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brcm2708: restore UART on RPi 0W, 3B, 3B+ and 4B

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Disable Bluetooth and restore UART to GPIOs 14 & 15.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Álvaro Fernández Rojas 2019-09-03 13:01:50 +02:00
parent fbbb4eb8b4
commit 5287ac2dfb
4 changed files with 27 additions and 0 deletions
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1
target/linux/brcm2708/image/Makefile
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@ -28,6 +28,7 @@ define Build/boot-common
mcopy -i $@.boot $(KDIR)/LICENCE.broadcom ::
mcopy -i $@.boot cmdline.txt ::
mcopy -i $@.boot $(BOOT_CONFIG) ::config.txt
mcopy -i $@.boot distroconfig.txt ::
mcopy -i $@.boot $(IMAGE_KERNEL) ::$(KERNEL_IMG)
$(foreach dts,$(shell echo $(DEVICE_DTS)),mcopy -i $@.boot $(DTS_DIR)/$(dts).dtb ::;)
mmd -i $@.boot ::/overlays

6
target/linux/brcm2708/image/config-bcm2711-arm64.txt
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@ -9,3 +9,9 @@
# Force aarch64
arm_64bit=1
# OpenWrt config
include distroconfig.txt
[all]
# Place your custom settings here.

6
target/linux/brcm2708/image/config.txt
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@ -6,3 +6,9 @@
# For overclocking and various other settings, see:
# https://www.raspberrypi.org/documentation/configuration/config-txt/README.md
################################################################################
# OpenWrt config
include distroconfig.txt
[all]
# Place your custom settings here.

14
target/linux/brcm2708/image/distroconfig.txt Normal file
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@ -0,0 +1,14 @@
################################################################################
# Bootloader configuration - distroconfig.txt
################################################################################
# Restore PL011 (ttyAMA0) to GPIOs 14 & 15, instead of Mini UART (ttyS0).
# Mini UART is disabled by default unless "enable_uart=1" is specified,
# which changes the core frequency to a fixed value and impacts performance.
# See https://www.raspberrypi.org/documentation/configuration/uart.md
[pi0w]
dtoverlay=disable-bt
[pi3]
dtoverlay=disable-bt
[pi4]
dtoverlay=disable-bt