Re: RPi4 and support for RTC DS3231

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On 19 Oct 2023, at 17:28, Peter Robinson <pbrobinson@xxxxxxxxx> wrote:

You'll need to follow the general section for HAT support (it's
basically any HW that needs an overlay) and reboot and it should work:
https://fedoraproject.org/w/index.php?title=Architectures/ARM/Raspberry_Pi/HATs#General_configuration

That RTC is supported by the rtc-ds1307 driver.

I missed the link at the end of the config.txt  that was Fedora specific.
Maybe you could put that Fedora specific comment at the start of config.txt in a future release?

I have followed the steps and the RTC is working.
I would like to add a section on the RTC to the docs. If that is useful how do I go about doing that?

But I have lost the HDMI console. I can ssh into the system and it is otherwise working.

I see the boot sequence, u-boot, grub, last message on screen is the Fedoara kernel line
announcing its version. After a few seconds where I would expect to see systemd messages
instead the monitor goes into standby.

Do I need to change setting in config.txt to make the HDMI work?

Here is my config.txt:

$ cat /boot/efi/config.txt | grep -v -e '^#' -e '^$'
[pi4]
dtoverlay=upstream-pi4
arm_boost=1
dtoverlay=vc4-kms-v3d-pi4
dtoverlay=cma,cma-256
max_framebuffers=2
dtoverlay=i2c-rtc,ds3231
[cm4]
otg_mode=1
[all]
arm_64bit=1
kernel=rpi-u-boot.bin
dtoverlay=upstream
enable_uart=1
bootcode_delay=1
gpu_mem=32
start_x=1
camera_auto_detect=1
display_auto_detect=1
hdmi_ignore_cec_init=1

Barry

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