Re: [PATCH] RPi: Enable serial console on RPi 4 B

[Natalia Tasci <nt@ilbers.de>]

Hi Felix,

On 4/7/25 18:39, MOESSBAUER, Felix wrote:
> On Mon, 2025-04-07 at 16:47 +0200, Natalia Tasci wrote:
>> Tested with Raspbian Linux 12, baud rate of 115200 bps, 500 lines
>> kernel
>> log.
> I thought about this as well. We should also consider switching the
> RPi4b target over to EFI, as done here:
> https://github.com/siemens/mtda/commit/37b0349f59b1c608727907c771f047fb72003fa8
>
> By that, things like the kernel cmdline can be done by the imager and
> no longer need to come from bsp packages. This would also easily enable
> the use of mount-by-uuid to support USB boot and SD boot at the same
> time.

Thanks for the input. Doing this by the imager sounds reasonable. We 
could consider the improvement after release.

With kind regards,

Natalia



> Felix
>
>> Signed-off-by: Natalia Tasci <nt@ilbers.de>
>> ---
>>   meta-isar/recipes-bsp/bootconfig-rpi/files/config.txt | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/meta-isar/recipes-bsp/bootconfig-rpi/files/config.txt
>> b/meta-isar/recipes-bsp/bootconfig-rpi/files/config.txt
>> index 417d53f1..6d742f27 100644
>> --- a/meta-isar/recipes-bsp/bootconfig-rpi/files/config.txt
>> +++ b/meta-isar/recipes-bsp/bootconfig-rpi/files/config.txt
>> @@ -1,5 +1,11 @@
>>   [pi3]
>>   # Restore UART0/ttyAMA0 over GPIOs 14 & 15
>> +# On RPi 3, using mini UART for serial console is unstable.
>> +# 1/3 boots produce garbage and doesn't reach login
>>   dtoverlay=miniuart-bt
>>   
>> +[pi4]
>> +# Enable mini UART (UART1/ttyS0) for serial console for RPi 4
>> +enable_uart=1
>> +
>>   [all]
>> -- 
>> 2.39.5

-- 
Natalia Tasci
ilbers GmbH
Maria-Merian-Str. 8
D-85521, Ottobrunn
+49 (89) 122 67 24-2
http://ilbers.de/
Amtsgericht München, HRB 214197
Geschäftsführer: Baurzhan Ismagulov

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