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| author | Andre Przywara <andre.przywara@arm.com> | 2020-03-11 15:18:03 +0000 |
|---|---|---|
| committer | Andre Przywara <andre.przywara@arm.com> | 2020-03-17 13:44:55 +0000 |
| commit | 9cc3fa1b8ae31c18fd3a6070b782b3384590523e (patch) | |
| tree | 48cee2fee944d1c2bd262b4785258eb7630c4187 /plat/rpi/rpi4 | |
| parent | 29e8c460664c88dc3834813d94785fbf6e27b8d1 (diff) | |
| download | arm-trusted-firmware-9cc3fa1b8ae31c18fd3a6070b782b3384590523e.tar.gz | |
rpi: console: Autodetect Mini-UART vs. PL011 configuration
The Raspberry Pi has two different UART devices pin-muxed to GPIO 14&15:
One ARM PL011 one and the 8250 compatible "Mini-UART".
A dtoverlay parameter in config.txt will tell the firmware to switch
between the two: it will setup the right clocks and will configure the
pinmuxes accordingly.
To autodetect the user's choice, we read the pinmux register and check
its setting: ALT5 (0x2) means the Mini-UART is used, ALT0 (0x4) points
to the PL011.
Based on that we select the UART driver to initialise.
This will allow console output in any case.
Change-Id: I620d3ce68de6c6576599f2a405636020e1fd1376
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Diffstat (limited to 'plat/rpi/rpi4')
| -rw-r--r-- | plat/rpi/rpi4/platform.mk | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/plat/rpi/rpi4/platform.mk b/plat/rpi/rpi4/platform.mk index 28fcda8b0..49e78dfed 100644 --- a/plat/rpi/rpi4/platform.mk +++ b/plat/rpi/rpi4/platform.mk @@ -21,6 +21,9 @@ BL31_SOURCES += lib/cpus/aarch64/cortex_a72.S \ drivers/arm/gic/common/gic_common.c \ drivers/arm/gic/v2/gicv2_helpers.c \ drivers/arm/gic/v2/gicv2_main.c \ + drivers/delay_timer/delay_timer.c \ + drivers/gpio/gpio.c \ + drivers/rpi3/gpio/rpi3_gpio.c \ plat/common/plat_gicv2.c \ plat/rpi/rpi4/rpi4_bl31_setup.c \ plat/rpi/common/rpi3_pm.c \ |