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A
Artem
Visitor II
August 9, 2020
Question

Boot to v5.4-stm32mp-r1

  • August 9, 2020
  • 2 replies
  • 1908 views

Hello,

has anyone successful booted linux  v5.4-stm32mp-r1 on the stm32mp157c-dk2 board?

If so can you please provide me a working config?

I am trying to switch from the 4.19 kernel to v5.4-stm32mp-r1 but the boards freezes after trying to load the kernel without any output, until it gets restarted by the WDG.

I have tried to use TF-A and also U-Boot as SPL, both with the same results.

Kernel 4.19 and also stock 5.7 are booting just fine... The kernel configs are also the same.

U-Boot SPL 2020.01-stm32mp-r1 (Aug 09 2020 - 23:04:31 +0200)
Model: STMicroelectronics STM32MP157C-DK2 Discovery Board
RAM: DDR3-DDR3L 16bits 533000Khz
WDT: Started with servicing (32s timeout)
Trying to boot from MMC1
 
 
U-Boot 2020.01-stm32mp-r1 (Aug 09 2020 - 23:04:31 +0200)
 
CPU: STM32MP157CAC Rev.B
Model: STMicroelectronics STM32MP157C-DK2 Discovery Board
Board: stm32mp1 in basic mode (st,stm32mp157c-dk2)
Board: MB1272 Var2.0 Rev.C-01
DRAM: 512 MiB
Clocks:
- MPU : 650 MHz
- MCU : 208.878 MHz
- AXI : 266.500 MHz
- PER : 24 MHz
- DDR : 533 MHz
WDT: Started with servicing (32s timeout)
NAND: 0 MiB
MMC: STM32 SD/MMC: 0, STM32 SD/MMC: 1
In: serial
Out: serial
Err: serial
****************************************************
* WARNING 500mA power supply detected *
* Current too low, use a 3A power supply! *
****************************************************
 
Net: eth0: ethernet@5800a000
Hit any key to stop autoboot: 0
Boot over mmc0!
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:4...
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
131 bytes read in 35 ms (2.9 KiB/s)
1: stm32mp157c-dk2-buildroot
Retrieving file: /boot/zImage
3986960 bytes read in 203 ms (18.7 MiB/s)
append: root=/dev/mmcblk0p4 rootwait
Retrieving file: /boot/stm32mp157c-dk2.dtb
105200 bytes read in 40 ms (2.5 MiB/s)
## Flattened Device Tree blob at c4000000
 Booting using the fdt blob at 0xc4000000
 Loading Device Tree to cffe3000, end cffffaef ... OK
 
Starting kernel ...

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    2 replies

    F
    Fee
    Visitor II
    August 10, 2020

    Hi,

    had the same problem as well:

    https://community.st.com/s/question/0D53W00000CO2JOSA1/problems-booting-with-uboot-in-ecosystem-20-using-the-trusted-bootchain

    For me using the .config file of the released kernel (not the one on the ST Github, I am talking about the on eyou can get here: https://wiki.st.com/stm32mpu/wiki/STM32MP1_Developer_Package#Downloading_the_Linux_kernel) fixed the problem.

    Hope it helps.

    A
    ArtemAuthor
    Visitor II
    August 10, 2020

    Hello,

    ok, now I have also extracted the config from the "released" kernel, but it still not boot. Have you applied any patches?

    F
    Fee
    Visitor II
    August 10, 2020

    Yes i applied the config fragments according to the README (till including step 5).

    A
    ArtemAuthor
    Visitor II
    August 10, 2020

    Ok, I got it working now:

    I have extracted and patched the kernel like explained in the README. Then I have generated the config with all fragments - also like explained in the README (till fragment 5 too). Now I have copied over the full config to buildroot and was able to compile the v5.4-stm32mp-r1 kernel from github.

    The kernel now boots when using TF-A but not U-Boot SPL, but this is fine for me.

    It would be good to know what piece of config is preventing the kernel from booting...

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