View source for SiFive Freedom U740

{{Subarch
|CPU Family=64-bit RISC-V Processors
|release date=June 1, 2022
|releases=next
|subarch=sifive-fu740
|arch=riscv-64bit
|Description=This subarch supports the RISC-V SiFive Freedom U740 processor, featured on the [https://www.sifive.com/boards/hifive-unmatched HiFive Unmatched] board.
}}

== What you need ==

* The [https://www.sifive.com/boards/hifive-unmatched Hifive Unmatched], with an M.2 disk and a GPU installed (see the [https://sifive.cdn.prismic.io/sifive/65937c64-c6ca-4bc7-80d1-e830a895636a_hifive-unmatched-getting-started-guide-v1p4.pdf Getting started guide] about qualified options)
* A microSD card loaded with the [https://github.com/sifive/freedom-u-sdk Freedom U SDK], preferably the CLI version (for example using [https://github.com/sifive/freedom-u-sdk/releases/download/2022.04.00/demo-coreip-cli-unmatched-2022.04.00.rootfs.wic.xz this] disk image).

== Installation ==

* Insert the prepared microSD card and boot into the Linux loaded on it.
* Follow the usual [https://www.funtoo.org/Install/Introduction Funtoo installation process] to prepare the M.2 disk ({{c|/dev/nvme0n1}}), but don't create a separate boot partition, as you're going to be using the one already present on the microSD card ({{c|/dev/mmcblk0p3}}).
* Mount your partitions under {{c|/mnt/funtoo}}, it should look similar to this (ignore additional rows):
{{console|body=
###i## lsblk
mmcblk0     179:0    0    30G  0 disk 
|-mmcblk0p1 179:1    0     1M  0 part 
|-mmcblk0p2 179:2    0     4M  0 part 
|-mmcblk0p3 179:3    0   130M  0 part /mnt/funtoo/boot
`-mmcblk0p4 179:4    0   6.5G  0 part 
nvme0n1     259:0    0 931.5G  0 disk 
`-nvme0n1p1 259:1    0 931.5G  0 part /mnt/funtoo
}}
* Finish the usual normal Funtoo installation until you need to configure booting (remember to add the microSD card boot partition to your {{c|fstab}}
* Add Funtoo to the U-Boot config on the microSD card:
{{file|name=/mnt/funtoo/boot/extlinux/extlinux.conf|body=
default Funtoo

label OpenEmbedded-SiFive-HiFive-Unmatched
   kernel /Image.gz-initramfs-unmatched.bin
   fdt /hifive-unmatched-a00.dtb
   append root=/dev/mmcblk0p4 rootfstype=ext4 rootwait console=ttySIF0,115200 earlycon

label Funtoo
   kernel /Image.gz-initramfs-unmatched.bin
   fdt /hifive-unmatched-a00.dtb
   append root=/dev/nvme0n1p1 rootfstype=ext4 rootwait console=ttySIF0,115200 earlycon
}}
* Rebooting should load your Funtoo installation with the official Freedom U SDK kernel

{{note|'''Self-compiled kernel''': Build the kernel into a single (EFI) image (with an embedded initramfs, should you need one), then install that to the microSD card's boot partition, along with the {{c|hifive-unmatched-a00.dtb}} file from your kernel's source directory. Adjust the {{c|kernel}} and {{c|fdt}} entries from {{c|/boot/extlinux/extlinux.conf}} accordingly.}}