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board/raspberrypi/readme.txt: reword overlays note

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Any Raspberry Pi may use device-tree overlays; it is not restricted to
Raspberry Pi 3 and 4.

The defconfigs for the Raspberry Pi 3, 4, 400, Zero W, Zero 2 W, Compute
Module 4 and 4s use the miniuart-bt dtoverlay to switch the Bluetooth to
the mini-UART (ttyS0) and restore UART0 (ttyAMA0) over GPIOs 14 and 15
to enable the serial console (like the Raspberry Pi 1 and 2 that have no
Bluetooth)[1][2].

As a consequence, the Raspberry Pi Zero W, Zero 2 W, 400, Compute Module
4 and 4s install the device-tree overlays as well.

This rewords the note by adding the three missing hardwares installing
the images/rpi-firmware/overlays directory. It rewords the miniuart note
at the same time.

[1]: https://www.raspberrypi.com/documentation/computers/configuration.html#uarts-and-device-tree
[2]: https://github.com/raspberrypi/linux/blob/rpi-6.6.y/arch/arm/boot/dts/overlays/miniuart-bt-overlay.dts#L4-L6

Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit is contained in:
Gaël PORTAY
2025-04-15 17:31:23 +02:00
committed by Julien Olivain
parent c7ea55f040
commit a642bed09a
1 changed files with 5 additions and 4 deletions
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9
board/raspberrypi/readme.txt
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@@ -131,10 +131,11 @@ After building, you should obtain this tree:
Pi 4, 400, 5 and the Compute Module 4, 4s and 5 load the second stage
bootloader from a SPI flash EEPROM.
[3] Only for the Raspberry Pi 3/4 Models (overlay miniuart-bt is needed
to enable the RPi3 serial console otherwise occupied by the bluetooth
chip). Alternative would be to disable the serial console in cmdline.txt
and /etc/inittab.
[3] Only for the Raspberry Pi installing device-tree overlays. The Raspberry Pi
with Bluetooth connectivity (Zero W, Zero 2 W, 3, 4, 400, Compute Module 4
and 4s) use the miniuart-bt overlay to enable UART0 for the serial console;
the Bluetooth uses the mini-UART instead. Alternative would be to disable
the serial console in cmdline.txt and /etc/inittab.
How to write the SD card
========================