How is it not a bug when the kernel fails to boot when you use the default setting?

There is a workaround for this problem which is to limit memory, but there is still a crash. The Raspbian kernel doesn't crash -- it works. That would suggest there is a problem here.

JW

-----Original Message-----
From: <email address hidden> <email address hidden> On Behalf Of Kyle Nitzsche
Sent: Friday, September 25, 2020 2:54 PM
To: Jonathan Watson <email address hidden>
Subject: [Bug 1889223] Re: vc4-kms-v3d boot failure focal armhf preinstalled server

- - - external message, proceed with caution - - -


OK, so you are saying it is really not a kernel fix but is rather an enablement file change/config. thanks.

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Title:
  vc4-kms-v3d boot failure focal armhf preinstalled server

Status in linux-raspi package in Ubuntu:
  Invalid
Status in linux-raspi source package in Focal:
  Triaged

Bug description:
  Booting 20.04 armhf preinstalled-server on Pi3b+ with vc4-kms-v3d
  selected [1] causes boot failure with [2] output on UART. Further
  system info in [3]

  Side note: Booting with the same usercfg.txt but with the 18.04 vc4
  -kms-v3d.dtbo file "works": the boot is normal without the errors
  shown in [2].

  [1]

  ubuntu@ubuntu:~$ cat /boot/firmware/usercfg.txt
  # Place "config.txt" changes (dtparam, dtoverlay, disable_overscan, etc.) in
  # this file. Please refer to the README file for a description of the various
  # configuration files on the boot partition.
  dtoverlay=vc4-kms-v3d

  [2]

    Starting kernel ...

  [    0.039873] cma: CMA area linux,cma could not be activated
  [    0.043189] DMA: failed to allocate 1024 KiB pool for atomic coherent
  allocation
  [    0.308022] kobject_add_internal failed for 3e513000.framebuffer with
  -EEXIST, don't try to register things with the s.
  [    1.141370] kvm [1]: Error, CPU 0 not supported!
  [    1.235565] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 0 config (-12 80)
  [    1.236723] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 1 config (-12 81)
  [    1.237882] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 2 config (-12 82)
  [    1.239014] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 3 config (-12 83)
  [    1.240139] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 4 config (-12 84)
  [    1.241263] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 5 config (-12 85)
  [    1.242412] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 6 config (-12 86)
  [    1.243526] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 7 config (-12 87)
  [    1.831440] spi-bcm2835 3f204000.spi: could not get clk: -517
  [    1.849256] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 2 config (-12 82)
  [    1.850523] raspberrypi-exp-gpio soc:firmware:expgpio: Failed to get
  GPIO 2 config (-12 82)
  [    1.852205] bcm2835_vchiq 3f00b840.mailbox: could not allocate DMA memory
  [    2.369653] spi-bcm2835 3f204000.spi: cannot prepare fill_tx_desc -
  not using DMA mode
  [    2.412710] sdhost: failed to allocate log buf
  ext4

  [3]

  ubuntu@ubuntu:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 20.04.1 LTS
  Release:      20.04
  Codename:     focal

  ubuntu@ubuntu:~$ uname -a
  Linux ubuntu 5.4.0-1015-raspi #15-Ubuntu SMP Fri Jul 10 05:37:25 UTC 2020 armv7l armv7l armv7l GNU/Linux

  Initial part of lshw:
  ubuntu
      description: ARMv7 Processor rev 4 (v7l)
      product: Raspberry Pi 3 Model B Plus Rev 1.3
      serial: 0000000092021ecd
      width: 32 bits
      capabilities: smp

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