On 10/30/22 13:05, Sebastian Kuzminsky wrote:
On 10/25/22 12:03, Sebastian Kuzminsky wrote:
I'm using the 2022-08-08 bookworm rpi4 image from
<https://raspi.debian.net/tested-images/>, it's got linux-image-arm64
5.18.14-1 and raspi-firmware 1.20220331+ds-2.
It's working great, except I can't use the SPI devices.
SPI works on same hardware when running Raspbian's Buster image,
after running "dtparam spi=on" (or adding "dtparam=spi=on" to the
firmware config.txt file).
Raspbian Buster's dtparam program is not available on Debian Bookworm.
On Raspbian it comes from the libraspberrypi-bin deb, which is made
from the raspberrypi/firwmware git repo on github (the same repo that
supplies all the dtb files in /boot). dtparam and the other programs
there are provided in binary form (for armhf), not source :-(
I don't have this working yet but I've made a little bit of progress.
The Raspbian Buster armhf binaries can be made to run on Debian
Bookworm arm64 with a little bit of coaxing, but they rely on kernel
features that are not in Bookworm's arm64 kernel, so that's a bit of a
dead end.
I then tried editing the dtb directly:
I "decompiled" the dtb `/boot/firmware/bcm2711-rpi-4-b.dtb` into an
editable dts with `dtc -I dtb -O dts $DTB > $DTS`.
I edited the dts to change the spi0 "status" field from "disabled" to
"ok".
I "compiled" the edited dts with `dtc -I dts -O dtb $DTS > $DTB`.
I then replaced the old dtb with the new one and rebooted.
The spi port seems to be present/enabled now: dmesg includes
"spi-bcm2835 fe204000.spi: no tx-dma configuration found - not using
dma mode", and /sys/bus/platform/drivers/spi-bcm2835/fe204000.spi
shows up.
But something is still wrong, there are still no /dev/spi* device
files like i get with Raspbian Buster.
So I'm closer, but I'm still missing something. The quest goes on!
Bored, I tried my make-debs script on the rpi4b running buster rasppios
today, but it bailed out with can't find
Documentation.de error.
Is there anything I can do?
Thanks Sebastian Kuzminsky. Take care & stay well.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
