Re: Raspberry Pi 3B Distorted U-boot Display

On Sat, Feb 26, 2022 at 11:49 AM Archimedes Gaviola <
archimedes.gaviola@gmail.com> wrote:

> Hi,
>
> I've installed FreeBSD 13.0-RELEASE and 14.0-CURRENT successfully with
> Raspberry Pi 3B. However, upon U-boot initialization stage the monitor
> display is distorted as you can see here
> https://pasteboard.co/hxDjJHwxXPc8.jpg but when the FreeBSD kernel is
> loaded it displays normal as you can see here
> https://pasteboard.co/EkgcZdQSxjtA.jpg. I am thinking of lowering the
> resolution so I tried changing the HDMI configuration settings in the
> config.txt but it cannot be changed, it has no effect. It always stays on
> the default 1366x768 as what dmesg has detected. This behavior is also
> observed in 14.0-CURRENT.
>
> FreeBSD 13.0-RELEASE #0: Sat Feb 19 14:09:03 PST 2022
>     root@fbsd13:/usr/src/sys/arm64/compile/GENERIC arm64
> FreeBSD clang version 11.0.1 (git@github.com:llvm/llvm-project.git
> llvmorg-11.0.1-0-g43ff75f2c3fe)
> VT(efifb): resolution 1366x768
> ...
> fb0: <BCM2835 VT framebuffer driver> on simplebus0
> fb0: keeping existing fb bpp of 32
> fbd0 on fb0
> WARNING: Device "fb" is Giant locked and may be deleted before FreeBSD
> 14.0.
> VT: Replacing driver "efifb" with new "fb".
> fb0: 1366x768(1366x768@0,0) 32bpp
> fb0: fbswap: 1, pitch 5504, base 0x3e7f2000, screen_size 4227072
>
> freebsd@fbsd13:~ % cat /boot/msdos/config.txt
> [all]
> arm_64bit=1
> dtparam=audio=on,i2c_arm=on,spi=on
> dtoverlay=ds3231
> dtoverlay=mmc
> dtoverlay=disable-bt
> device_tree_address=0x4000
> kernel=u-boot.bin
> enable_uart=1
>
> [pi4]
> hdmi_group=2
> hdmi_mode=11
> armstub=armstub8-gic.bin
>
> freebsd@fbsd13:~ % grep -r "1366x768" /boot/msdos/
> Binary file /boot/msdos/start_cd.elf matches
> Binary file /boot/msdos/start_db.elf matches
> Binary file /boot/msdos/start_x.elf matches
> Binary file /boot/msdos/start.elf matches
> Binary file /boot/msdos/start4.elf matches
> Binary file /boot/msdos/start4cd.elf matches
> Binary file /boot/msdos/start4db.elf matches
> Binary file /boot/msdos/start4x.elf matches
>
> Using the same images with 13.0-RELEASE and 14.0-CURRENT this issue does
> not occur in RPi 4B. Anyone encountered this issue? I confirmed this as
> well with another new RPi 3B hardware and it behaves the same. Please see
> attached dmesg log output for reference.
>
> Okay, I got this working now with the following HDMI config.txt
adjustment. I just indicated the :0 which means the first HDMI interface in
group and mode settings. So, the configuration from

hdmi_group=2
hdmi_mode=11

becomes

hdmi_group:0=2
hdmi_mode:0=11

Tested using 14.0-CURRENT.

freebsd@generic:~ % uname -a
FreeBSD generic 14.0-CURRENT FreeBSD 14.0-CURRENT #0
main-n253384-45c23c2608e: Thu Feb 24 09:18:58 UTC 2022
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC
arm64

Reference:
https://www.raspberrypi.com/documentation/computers/config_txt.html

Thanks,
Archimedes