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Cross compile in Gentoo to obtain custom Raspberry firmware
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redeltaglio
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Joined: 04 Apr 2018
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Location: Barcelona, Spain

PostPosted: Thu Apr 26, 2018 10:22 am    Post subject: Cross compile in Gentoo to obtain custom Raspberry firmware Reply with quote

https://steemit.com/gentoo/@npna/cross-compile-in-gentoo-to-obtain-a-custom-raspberry-pi-3-firmware

Hello nice people. I'm Riccardo Giuntoli writing from Barcelona, Spain.
Thankfully to the hardwork of the Gentoo user [profile=sahaki]sahaki[/profile] i've just finished to write this guide that will guide the reader to a detailed step by step work dedicated to the build of a correct environment useful to obtain an arm64 cross compile Gentoo workstation.
The final goal of this serie of guides will be the publication of a mantained ebuild of the powerful Pi-HOLE for the arm64 architecture under our favorite Linux distribution, Gentoo.
Any comments?

Nice Regards,

RG
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NeddySeagoon
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Joined: 05 Jul 2003
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PostPosted: Thu Apr 26, 2018 6:01 pm    Post subject: Reply with quote

redeltaglio,

The Gentoo arm64 offering is still experimental.
Most of the stable packages are only stable so that we can have auto builds produce a stage3 tarball.

That means that there will not be many packages to install.
~arm64 mostly works.
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NeddySeagoon
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PostPosted: Thu Apr 26, 2018 6:05 pm    Post subject: Reply with quote

Moved from Documentation, Tips & Tricks to Gentoo on ARM.
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NeddySeagoon

Computer users fall into two groups:-
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Hu
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PostPosted: Fri Apr 27, 2018 2:09 am    Post subject: Re: Cross compile in Gentoo to obtain custom Raspberry firmw Reply with quote

redeltaglio wrote:
Thankfully to the hardwork of the Gentoo user [profile=sahaki]sahaki[/profile]
Profile tags take the user's ID number, not the display name. Display names can be changed, but ID numbers are stable. You can get the user's ID from the user's profile button.
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Sakaki
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Joined: 21 May 2014
Posts: 196

PostPosted: Tue May 01, 2018 6:25 pm    Post subject: Reply with quote

redeltaglio,

looks good ^-^

Some random points:

Does the Bluetooth adaptor come up correctly with this setup? I had to do an hciattach in a service (in addition to the firmware and kernel driver) to make it run.

Also, do you switch the CPU governor out of powersave (the default)? If not you will be running at 600MHz, not 1.2GHz/1.4GHz (see e.g. here).

If you use UUID-based naming in your /etc/fstab and /boot/cmdline.txt, you can also write the image to USB and boot from there (the RPi3B+ can boot from USB as shipped, the RPi3B needs a small one-time tweak).

You woudn't have to do much to make your instructions work fully on an RPi3B+ either (see this post). Just add /lib/firmware/brcm/brcmfmac43455-sdio.txt (you already have the DTB and are using the up-to-date 4.14.y kernel and firmware). Remember also this is dual-band so you need to do an "iw reg set <countrycode>" or equivalent.

Fun fact: if you:
Code:
# cp /mnt/piboot/bcm2710-rpi-3-b.dtb /mnt/piboot/bcm2709-rpi-2-b.dtb

your image should also boot on an RPi2v1.2.

Might be worth pointing people to the Gentoo Handbook at the end, for other tweaks to make.conf CFLAGS, localization etc.
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sakaki
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