to reboot your Odroid-N2. If everything is set up correctly, the kernel should load the initramfs, initialize essential drivers and modules, and then pivot to the actual root filesystem to continue the boot process.

Remember that the steps provided above are general guidelines. The specifics might vary based on your exact setup, bootloader, and any customizations you've made to your Gentoo installation. Always refer to the official Gentoo documentation, the documentation for your specific hardware (Odroid-N2), and any related resources for the most accurate and up-to-date instructions.

[root@n2Mnjaro src]# cp -v /boot/boot.ini /opt/xfs/home/alexlai/build/gentoo/src/root/boot/boot.ini
'/boot/boot.ini' -> '/opt/xfs/home/alexlai/build/gentoo/src/root/boot/boot.ini'

DROIDN2-UBOOT-CONFIG

# Default Console Device Setting
setenv condev "console=ttyAML0,115200n8"   # on both
# set bootlabel
setenv bootlabel "odroid-n2+ From Manjaro to Gentoo 2023-08-26"

# Boot Args
# setenv bootargs "root=PARTUUID=6319cfe2-02 rootwait rw ${condev} ${amlogic} no_console_suspend fsck.repair=yes net.ifnames=0 clk_ignore_unused quiet splash plymou>
setenv bootargs "root=PARTUUID=6319cfe2-02 rootwait rw ${condev} ${amlogic} no_console_suspend fsck.repair=yes net.ifnames=0 clk_ignore_unused plymouth.ignore-seria>

# Set load addresses
setenv dtb_loadaddr "0x20000000"
setenv loadaddr "0x1080000"
setenv initrd_loadaddr "0x4080000"

# Load kernel, dtb and initrd
load mmc ${devno}:1 ${loadaddr} /Image
load mmc ${devno}:1 ${dtb_loadaddr} /dtbs/amlogic/meson-g12b-odroid-n2.dtb
load mmc ${devno}:1 ${initrd_loadaddr} /initramfs-linux.uimg
#fdt addr ${dtb_loadaddr}

# boot
booti ${loadaddr} ${initrd_loadaddr} ${dtb_loadaddr}

mkimage -A arm -O linux -T ramdisk -C none -a 0x4080000 -e 0x1080000 -n "Initramfs Image" -d initramfs.img initramfs.img.uimg ChatGPT It seems like you want to create a uInitramfs image (uImage format) for your Odroid-N2, which is a format used by U-Boot, the bootloader commonly used on ARM systems. Here's how you can create a uInitramfs image from the regular initramfs image:

Create uInitramfs Image:

U-Boot uses the uImage format, which includes a 64-byte header. To create a uInitramfs image, you'll need to prepend the uImage header to your existing initramfs image. You can use the mkimage tool, which is usually included with U-Boot, to create the uInitramfs image.

First, navigate to the directory where your initramfs image is located.

cd /path/to/your/initramfs
mkimage -A arm64 -O linux -T ramdisk -C none -a 0x40000000 -e 0x40000000 -n "initramfs" -d initramfs-linux.img initramfs-linux.uimg
｀｀｀
Let's break down the options used in the command:

-A arm64: Specifies the architecture (ARM64 in this case).
-O linux: Specifies the operating system (Linux).
-T ramdisk: Specifies the image type as a ramdisk.
-C none: Specifies that no compression is used.
-a 0x40000000: Specifies the load address (adjust this as needed).
-e 0x40000000: Specifies the entry point address (same as load address).
-n "initramfs": Specifies the image name.
-d initramfs-linux.img: Specifies the input initramfs image.
initramfs-linux.uimg: Specifies the output uInitramfs image.
Copy uInitramfs Image:

After creating the uInitramfs image, copy it to the appropriate location on your boot partition. Depending on your bootloader and configuration, this could be a specific directory like /boot or any other directory that your bootloader searches for boot images.

Update Bootloader Configuration:

Similar to the steps mentioned in my previous response, you'll need to update your bootloader configuration to load the uInitramfs image. Adjust the extlinux.conf or equivalent file according to the format your bootloader uses.

javascript
Copy code
append initrd=/boot/initramfs-linux.uimg root=/dev/mmcblkXpY ro
Replace /dev/mmcblkXpY with the actual partition where your root filesystem resides.

Reboot:

After copying the uInitramfs image and updating the bootloader configuration, you should be ready to reboot your Odroid-N2. The U-Boot bootloader should now be able to load the uInitramfs image and pass control to the kernel to continue the boot process.

As always, ensure you're following the documentation provided by the Gentoo community and any specific instructions related to your hardware (Odroid-N2) and bootloader (U-Boot).






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