About JOhn1

JOhn1 · 2024-01-10

We are currently experiencing a major issue with eMMC on our custom boards using STM32MP153CAC. Our boards are booting normally with 1 wire mode, but as soon as 8 wire/bit mode is enabled, it starts to bug out.Here is the description of the problem f...

JOhn1 · 2022-09-16

When I'm working on configuring devicetree for a new board, adding new nodes and tweaking values, I often run into a un-bootable system. What I would like is that there is a bit more information of what goes wrong.Like now it just quits booting if so...

JOhn1 · 2022-08-31

Hello we are using STM32mp153 for multiple products, and I'm considering buiding a generic TF-A bootloader with one device tree with all the clocks enabled for all the peripherals. I would like to do this in order to make it more generic across our p...

JOhn1 · 2022-07-27

Problem: After configuring the OTP pins in word 3 to the following:- Primary boot source : SD-card- Secondary boot source : FMC NANDAnd flashing the FMC nand with TF-A `tfa-*-nand.stm32` in the first sector using `nandwrite -p /dev/mtd0 /mnt/boot/tf-...

JOhn1 · 2022-06-28

Hi, Is there any way to give a more meaningful name to a serial port with the device tree, so that is shows up in the linux kernel?Right now, in a device tree, it is possible to choose an alias in the alias node. But they do show up as ttySTMx in th...

JOhn1 · 2024-01-11

@PatrickF wrote:Hi,I see HSE at 12MHz whereas it should be 24MHz. did you really use 12MHz and define it like that in DT ?I see also your AXI is running at 54MHz (instead of up to 266MHz) and the DDR (PLL2) at 216MHz (instead of up to 533MHz). This w...

JOhn1 · 2024-01-10

Our signal path lengths are 27 mm from pad to pad.Perhaps our drive strenght is too much or what when at these shorter distances?

JOhn1 · 2024-01-10

@PatrickF wrote:Hi @JOhn1 ,27 MHz whereas 52MHz requested might depend on which combination the driver has found be not be above the 52MHz. Could you please share clock summary. cat /sys/kernel/debug/clk/clk_summary Clock Summary output is attached.@...

JOhn1 · 2024-01-10

Only series resistor on EMMC_CLK line. (See attached photo below)We read this out from our kernel:clock: 52000000 Hz actual clock: 27000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 3...

JOhn1 · 2022-09-04

Basically if possible, I would like to reeuse the TF-a for different products. This is so that specialization can happen at the linux devicetree level, saving efforts when adapting new products. We have a large portfolio of products we are migrating ...

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Major issue with eMMC 8 bit

Workflow improvment

Enabling all clocks TF-A, what could go wrong?

Urgent: Cannot boot from NAND - OTP

aliasing serial ports to names like (rs232, etc.)

Re: Major issue with eMMC 8 bit

Re: Major issue with eMMC 8 bit

Re: Major issue with eMMC 8 bit

Re: Major issue with eMMC 8 bit

Re: Enabling all clocks TF-A, what could go wrong?