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No serial console on CM4 (5.19) #5182

Open

juergh opened this issue Sep 27, 2022 · 4 comments

Contributor

juergh commented Sep 27, 2022

Describe the bug

With current rpi-5.19.y there is no serial console on a CM4 unless commandline option 8250.nr_uarts=1 is added explicitly. This seems to have been introduced by commit b9e6232.

Steps to reproduce the behaviour

Boot kernel built from rpi-5.19.y branch.

Device (s)

Raspberry Pi CM4

System

rpi-5.19.y

Logs

[    1.866359] bcm2708_fb soc:fb: Unable to determine number of FBs. Disabling driver.
[    1.866390] bcm2708_fb: probe of soc:fb failed with error -2
[    1.937327] bcm2835-aux-uart fe215040.serial: there is not valid maps for state default
[    1.937663] bcm2835-aux-uart fe215040.serial: error -ENOSPC: unable to register 8250 port
[    1.937701] bcm2835-aux-uart: probe of fe215040.serial failed with error -28
[    1.939472] iproc-rng200 fe104000.rng: hwrng registered
[    1.939896] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)

Additional context

No response

The text was updated successfully, but these errors were encountered:

Contributor Author

juergh commented Sep 27, 2022

See PR #5183.

Contributor

pelwell commented Sep 27, 2022

You're right - CM4 and CM4S are both wrong, in opposite directions. CM4S is like CM3 in that it should be using UART0 as the console UART, and yet it includes 8250.nr_uarts=1 in its bootargs (partial command line), while as you've seen CM4 selects UART1 for the console but is missing 8250.nr_uarts=1. I'll fix the CM4S bootargs so everything is consistent.

(But the fact that 8250.nr_uarts=1 is necessary in the first place in the Device Tree-equipped 21st century is absurd).

pelwell added a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

ed40d79

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Contributor

pelwell commented Sep 27, 2022

See ed40d79 for the companion patch (which will be forward-ported to the newer branches).

pelwell added a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

6b7655d

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

pelwell added a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

e8f12e6

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Contributor

pelwell commented Sep 27, 2022

It should all be done now.

herrnst pushed a commit to herrnst/linux-raspberrypi that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

70f8fac

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: raspberrypi#5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

fb7c89c

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

2ac9aad

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix added a commit to raspberrypi/firmware that referenced this issue


          kernel: Bump to 5.15.72

c18d9a5

kernel: media: i2c: imx477: Allow dynamic horizontal blanking control
See: raspberrypi/linux#5194

kernel: bcm2835-codec: Allow encoder cmds on ISP resize and deinterlace
See: raspberrypi/linux#5197

kernel: ARM: dts: Don't enable the 8250 UART on CM4S
See: raspberrypi/linux#5182

kernel: overlays: Add rpi-sense-v2

popcornmix added a commit to raspberrypi/rpi-firmware that referenced this issue


          kernel: Bump to 5.15.72

61aa555

kernel: media: i2c: imx477: Allow dynamic horizontal blanking control
See: raspberrypi/linux#5194

kernel: bcm2835-codec: Allow encoder cmds on ISP resize and deinterlace
See: raspberrypi/linux#5197

kernel: ARM: dts: Don't enable the 8250 UART on CM4S
See: raspberrypi/linux#5182

kernel: overlays: Add rpi-sense-v2

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

984eaf7

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

5bd4472

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

herrnst pushed a commit to herrnst/linux-raspberrypi that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

64cd77f

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: raspberrypi#5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

herrnst pushed a commit to herrnst/linux-raspberrypi that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

116a6cf

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: raspberrypi#5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

9c4028e

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

popcornmix pushed a commit that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

87bf78b

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: #5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

lsahn-gh pushed a commit to lsahn-org/ubuntu-raspi that referenced this issue


          ARM: dts: Don't enable the 8250 UART on CM4S

5f7c1be

CM4S (like CM3, but unlike some CM4) has no Bluetooth, so don't enable
the 8250 support in the kernel.

See: raspberrypi/linux#5182

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
(cherry picked from commit 6b7655d030686fb16799774f2944c6f2e4a8b803 rpi-5.19.y)
Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>

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