Re: Raspberry Pi 3B Distorted U-boot Display

On Mon, Feb 28, 2022 at 4:51 PM Archimedes Gaviola <
[email protected]> wrote:

>
>
> On Sat, Feb 26, 2022 at 11:49 AM Archimedes Gaviola <
> [email protected]> 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 ([email protected]: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
> [email protected]:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC
> arm64
>
> Reference:
> https://www.raspberrypi.com/documentation/computers/config_txt.html
>
>
In addition though booting the firmware and loading U-boot is very very
slow, still this works in 13.0-RELEASE however the [pi3] label must be
indicated otherwise it has no effect.

[pi3]
hdmi_group:0=2
hdmi_mode:0=11

This is for documentation purposes only.

Thanks,
Archimedes