About KDehm

KDehm · 2022-03-30

Dear community,I once again need your help. :)I'm using a TAS5760L on a custom board with STM32MP157 MPU and Yocto-Linux, Dunfell.Since the codec is not part of the available Linux kernel audio codecs, a simple spdif-codec (inux,spdif-dit) with I2S s...

KDehm · 2021-11-15

Hi,I'm using a Wifi/BT module with CYW4343W chip on a custom board with STM32MP157.When booting the system, the driver is loaded correctly and dmesg log shows[ 1.089865] 4000e000.serial: ttySTM1 at MMIO 0x4000e000 (irq = 24, base_baud = 6250000) i...

KDehm · 2021-09-29

Hi,We want to use a KSZ8851SNL SPI ethernet phy as second eth interface on a custom board. The implementation was according to https://www.kernel.org/doc/Documentation/devicetree/bindings/net/micrel%2Cks8851.yamlThe eth0 interface is initialised with...

KDehm · 2020-09-29

Hi,I'm using a custom board with custom device tree, the distribution is built with ST's Distribution Package (st-image-core). Now the bootloader (u-boot v2020.01) freezes while "starting kernel" with some strange errors before. Should I search for e...

KDehm · 2020-09-15

Hi, I'm trying to build a Yocto-Linux for an specific STM32MP157 board. I was working with "thud", but now "dunfell" is required, as it is supposed to be long term stable.The system is built after ST's manual:https://wiki.st.com/stm32mpu/wiki/How_to_...

KDehm · 2022-04-20

Thank you @Kevin HUBER for your answer.Meanwhile I solved the problem. I could now clearly determine the cause of the "underrun" and have found a solution. There are no more glitches in the audio stream.Problem was actually the sample rate conversio...

KDehm · 2021-11-15

Addendum:Here is the output of /proc/tty/:~# cat /proc/tty/driver/stm32-usart serinfo:1.0 driver revision: 0: uart:stm32-usart mmio:0x40010000 irq:25 tx:19716 rx:983 RTS|CTS|DTR|DSR|CD 1: uart:stm32-usart mmio:0x4000E000 irq:24 tx:32688 rx:2621 RTS|C...

KDehm · 2021-09-30

I could partly solve the problem by editing the kernel driver module for ks8851 (ks8851.c). The problem was caused by defining interrupt type. I changed the level interrupt to falling edge interrupt. Not sure, if this is the proper way. But since the...

KDehm · 2021-09-30

Hi, thanks for your reply. That could be the problem when using EXTI controller.What about using GIC interrupt controller? Could you give me an example on how to configure PE1 as interrupt Pin for spi2 interface?I was thinking the following code is i...

KDehm · 2020-09-29

Thanks for the reply!I checked u-boot in DEBUG-mode, but there is not that much additional information:board_key_check: no /config node? get_led: could not find u-boot,boot-led config stringU-Boot is working just fine (beside some DT-errors), the com...

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Audio Codec configuration for 44100Hz sample rate on STM32MP1 - difficulties with Bluetooth Audio Streaming

Bluetooth tty instance not showing up in /dev/tty*

SPI Ethernet Interface using KSZ8851 - Failed to define Interrupt

STM32MP1 u-boot v2020 freezes while "starting kernel" - custom board and DT

Get stuck in TF-A boot - BL2: Failed to load image - STM32MP1

Re: Audio Codec configuration for 44100Hz sample rate on STM32MP1 - difficulties with Bluetooth Audio Streaming

Re: Bluetooth tty instance not showing up in /dev/tty*

Re: SPI Ethernet Interface using KSZ8851 - Failed to define Interrupt

Re: SPI Ethernet Interface using KSZ8851 - Failed to define Interrupt

Re: STM32MP1 u-boot v2020 freezes while "starting kernel" - custom board and DT